A circularly polarized microwave Doppler detection device and detection method

Abstract

The present invention provides a circularly polarized microwave Doppler detection device and a detection method. The circularly polarized microwave Doppler detection device is configured to emit at least one circularly polarized detection beam to a detection space in a circularly polarized manner, reverse the rotation of a circularly polarized echo, and receive a circularly polarized reverse-rotated echo, and output a difference signal corresponding to the difference in characteristic parameters between the circularly polarized detection beam and the circularly polarized reverse-rotated echo based on the Doppler effect principle. The circularly polarized detection beam is reflected by an object in the detection space to form the circularly polarized echo, and the circularly polarized echo is reverse-rotated in a reflective manner to form the circularly polarized reverse-rotated echo, that is, the circularly polarized reverse-rotated echo has the same rotation direction as the circularly polarized detection beam and is allowed to be received by the circularly polarized microwave Doppler detection device. Then, the difference signal corresponds to the movement of the corresponding object in the detection space.

Description

Technical Field

[0001] The present invention relates to the field of Doppler microwave detection, and particularly to a circularly polarized microwave Doppler detection device and a detection method. Background Art

[0002] Wireless communication technology, as an important symbol of modern scientific development, has developed rapidly since its birth and has been widely used in production, life and military, such as satellite communication systems, satellite navigation systems, remote control systems and daily RFID identification systems. Among them, electromagnetic waves, as the carrier of information, have index characteristics such as radiation directivity and polarization. Specifically, electromagnetic waves can choose different polarization modes when propagating in space. Polarization refers to the direction of the electric field vector of the antenna in space when it radiates electromagnetic waves. Common polarization modes include circular polarization (including elliptical polarization) and linear polarization. Among them, linearly polarized electromagnetic waves refer to electromagnetic waves that vibrate back and forth on a straight line and propagate forward. Circularly polarized or elliptically polarized electromagnetic waves refer to electromagnetic waves that rotate along a circular or elliptical path around the propagation direction and propagate forward.

[0003] A circularly polarized electromagnetic wave can be decomposed into two linearly polarized electromagnetic waves with equal amplitudes that are orthogonal to each other both in space and time. Any elliptically polarized electromagnetic wave can be decomposed into two circularly polarized electromagnetic waves with opposite rotation directions, namely left-handed and right-handed circularly polarized electromagnetic waves. Correspondingly, circularly polarized transmitters and receivers for transmitting and receiving circularly polarized electromagnetic waves have orthogonality of rotation direction, that is: a left-handed circularly polarized transmitter and a right-handed circularly polarized receiver are not compatible. A left-handed circularly polarized receiver can only receive left-handed circularly polarized electromagnetic waves, while a right-handed circularly polarized receiver can only receive right-handed circularly polarized electromagnetic waves and cannot receive left-handed circularly polarized electromagnetic waves. In particular, by different combination methods, two out-of-phase circularly polarized electromagnetic waves can be synthesized into any polarized electromagnetic wave. Among them, linearly polarized electromagnetic waves, as a special case, can be expressed as a pair of out-of-phase circularly polarized electromagnetic waves with equal amplitudes and opposite rotation directions. Therefore, all linearly polarized electromagnetic waves can be received by circularly polarized receivers, and vice versa, circularly polarized incoming waves can also be received by linearly polarized receivers. Due to the good reception performance of circularly polarized electromagnetic waves, circularly polarized electromagnetic waves are usually used in the fields of electronic countermeasures such as electronic reconnaissance, tracking and interference, and the communication field.

[0004] When a circularly polarized electromagnetic wave is incident on the surface of symmetric targets such as a plane and a spherical surface, the polarization direction of the reflected electromagnetic wave is opposite to that of the incident wave. That is to say, when a left-handed circularly polarized electromagnetic wave emitted by a left-handed circularly polarized transmitter is incident on the surface of symmetric targets such as a plane and a spherical surface, the reflected wave will be radiated with reverse polarization and become a right-handed circularly polarized electromagnetic wave. Based on this characteristic of circularly polarized electromagnetic waves, communication using circularly polarized electromagnetic waves as information carriers has excellent performance in suppressing interference caused by rain and fog. Therefore, circularly polarized electromagnetic wave transmitters are further widely used in satellite communication systems, satellite navigation systems, remote control systems, meteorological radar systems, electronic reconnaissance and electronic jamming systems. However, also restricted by this characteristic of circularly polarized electromagnetic waves, current Doppler microwave detection devices that detect the movement of objects based on the Doppler effect principle of electromagnetic waves and adopt an integrated design of a transmitter and a receiver are considered unable to use circularly polarized electromagnetic waves. Therefore, current Doppler microwave detection devices that detect the movement of objects based on the Doppler effect principle of electromagnetic waves and adopt an integrated design of a transmitter and a receiver generally use a linear polarization method. Correspondingly, because current Doppler microwave detection devices generally use a linear polarization method, it is difficult to increase the detection range, and they have weak anti-attenuation characteristics and anti-rain-and-fog interference capabilities. That is to say, the detection range of current Doppler microwave detection devices is small and difficult to further increase, and the stability and accuracy of signal reception are also poor, making it difficult to meet the high-accuracy requirements for detecting moving objects. Summary of the Invention

[0005] An object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method, wherein the circularly polarized microwave Doppler detection device detects the movement of an object using circularly polarized electromagnetic waves based on the Doppler effect principle, improves the anti-attenuation characteristics and anti-rain-and-fog interference capabilities of the circularly polarized microwave Doppler detection device, and is conducive to meeting the high-accuracy requirements for detecting moving objects and adapting to outdoor detection scenarios.

[0006] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method, wherein the circularly polarized microwave Doppler detection device is configured to emit at least one circularly polarized detection beam to a detection space in a circularly polarized manner, and reverse the polarization of a circularly polarized echo, and receive a circularly polarized reverse echo, and output a difference signal based on the Doppler effect principle according to the characteristic difference between the circularly polarized detection beam and the circularly polarized reverse echo, wherein the circularly polarized detection beam is reflected by an object in the detection space to form the circularly polarized echo, and the circularly polarized echo is reversed in polarization by the circularly polarized microwave Doppler detection device in a reflected manner to form the circularly polarized reverse echo, that is, the circularly polarized reverse echo has the same polarization direction as the circularly polarized detection beam and is allowed to be received by the circularly polarized microwave Doppler detection device, then the difference signal corresponds to the movement of the corresponding object in the detection space.

[0007] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method, wherein the circularly polarized microwave Doppler detection device includes at least one electromagnetic reflector to reverse the circularly polarized echo based on the reflection of the circularly polarized echo by the electromagnetic reflector, so that the circularly polarized detection beam and the circularly polarized reversed echo have the same sense of rotation.

[0008] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method, wherein the circularly polarized microwave Doppler detection device includes at least one circularly polarized radiation source, and the circularly polarized radiation source is arranged to be fed and polarized in a circularly polarized manner, so that the circularly polarized microwave Doppler detection device can emit at least one circularly polarized detection beam to the detection space in a circularly polarized manner.

[0009] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method, wherein the circularly polarized microwave Doppler detection device includes at least one oscillation unit and a mixing and detection unit, the oscillation unit is electrically connected to the circularly polarized radiation source, and the mixing and detection unit is electrically coupled to the oscillation unit and the circularly polarized radiation source and is arranged to output the difference signal corresponding to the characteristic difference between the circularly polarized detection beam and the circularly polarized reversed echo based on the Doppler effect principle.

[0010] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method, wherein based on the sense-of-rotation orthogonality of the circularly polarized microwave Doppler detection device, in the difference signal corresponding to the movement of the corresponding object, the interference to the difference signal caused by the reflection of circularly polarized electromagnetic waves by other objects between the circularly polarized radiation source and the corresponding object and between the corresponding object and the electromagnetic reflector can be suppressed, improving the anti-multipath reflection ability of the circularly polarized microwave Doppler detection device and being beneficial to improving the correlation degree and accuracy of the feedback of the difference signal to the movement of the corresponding object.

[0011] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method, wherein based on the sense-of-rotation orthogonality of the circularly polarized microwave Doppler detection device, in the difference signal corresponding to the movement of the corresponding object, the correlation degree of the feedback of the difference signal to the movement of the corresponding object is improved, which is beneficial to simplifying the data analysis and processing of the difference signal.

[0012] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method, wherein the correlation degree and accuracy of the feedback of the differential signal to the movement of the corresponding object are improved, the detection accuracy of the circularly polarized microwave Doppler detection device is correspondingly improved, which is beneficial to improving the detection accuracy of the circularly polarized microwave Doppler detection device for weak movements, so that the circularly polarized microwave Doppler detection device is applicable to the detection of subtle movements such as human body movement, micro-movement, breathing and heartbeat, and is applied to human presence detection.

[0013] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method, wherein the circularly polarized radiation source is arranged in the form of a sheet-shaped conductive layer and is equivalently provided with two electrical feeding points, the connection line of the two electrical feeding points of the circularly polarized radiation source passes through the physical center point of the circularly polarized radiation source, and the circularly polarized radiation source is reversely double-fed by applying a first excitation signal and a second excitation signal opposite in phase to the first excitation signal to the two electrical feeding points of each circularly polarized radiation source respectively, so as to form a zero potential point of the circularly polarized radiation source at the physical center point of the circularly polarized radiation source in the state where the circularly polarized radiation source is reversely double-fed, which is beneficial to suppressing the polarization balance mismatch caused by the shape design and processing error of the circularly polarized radiation source, and further improving the radiation efficiency of the circularly polarized microwave Doppler detection device in a way of balancing and ensuring the potential distribution intensity of the circularly polarized radiation source in the fed state, and correspondingly improving the accuracy of the circularly polarized microwave Doppler detection device.

[0014] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method, wherein in the state where the connection line of the two electrical feeding points of the circularly polarized radiation source passes through the physical center point of the circularly polarized radiation source, based on the design of the corresponding matching network connected to the two electrical feeding points, a zero potential point of the circularly polarized radiation source can be formed at the physical center point of the circularly polarized radiation source in the state where the circularly polarized radiation source is reversely double-fed. That is to say, the reverse state of the first excitation signal and the second excitation signal corresponds to the distribution of the first excitation signal and the second excitation signal with the zero point of a cycle of the excitation signal as the boundary, without restricting the absolute amplitudes of the first excitation signal and the second excitation signal to be the same. That is, in the state where the connection line of the two electrical feeding points of the circularly polarized radiation source passes through the physical center point of the circularly polarized radiation source, the two electrical feeding points are not restricted to be symmetric about the physical center point of the circularly polarized radiation source, and based on the design of the corresponding matching network, a zero potential point of the circularly polarized radiation source can be formed at the physical center point of the circularly polarized radiation source in the state where the circularly polarized radiation source is reversely double-fed. Therefore, the circuit design of the corresponding circularly polarized microwave Doppler detection device is flexible and diverse and can adapt to different layout requirements.

[0015] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method, wherein the midpoint of the connection line between the two electrical feeding points of the circularly polarized radiation source is located at the physical center point of the circularly polarized radiation source, that is, in a state where the connection line between the two electrical feeding points of the circularly polarized radiation source passes through the physical center point of the circularly polarized radiation source, the two electrical feeding points are symmetric with respect to the physical center point of the circularly polarized radiation source. This is beneficial to simplify the design of the corresponding matching network, and in a state where the circularly polarized radiation source is fed with opposite-phase double feeding, ensure that the zero-potential point of the circularly polarized radiation source is formed at the physical center point of the circularly polarized radiation source, thereby being beneficial to further suppressing the polarization balance mismatch caused by the shape design and processing error of the circularly polarized radiation source, and further improving the radiation efficiency of the circularly polarized microwave Doppler detection device in a manner of balancing and ensuring the potential distribution intensity of the circularly polarized radiation source in the fed state, and correspondingly improving the accuracy of the circularly polarized microwave Doppler detection device.

[0016] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method, wherein the circularly polarized radiation source is arranged to be symmetric about the connection line between the two electrical feeding points. In this way, in a state where the circularly polarized radiation source is fed with opposite-phase double feeding, the polarization balance mismatch caused by the shape design of the circularly polarized radiation source is further suppressed, and further, the radiation efficiency of the circularly polarized microwave Doppler detection device is improved in a manner of balancing and ensuring the potential distribution intensity of the circularly polarized radiation source in the fed state, and correspondingly, the accuracy of the circularly polarized microwave Doppler detection device is improved.

[0017] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method, wherein the oscillation unit is arranged to be powered and output the first excitation signal and the second excitation signal that is in antiphase with the first excitation signal through the matching network with the positive electrode or the ground electrode of the corresponding power supply as the reference ground electrode. In a state where each circularly polarized radiation source is fed with opposite-phase double feeding by accessing the first excitation signal at one of the electrical feeding points and accessing the second excitation signal at the other electrical feeding point respectively, each circularly polarized radiation source is electrically connected to the reference ground electrode and grounded at the physical center point of the circularly polarized radiation source. In this way, closed-loop circuits for the first excitation signal and the second excitation signal are respectively formed between the two electrical feeding points of the circularly polarized radiation source and the physical center point of the circularly polarized radiation source, thereby reducing the impedance of the circularly polarized microwave Doppler detection device at frequencies deviating from the resonant working point, correspondingly narrowing the bandwidth of the circularly polarized microwave Doppler detection device, and being beneficial to improving the anti-interference performance of the circularly polarized microwave Doppler detection device.

[0018] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method. In a state where the circularly polarized radiation source is fed in antiphase, based on the potential distribution relationship with the physical center point of the circularly polarized radiation source being the zero potential point of the circularly polarized radiation source, by electrically connecting the physical center point of the circularly polarized radiation source to the reference ground electrode, the potential distribution of the circularly polarized radiation source can be maintained, thereby maintaining the radiation efficiency of the circularly polarized microwave Doppler detection device. That is, based on the structural design that the circularly polarized radiation source is symmetric about the line connecting the two electrical feeding points and the midpoint of the line connecting the two electrical feeding points is located at the physical center point of the circularly polarized radiation source, the electrical connection between the physical center point of the circularly polarized radiation source and the reference ground electrode can avoid energy loss caused by physical short - circuit and maintain the radiation efficiency of the circularly polarized microwave Doppler detection device, and at the same time improve the anti - interference performance of the circularly polarized microwave Doppler detection device.

[0019] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method. The circularly polarized microwave Doppler detection device includes a ground plane, and each circularly polarized radiation source is spaced from the ground plane. In a state where the circularly polarized radiation source is fed in antiphase, the ground plane is connected to the reference ground electrode, and each circularly polarized radiation source is electrically connected to the ground plane through a metallized via structure at the physical center point of the circularly polarized radiation source, so as to form a relationship in which the circularly polarized radiation source is electrically connected to the reference ground electrode at the physical center point. Thus, it is simple and easy to implement and will not cause congestion in the circuit layout, which is beneficial to improving the anti - interference performance of the antiphase - fed microwave detection module and its adaptability to the current miniaturization trend.

[0020] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method. In a state where the circularly polarized radiation source is fed in antiphase, based on the potential distribution relationship with the physical center point of the circularly polarized radiation source being the zero potential point of the circularly polarized radiation source, by electrically connecting the physical center point of the circularly polarized radiation source to the reference ground electrode, the excitation electric field generated by the circularly polarized radiation source is in a symmetric and balanced distribution state, so that the back lobes and side lobes formed by the polarization balance mismatch based on the circularly polarized radiation source in the corresponding microwave beam can be suppressed, which is beneficial to optimizing the front - to - back ratio of the circularly polarized microwave Doppler detection device, and improving the anti - interference ability of the circularly polarized microwave Doppler detection device in the backward and lateral directions while increasing the gain of the circularly polarized microwave Doppler detection device.

[0021] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method. In a state where the circularly polarized radiation source is fed in antiphase, based on the potential distribution relationship with the physical center point of the circularly polarized radiation source as the zero potential point of the circularly polarized radiation source, by electrically connecting the physical center point of the circularly polarized radiation source to the reference ground electrode, the excitation electric field generated by the circularly polarized radiation source is symmetrically and evenly distributed, which is beneficial to reducing the insertion loss of the circularly polarized microwave Doppler detection device and increasing the gain of the circularly polarized microwave Doppler detection device. Correspondingly, the size requirement for the ground plane is reduced. That is, under the same gain performance requirement for the circularly polarized microwave Doppler detection device, the size of the ground plane can be reduced while ensuring the gain of the circularly polarized microwave Doppler detection device, thus facilitating the miniaturization design of the circularly polarized microwave Doppler detection device.

[0022] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method, in which the radiation efficiency and anti-interference performance of the circularly polarized microwave Doppler detection device are simultaneously improved. Correspondingly, the detection accuracy of the circularly polarized microwave Doppler detection device is improved, which is beneficial to improving the detection accuracy of the circularly polarized microwave Doppler detection device for weak movements, so that the circularly polarized microwave Doppler detection device is applicable to the detection of weak movements such as human body movement, micro-movement, breathing, and heartbeat, and is applied to human presence detection.

[0023] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method, in which the description of the position of the electrical feeding point is a limitation on the electrical equivalent feeding position of the circularly polarized radiation source. The physical feeding implementation structures of the electrical feeding points are diverse, and the physical feeding structures corresponding to the two electrical feeding points of the same circularly polarized radiation source are not restricted to be the same. Therefore, the circuit design of the corresponding circularly polarized microwave Doppler detection device is flexible and diverse and can adapt to different layout requirements.

[0024] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method. Based on the structural design that the circularly polarized radiation source is symmetric about the line connecting the two electrical feeding points, and the midpoint of the line connecting the two electrical feeding points is located at the physical center point of the circularly polarized radiation source, the access relationship between the two electrical feeding points to the first excitation signal and the second excitation signal can be reciprocal. Taking the electrical feeding point accessing the first excitation signal as an example, in the state of the corresponding point feeding (probe feeding) structure of this electrical feeding point, when the circularly polarized radiation source is applied with the first excitation signal connected at a feeding connection point deviating from the physical center point of the circularly polarized radiation source on the circularly polarized radiation source, the electrical feeding point takes the feeding connection point. And when the circularly polarized radiation source is applied with the first excitation signal connected at two feeding connection points deviating from the physical center point of the circularly polarized radiation source on the circularly polarized radiation source, the electrical equivalent feeding point of the circularly polarized radiation source is located at the midpoint of the line connecting the two feeding connection points, that is, the electrical feeding point takes the midpoint of the line connecting the two feeding connection points, and the positional relationship between the two feeding connection points is set to satisfy that the midline of the line connecting the two feeding connection points passes through the physical center point of the circularly polarized radiation source. That is, in the state of the corresponding point feeding (probe feeding) structure of the electrical feeding point, the description of the electrical connection relationship and position of the electrical feeding point is a limitation on the electrical connection relationship of the physical feeding connection point and the electrical equivalent feeding position of the circularly polarized radiation source. The specific number and position of the feeding connection points are flexible and variable, so the circuit design of the circularly polarized microwave Doppler detection device is flexible and diverse and can adapt to different layout requirements.

[0025] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method. In the state of the corresponding microstrip feeding structure of the electrical feeding point, the circularly polarized radiation source is connected to the first excitation signal or the second excitation signal through a microstrip feeding line. The electrical feeding point is electrically equivalent to the point on the circularly polarized radiation source electrically connected to the microstrip feeding line. That is, the description of the electrical connection relationship and position of the electrical feeding point corresponds to the limitation on the electrical connection relationship and position of the point on the circularly polarized radiation source electrically connected to the microstrip feeding line. The physical feeding structures corresponding to the electrical feeding points are diverse, and the physical feeding structures corresponding to the two electrical feeding points of the same circularly polarized radiation source are not limited to be the same. Therefore, the circuit design of the circularly polarized microwave Doppler detection device is flexible and diverse and can adapt to different layout requirements.

[0026] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method. In a state where the electrical feeding point corresponds to the side feeding structure, the circularly polarized radiation source is connected to the first excitation signal or the second excitation signal through a side feeder. The side feeder is a microstrip line adjacent to and parallel to the straight side of the circularly polarized radiation source. The electrical equivalent feeding point of the circularly polarized radiation source is electrically equivalent to the midpoint of the side feeder set as a microstrip line. That is, the description of the electrical connection relationship and position of the electrical feeding point is a limitation on the electrical connection relationship of the physical side feeder and the midpoint position of the side feeder. The specific position where the side feeder is connected to the first excitation signal or the second excitation signal is not limited and does not affect the limitation on the position of the electrical feeding point. Therefore, the circuit design of the corresponding circularly polarized microwave Doppler detection device is flexible and diverse and can adapt to different layout requirements.

[0027] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method. Based on the reflection mechanism of electromagnetic waves, the characteristic parameters of the size and shape of the electromagnetic reflection plate correspond to a target space defined by the circularly polarized echo that can be counter-rotated and received in the form of the circularly polarized counter-rotated echo in the detection space. That is, the target space corresponds to the detection range of the movement of an object in the detection space. By adjusting the characteristic parameters of the size and shape of the electromagnetic reflection plate, the target space can be adjusted to accurately set the detection range of the movement of an object in the detection space. Compared with the existing Doppler microwave detection device, it breaks through the limitation that it is difficult to adjust the microwave coverage boundary to set the detection range of the movement of the corresponding object, which is beneficial to improving the applicability of the circularly polarized microwave Doppler detection device.

[0028] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method. By adjusting the position of the electromagnetic reflection plate relative to the circularly polarized radiation source, the target space can be adjusted to set the detection range of the movement of an object in the detection space, which is beneficial to improving the applicability of the circularly polarized microwave Doppler detection device.

[0029] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method. By adjusting the distance and angle of the electromagnetic reflection plate relative to the circularly polarized radiation source, the position of the electromagnetic reflection plate relative to the circularly polarized radiation source can be adjusted to adjust the target space and set the detection range of the movement of an object in the detection space, which is beneficial to improving the applicability of the circularly polarized microwave Doppler detection device.

[0030] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method, wherein the circularly polarized microwave Doppler detection device includes at least one electromagnetic restriction dam, and the electromagnetic restriction dam is disposed on the transmission path of the circularly polarized counter-rotating echo to the circularly polarized radiation source between the circularly polarized radiation source and the electromagnetic reflector, so as to further set the detection range of the movement of the corresponding object in the target space by the restriction effect of the electromagnetic restriction dam on the transmission path of the circularly polarized counter-rotating echo.

[0031] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method, wherein the electromagnetic restriction dam is configured to restrict the transmission of the circularly polarized counter-rotating echo to the circularly polarized radiation source in a manner of attenuation and / or blocking on the transmission path of the circularly polarized counter-rotating echo, so as to adjust the reception degree and range of the circularly polarized radiation source for the circularly polarized counter-rotating echo, thereby further setting the detection range of the movement of the object in the detection space in the target space.

[0032] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method, wherein by adjusting the characteristic parameters of the size and shape of the electromagnetic restriction dam, the reception degree and range of the circularly polarized radiation source for the circularly polarized counter-rotating echo can be adjusted, thereby further setting the detection range of the movement of the corresponding object in the target space.

[0033] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method, wherein by adjusting the position of the electromagnetic restriction dam between the circularly polarized radiation source and the electromagnetic reflector, the reception degree and range of the circularly polarized radiation source for the circularly polarized counter-rotating echo can be adjusted, thereby further setting the detection range of the movement of the corresponding object in the target space.

[0034] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method, wherein by adjusting the direction, angle and distance of the electromagnetic restriction dam relative to the circularly polarized radiation source between the circularly polarized radiation source and the electromagnetic reflector, the position of the electromagnetic restriction dam between the circularly polarized radiation source and the electromagnetic reflector can be adjusted to further set the detection range of the movement of the corresponding object in the target space.

[0035] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method, wherein by adjusting the electromagnetic reflector and the electromagnetic restriction dam, the detection range of the movement of the object in the detection space of the circularly polarized microwave Doppler detection device can be accurately set.

[0036] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method, wherein by adjusting the electromagnetic reflector and / or the electromagnetic dam, the detection range of the circularly polarized microwave Doppler detection device for the movement of an object in the detection space can be set by angle and / or regionally.

[0037] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method, wherein by adjusting the electromagnetic reflector and / or the electromagnetic dam in real time, the detection range of the circularly polarized microwave Doppler detection device for the movement of an object in the detection space can be set in real time by angle and / or regionally, which is conducive to realizing the positioning detection of the corresponding moving object.

[0038] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method, wherein the detection range of the circularly polarized microwave Doppler detection device for the movement of an object in the detection space can be set by angle and / or regionally, which is conducive to the application of the circularly polarized microwave Doppler detection device in a specific range of detection, such as detecting a corresponding moving object in a precise small range, or detecting a corresponding moving object in different local spaces of the same place.

[0039] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method, wherein the detection range of the circularly polarized microwave Doppler detection device for the movement of an object in the detection space can be set and adjusted in real time by angle and / or regionally. When the circularly polarized microwave Doppler detection device is applied to the presence of a human body, based on the detection of human movement, micro-movement, breathing / heartbeat by angle and / or regionally, the circularly polarized microwave Doppler detection device is suitable for intelligent control applications based on human activities in different scenarios.

[0040] Another object of the present invention is to provide a circularly polarized microwave Doppler detection device and a detection method, wherein when the circularly polarized radiation source is set to achieve circularly polarized radiation with a multi-point feeding structure, based on the mixing and detection of the signals of the corresponding feeding circuits, the detection ranges corresponding to different polarization intervals can be detected separately.

[0041] According to one aspect of the present invention, the present invention provides a circularly polarized microwave Doppler detection device, which is based on the Doppler effect principle for detecting moving objects, wherein the circularly polarized microwave Doppler detection device includes:

[0042] An oscillation unit, wherein the oscillation unit is set to be powered and output at least one excitation signal with the positive pole or the ground pole of the corresponding power supply as the reference ground pole;

[0043] A circularly polarized radiation source, wherein the circularly polarized radiation source is fed and connected to the oscillation unit and is circularly polarized, so as to access the excitation signal when the oscillation unit is powered and emit at least one circularly polarized detection beam in a circularly polarized manner to a detection space;

[0044] An electromagnetic reflector, wherein the electromagnetic reflector is arranged on the transmission path of the corresponding circularly polarized echo to reflect the corresponding circularly polarized echo in a reverse rotation manner to form a circularly polarized reverse rotation echo transmitted to the circularly polarized radiation source, wherein the circularly polarized echo is an echo formed by the circularly polarized detection beam being reflected by a corresponding object in the detection space; and

[0045] A mixing and detection unit, wherein the mixing and detection unit is electrically coupled to the oscillation unit and the circularly polarized radiation source to output a difference signal corresponding to the difference in characteristic parameters between the circularly polarized detection beam and the circularly polarized reverse rotation echo, and the difference signal corresponds to the movement of the corresponding object in the detection space.

[0046] In an embodiment, the circularly polarized radiation source is arranged in the form of a sheet-shaped conductive layer and adopts a multi-feed structure and has a plurality of electrical feed points, wherein each of the electrical feed points is arranged on the circularly polarized radiation source at an equal distance from the physical center point of the circularly polarized radiation source, and the circularly polarized radiation source is fed with phase-shifted power by the oscillation unit at the electrical feed points with a corresponding phase difference and has a circularly polarized state.

[0047] In an embodiment, the circularly polarized radiation source adopts a multi-feed structure with dual feeds and has two electrical feed points, wherein the connection lines between the two electrical feed points and the physical center point of the circularly polarized radiation source are perpendicular to each other, and the oscillation unit is arranged in a powered state to feed the circularly polarized radiation source 10 with two excitation signals having a 90° phase difference at the two electrical feed points to achieve the circular polarization setting of the circularly polarized radiation source 10.

[0048] In an embodiment, the circularly polarized radiation source has three or more electrical feed points, and each of the electrical feed points is arranged on the circularly polarized radiation source at an equal distance from the physical center point of the circularly polarized radiation source and is equidistantly arranged around the physical center point of the circularly polarized radiation source.

[0049] In an embodiment, the circularly polarized radiation source has three electrical feed points, wherein the connection lines between adjacent electrical feed points and the physical center point of the circularly polarized radiation source form an angle of 120°, and the oscillation unit is arranged in a powered state to feed the circularly polarized radiation source with three excitation signals having a 120° phase difference in sequence at the three electrical feed points to achieve the circular polarization setting of the circularly polarized radiation source.

[0050] In one embodiment, the circularly polarized radiation source has four electrical feeding points, and the lines connecting adjacent electrical feeding points to the physical center point of the circularly polarized radiation source form a 90° angle. The oscillation unit is set in a powered state to feed the circularly polarized radiation source with four-way excitation signals having a 90° phase difference in sequence at the four electrical feeding points, thereby realizing the circular polarization setting of the circularly polarized radiation source.

[0051] In one embodiment, the circularly polarized radiation source has six electrical feeding points, and the lines connecting adjacent electrical feeding points to the physical center point of the circularly polarized radiation source form a 60° angle. The oscillation unit is set in a powered state to feed the circularly polarized radiation source with six-way excitation signals having a 60° phase difference in sequence at the six electrical feeding points, thereby realizing the circular polarization setting of the circularly polarized radiation source.

[0052] In one embodiment, the circularly polarized radiation source has eight electrical feeding points, and the lines connecting adjacent electrical feeding points to the physical center point of the circularly polarized radiation source form a 45° angle. The oscillation unit is set in a powered state to feed the circularly polarized radiation source with eight-way excitation signals having a 45° phase difference in sequence at the eight electrical feeding points, thereby realizing the circular polarization setting of the circularly polarized radiation source.

[0053] In one embodiment, the circularly polarized radiation source is provided with a regular shape having linear symmetry.

[0054] In one embodiment, the electrical feeding points are arranged in a point feeding structure, and corresponding to the circularly polarized radiation source, they are fed and connected to the oscillation unit at corresponding numbers of feeding connection points, and are phase-shifted and fed by the oscillation unit with corresponding phase differences.

[0055] In one embodiment, the circularly polarized microwave Doppler detection device further includes feeding posts corresponding to the number of feeding connection points. One end of the feeding post is electrically fixed to the circularly polarized radiation source at the feeding connection point, and the other end of the feeding post is fed and connected to the oscillation unit to form a feeding connection between the circularly polarized radiation source and the oscillation unit through the feeding post at the feeding connection point.

[0056] In one embodiment, one side of the circularly polarized radiation source corresponding to the electromagnetic reflector is fixedly arranged on a solid medium, and the feeding post is arranged as a conductive structure formed on the solid medium by a metallized via process.

[0057] In one embodiment, at least one of the electrical feeding points is arranged in an edge feeding structure, and the circularly polarized radiation source is connected to the excitation signal of the corresponding path through an edge feeder. The edge feeder is a microstrip line adjacent to and parallel to the straight edge of the circularly polarized radiation source, and the corresponding electrical equivalent feeding point of the circularly polarized radiation source is electrically equivalent to be located at the midpoint of the edge feeder arranged as a microstrip line.

[0058] In one embodiment, at least one of the electrical feeding points is arranged in a microstrip feeding structure, and the circularly polarized radiation source is connected to the excitation signal of the corresponding path through a microstrip feeding line. The corresponding electrical feeding point of the circularly polarized radiation source is electrically equivalent to be located at the point on the circularly polarized radiation source that is electrically connected to the microstrip feeding line.

[0059] In one embodiment, in the state where the oscillation unit is powered, the circularly polarized radiation source is electrically connected to the reference ground electrode and grounded.

[0060] In one embodiment, the circularly polarized radiation source adopts a single-feed structure and has an electrical feeding point and at least one degenerate mode separation unit. The circularly polarized microwave Doppler detection device further includes a ground plane. The circularly polarized radiation source and the ground plane are arranged at intervals. The electrical feeding point is arranged deviating from the physical center of the circularly polarized radiation source. The degenerate mode separation unit is integrally formed on the circularly polarized radiation source. The circularly polarized radiation source is fed and connected to the oscillation unit at the electrical feeding point. When the circularly polarized radiation source accesses the excitation signal at the electrical feeding point and is fed by the oscillation unit, the circularly polarized radiation source can generate two degenerate modes with orthogonal polarizations. The degenerate mode separation unit is used to separate the resonant frequencies of the two degenerate modes with orthogonal polarizations to form a 90° phase difference between the two orthogonal degenerate modes. In this way, when the circularly polarized radiation source is fed by the oscillation unit at the electrical feeding point, the circularly polarized radiation source emits the circularly polarized detection beam in a circularly polarized manner.

[0061] In one embodiment, the circularly polarized microwave Doppler detection device further includes a radiation source substrate and a ground plane substrate. The radiation source substrate and the ground plane substrate are arranged at intervals. The circularly polarized radiation source is arranged on one side of the radiation source substrate corresponding to the ground plane substrate, and the ground plane is arranged on one side of the ground plane substrate corresponding to the radiation source substrate.

[0062] In one embodiment, the electrical feeding point is arranged in a point feeding structure and is equivalent to be located at a feeding connection point on the circularly polarized radiation source. The circularly polarized radiation source is fed and connected to the oscillation unit at the feeding connection point.

[0063] In one embodiment, the circularly polarized microwave Doppler detection device further includes a feeding column, wherein the feeding column is electrically fixed to the circularly polarized radiation source at the feeding connection point and is fixed to the ground plane substrate, so that the circularly polarized radiation source is fixedly supported by the feeding column and is spaced from the ground plane, and the radiation source substrate is supported and fixed to the circularly polarized radiation source and is spaced from the ground plane substrate.

[0064] In one embodiment, the feeding column is disconnected from the ground plane substrate and extends to the side of the ground plane substrate opposite to the side where the ground plane is provided, and the oscillation unit is arranged on the side of the ground plane substrate opposite to the side where the ground plane is provided and is fed and connected to the feeding column.

[0065] In one embodiment, the electrical feeding point is arranged in an edge feeding structure, and the circularly polarized radiation source is connected to the excitation signal through an edge feeder. The edge feeder is a microstrip line adjacent to and parallel to the straight edge of the circularly polarized radiation source, and the electrical equivalent feeding point is electrically equivalent to the midpoint of the edge feeder set as the microstrip line.

[0066] In one embodiment, the electrical feeding point is arranged in a microstrip feeding structure, and the circularly polarized radiation source is connected to the excitation signal through a microstrip feeder. The electrical feeding point is electrically equivalent to the point on the circularly polarized radiation source that is electrically connected to the microstrip feeder.

[0067] In one embodiment, the circularly polarized radiation source has a grounding point, which is the physical center point of the circularly polarized radiation source. The circularly polarized radiation source is electrically connected to the reference ground electrode at the grounding point and is grounded.

[0068] In one embodiment, when the oscillation unit is powered, the ground plane is connected to the reference ground electrode, and the circularly polarized radiation source is electrically connected to the ground plane at the grounding point and is grounded.

[0069] In one embodiment, the circularly polarized radiation source is arranged in the form of a sheet-shaped conductive layer and further has another electrical feeding point. The connection line of the two electrical feeding points of the circularly polarized radiation source passes through the physical center point of the circularly polarized radiation source. The oscillation unit is arranged to be powered and outputs a first excitation signal and a second excitation signal that is opposite in phase to the first excitation signal with the positive pole or the ground electrode of the corresponding power supply as the reference ground electrode. The circularly polarized radiation source is arranged to access the first excitation signal at one electrical feeding point and access the second excitation signal at the other electrical feeding point.

[0070] In one embodiment, the midpoint of the line connecting the two electrical feeding points is located at the physical center point of the circularly polarized radiation source, that is, in a state where the line connecting the two electrical feeding points of the circularly polarized radiation source passes through the physical center point of the circularly polarized radiation source, and the two electrical feeding points are symmetric with respect to the physical center point of the circularly polarized radiation source.

[0071] In one embodiment, the electromagnetic reflector extends integrally from the ground plane.

[0072] In one embodiment, the circularly polarized microwave Doppler detection device further includes an electromagnetic limiting dam, and the electromagnetic limiting dam is fixedly disposed between the circularly polarized radiation source and the electromagnetic reflector, so as to limit the transmission of the corresponding circularly polarized reverse echo to the circularly polarized radiation source in a manner of attenuation and / or blocking through the electromagnetic limiting dam on the transmission path of the corresponding circularly polarized reverse echo, thereby adjusting the receiving degree and range of the circularly polarized radiation source for the corresponding circularly polarized reverse echo.

[0073] In one embodiment, the circularly polarized microwave Doppler detection device further includes at least one electromagnetic limiting dam, and the electromagnetic limiting dam is movably disposed between the circularly polarized radiation source and the electromagnetic reflector, so as to limit the transmission of the corresponding circularly polarized reverse echo to the circularly polarized radiation source in a manner of attenuation and / or blocking through the electromagnetic limiting dam on the transmission path of the corresponding circularly polarized reverse echo, thereby adjusting the receiving degree and range of the circularly polarized radiation source for the corresponding circularly polarized reverse echo.

[0074] In one embodiment, the electromagnetic limiting dam is reciprocally movably disposed in the radial direction of the circularly polarized radiation source, and has a dimension corresponding to the distance between the circularly polarized radiation source and the electromagnetic reflector in the direction from the circularly polarized radiation source to the electromagnetic reflector.

[0075] In one embodiment, assuming that the wavelength parameter of the circularly polarized electromagnetic wave corresponding to the frequency parameter of the circularly polarized microwave Doppler detection device is λ, the electromagnetic limiting dam has a dimension greater than or equal to λ / 128 in the direction perpendicular to its movable direction.

[0076] In one embodiment, the electromagnetic limiting dam is reciprocally movably disposed within a distance of 1λ from the circularly polarized radiation source.

[0077] In one embodiment, the electromagnetic limiting dam is reciprocally movably disposed in the direction from the circularly polarized radiation source to the electromagnetic reflector.

[0078] In one embodiment, the electromagnetic limiting dam is reciprocally pivotally disposed in the direction from the circularly polarized radiation source to the electromagnetic reflector.

[0079] In one embodiment, the electromagnetic limiting dam is rotatably disposed around the circularly polarized radiation source between the circularly polarized radiation source and the electromagnetic reflector.

[0080] In one embodiment, the electromagnetic limiting dam is pivotally disposed around an axis perpendicular to the plane where the circularly polarized radiation source is located between the circularly polarized radiation source and the electromagnetic reflector.

[0081] In one embodiment, the pivot axis of the electromagnetic limiting dam is disposed away from the periphery of the circularly polarized radiation source, and an end of the electromagnetic limiting dam away from its pivot axis is bent and extends on the electromagnetic limiting dam and has a curvature corresponding to the periphery of the circularly polarized radiation source, so that when the electromagnetic limiting dam is pivotally adjusted, the end of the electromagnetic limiting dam having a curvature corresponding to the periphery of the circularly polarized radiation source can approach and move away from the periphery of the circularly polarized radiation source in a translational movement manner within a certain distance range.

[0082] In one embodiment, in a state where the oscillation unit is powered, the circularly polarized radiation source is electrically connected to the reference ground electrode and grounded.

[0083] In one embodiment, the circularly polarized radiation source has a grounding point, where the grounding point is the physical center point of the circularly polarized radiation source, and the circularly polarized radiation source is electrically connected to the reference ground electrode and grounded at the grounding point.

[0084] In one embodiment, the electromagnetic reflector is movably disposed in the radial direction of the circularly polarized radiation source.

[0085] In one embodiment, the electromagnetic reflector is rotatably disposed around the circularly polarized radiation source.

[0086] In one embodiment, the electromagnetic reflector is disposed on a flexible substrate, and by virtue of the flexible characteristics of the flexible substrate, the position of the electromagnetic reflector relative to the circularly polarized radiation source is adjusted by adjusting the flexible substrate in a movable manner.

[0087] According to another aspect of the present invention, the present invention further provides a detection method for a circularly polarized microwave Doppler detection device, and the detection method includes the following steps:

[0088] A. Emitting at least one circularly polarized detection beam to a detection space in a circularly polarized manner, where the circularly polarized detection beam is reflected by an object in the detection space to form a circularly polarized echo;

[0089] B. Reverse-rotate the circularly polarized echo, where the circularly polarized echo is reverse-rotated in a reflective manner to form a circularly polarized reverse-rotated echo;

[0090] C. Receive the circularly polarized reverse-rotated echo; and

[0091] D. Output the difference signal, where the difference signal corresponds to the difference in characteristic parameters between the circularly polarized detection beam and the circularly polarized reverse-rotated echo.

[0092] In one embodiment, the circularly polarized microwave Doppler detection device is provided with a circularly polarized radiation source and an electromagnetic reflector. In step (B), the corresponding circularly polarized echo is reverse-rotated by the electromagnetic reflector in a reflective manner to form the circularly polarized reverse-rotated echo transmitted towards the circularly polarized radiation source.

[0093] In one embodiment, in step (B), it further includes the step of actively adjusting the electromagnetic reflector.

[0094] In one embodiment, the circularly polarized microwave Doppler detection device is provided with at least one electromagnetic dam. In step (C), the electromagnetic dam adjusts the receiving degree and range of the circularly polarized radiation source for the corresponding circularly polarized reverse-rotated echo in a manner of attenuation and / or reflection in the transmission path of the circularly polarized reverse-rotated echo formed by reflection by the electromagnetic reflector and transmitted towards the circularly polarized radiation source.

[0095] In one embodiment, it further includes the step of actively adjusting the electromagnetic dam.

[0096] In one embodiment, the circularly polarized microwave Doppler detection device is provided with a mixing and detection unit. In step (D), the mixing and detection unit outputs the difference signal based on the frequency difference between the circularly polarized detection beam and the circularly polarized reverse-rotated echo. BRIEF DESCRIPTION OF THE DRAWINGS

[0097] Figure 1 It is a schematic side cross-sectional structure diagram of a circularly polarized microwave Doppler detection device according to an embodiment of the present invention.

[0098] Figure 2 It is a schematic diagram of the principle of the circularly polarized microwave Doppler detection device for detecting the movement of an object according to the above embodiment of the present invention.

[0099] Figure 3A It is a schematic structure diagram of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to the above embodiment of the present invention.

[0100] Figure 3BSchematic diagram of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to the above embodiments of the present invention.

[0101] Figure 3C Schematic diagram of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to the above embodiments of the present invention.

[0102] Figure 3D Schematic diagram of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to the above embodiments of the present invention.

[0103] Figure 3E Schematic diagram of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to the above embodiments of the present invention.

[0104] Figure 3F Schematic diagram of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to the above embodiments of the present invention.

[0105] Figure 3G Schematic diagram of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to the above embodiments of the present invention.

[0106] Figure 3H Schematic diagram of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to the above embodiments of the present invention.

[0107] Figure 3I Schematic diagram of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to the above embodiments of the present invention.

[0108] Figure 3J Schematic diagram of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to the above embodiments of the present invention.

[0109] Figure 3K Schematic diagram of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to the above embodiments of the present invention.

[0110] Figure 4A Optimized schematic diagram of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to the above embodiments of the present invention.

[0111] Figure 4B Optimized schematic diagram of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to the above embodiments of the present invention.

[0112] Figure 4CSchematic diagram of the optimized structure of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to the above embodiments of the present invention.

[0113] Figure 4D Schematic diagram of the optimized structure of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to the above embodiments of the present invention.

[0114] Figure 4E Schematic diagram of the optimized structure of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to the above embodiments of the present invention.

[0115] Figure 4F Schematic diagram of the optimized structure of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to the above embodiments of the present invention.

[0116] Figure 4G Schematic diagram of the optimized structure of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to the above embodiments of the present invention.

[0117] Figure 4H Schematic diagram of the optimized structure of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to the above embodiments of the present invention.

[0118] Figure 4I Schematic diagram of the optimized structure of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to the above embodiments of the present invention.

[0119] Figure 4J Schematic diagram of the optimized structure of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to the above embodiments of the present invention.

[0120] Figure 4K Schematic diagram of the optimized structure of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to the above embodiments of the present invention.

[0121] Figure 5 Schematic diagram of the structure of the circularly polarized microwave Doppler detection device according to a variant embodiment of the above embodiments of the present invention.

[0122] Figure 6 Schematic diagram of the structure of the circularly polarized microwave Doppler detection device according to a variant embodiment of the above embodiments of the present invention.

[0123] Figure 7A Schematic diagram of the side cross-sectional structure of the circularly polarized microwave Doppler detection device according to a variant embodiment of the above embodiments of the present invention.

[0124] Figure 7BSchematic structural diagram of the circularly polarized microwave Doppler detection device according to the above deformation embodiment of the present invention.

[0125] Figure 8A Schematic side-sectional structural diagram of an optimized structure of the circularly polarized microwave Doppler detection device according to the above embodiment of the present invention.

[0126] Figure 8B Schematic structural diagram of the optimized structure of the circularly polarized microwave Doppler detection device according to the above embodiment of the present invention.

[0127] Figure 9 Schematic side-sectional structural diagram of an optimized structure of the circularly polarized microwave Doppler detection device according to the above embodiment of the present invention.

[0128] Figure 10A Schematic side-sectional structural diagram of an optimized structure of the circularly polarized microwave Doppler detection device according to the above embodiment of the present invention.

[0129] Figure 10B Schematic side-sectional structural diagram of an optimized structure of the circularly polarized microwave Doppler detection device according to the above embodiment of the present invention.

[0130] Figure 10C Schematic side-sectional structural diagram of an optimized structure of the circularly polarized microwave Doppler detection device according to the above embodiment of the present invention.

[0131] Figure 11A Schematic three-dimensional structural diagram of an optimized structure of the circularly polarized microwave Doppler detection device according to the above embodiment of the present invention.

[0132] Figure 11B Schematic diagram of the optimized structure of the circularly polarized microwave Doppler detection device according to the above embodiment of the present invention.

[0133] Figure 12A Schematic three-dimensional structural diagram of an optimized structure of the circularly polarized microwave Doppler detection device according to a deformation embodiment of the above embodiment of the present invention.

[0134] Figure 12B Schematic diagram of the optimized structure of the circularly polarized microwave Doppler detection device according to the above deformation embodiment of the present invention.

[0135] Figure 13A Schematic three-dimensional structural diagram of an optimized structure of the circularly polarized microwave Doppler detection device according to the above deformation embodiment of the present invention.

[0136] Figure 13BSchematic diagram of the optimized structure of the circularly polarized microwave Doppler detection device according to the above-described variant embodiment of the present invention.

[0137] Figure 14A Schematic perspective view of an optimized structure of the circularly polarized microwave Doppler detection device according to the above-described variant embodiment of the present invention.

[0138] Figure 14B Schematic diagram of the optimized structure of the circularly polarized microwave Doppler detection device according to the above-described variant embodiment of the present invention.

[0139] Figure 15A Schematic diagram of the structure of a circularly polarized radiation source of a circularly polarized microwave Doppler detection device according to an embodiment of the present invention.

[0140] Figure 15B Schematic diagram of the structure of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to a variant embodiment of the above-described embodiment of the present invention.

[0141] Figure 15C Schematic diagram of the structure of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to another variant embodiment of the above-described embodiment of the present invention.

[0142] Figure 15D Schematic diagram of the structure of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to another variant embodiment of the above-described embodiment of the present invention.

[0143] Figure 15E Schematic diagram of the structure of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to another variant embodiment of the above-described embodiment of the present invention.

[0144] Figure 15F Schematic diagram of the structure of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to another variant embodiment of the above-described embodiment of the present invention.

[0145] Figure 16 Schematic diagram of the structure of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to another variant embodiment of the above-described embodiment of the present invention.

[0146] Figure 17 Schematic diagram of the structure of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to another variant embodiment of the above-described embodiment of the present invention.

[0147] Figure 18 Schematic diagram of the structure of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to another variant embodiment of the above-described embodiment of the present invention.

[0148] Figure 19 Schematic structural diagram of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to another variant embodiment of the above embodiment of the present invention.

[0149] Figure 20 Schematic structural diagram of a circularly polarized radiation source of the circularly polarized microwave Doppler detection device according to another variant embodiment of the above embodiment of the present invention. Detailed implementation manners

[0150] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and those skilled in the art can think of other obvious variants. The basic principles defined in the following description of the present invention can be applied to other implementation manners, variant schemes, improvement schemes, equivalent schemes, and other technical schemes that do not deviate from the spirit and scope of the present invention.

[0151] Those skilled in the art should understand that in the disclosure of the present invention, the orientation or positional relationship indicated by terms such as "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the present invention.

[0152] It can be understood that the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in other embodiments, the number of the element can be multiple. The term "a" should not be construed as limiting the quantity.

[0153] The present invention discloses a circularly polarized microwave Doppler detection device that uses circularly polarized electromagnetic waves to detect the movement of an object based on the Doppler effect principle. Taking the realization of circular polarization by a single-feed structure as an example, the structure and principle of the circularly polarized microwave Doppler detection device are schematically shown. Specifically, referring to FIGS. Figure 1 and Figure 2 shown, where Figure 1 schematically shows the side cross-sectional structure of the circularly polarized microwave Doppler detection device, where Figure 2Schematically shows the principle of the circularly polarized microwave Doppler detection device for detecting the movement of an object. The circularly polarized microwave Doppler detection device includes a circularly polarized radiation source 10, a ground plane 20, and an electromagnetic reflector 30. The circularly polarized radiation source 10 and the ground plane 20 are spaced apart. The circularly polarized radiation source 10 is arranged to be fed at a single point and circularly polarized. Thus, when the circularly polarized radiation source 10 is fed, the circularly polarized microwave Doppler detection device can emit at least one circularly polarized detection beam in a circularly polarized manner to a detection space on the side of the ground plane 20 facing the circularly polarized radiation source 10. The circularly polarized detection beam is reflected by a corresponding object in the detection space and counter-rotates to form a circularly polarized echo. The electromagnetic reflector 30 is arranged on the transmission path of the corresponding circularly polarized echo and allows the corresponding circularly polarized echo to be reflected by the electromagnetic reflector 30 and transmitted to the circularly polarized radiation source 10. That is, the corresponding circularly polarized echo is reflected by the electromagnetic reflector 30 and counter-rotates to form a circularly polarized counter-rotating echo. The electromagnetic reflector 30 is arranged such that the circularly polarized radiation source 10 is located on the transmission path of the corresponding circularly polarized counter-rotating echo. Thus, the corresponding circularly polarized counter-rotating echo and the circularly polarized detection beam have the same rotation direction and are transmitted to the circularly polarized radiation source 10 and can be received by the circularly polarized radiation source 10. Then, based on the Doppler effect principle, the difference in characteristic parameters between the circularly polarized detection beam and the circularly polarized counter-rotating echo corresponds to the movement of the corresponding object that reflects the circularly polarized detection beam.

[0154] It is worth mentioning that the arrangement of the electromagnetic reflector 30 enables the circularly polarized counter-rotating echo and the circularly polarized detection beam to have the same rotation direction and can be received by the circularly polarized microwave Doppler detection device, breaking through the limitation that the circularly polarized microwave Doppler detection device using circularly polarized electromagnetic waves cannot be applied to the detection of the movement of an object based on the Doppler effect principle of electromagnetic waves with a transceiver-integrated design due to the rotational orthogonality of circularly polarized electromagnetic waves. That is, the circularly polarized microwave Doppler detection device can detect the movement of an object based on the Doppler effect principle of electromagnetic waves and adopt a transceiver-integrated design. At the same time, compared with the existing Doppler microwave detection device, due to the use of circularly polarized electromagnetic waves, the anti-attenuation characteristic and the anti-rain and fog interference ability of the circularly polarized microwave Doppler detection device are improved, which is beneficial to meeting the high-accuracy requirements for the detection of moving objects.

[0155] Further, the circularly polarized microwave Doppler detection device includes at least one oscillation unit and a mixing and detection unit. The oscillation unit is configured to be powered and output a corresponding excitation signal through a corresponding matching network with the positive pole of the corresponding power supply or the ground pole as the reference ground pole. The oscillation unit is fed-connected to the circularly polarized radiation source 10 to feed the circularly polarized radiation source 10 with the excitation signal in the state where the oscillation unit is powered. The mixing and detection unit is electrically coupled to the oscillation unit and the circularly polarized radiation source 10 and is configured to output a difference signal corresponding to the characteristic difference between the circularly polarized detection beam and the circularly polarized counter-rotating echo based on the Doppler effect principle. Then, the difference signal corresponds to the movement of the corresponding object in the detection space.

[0156] It can be understood that based on the circular polarization orthogonality of the circularly polarized microwave Doppler detection device, in the difference signal corresponding to the movement of the corresponding object, the interference to the difference signal caused by the reflection of the circularly polarized electromagnetic wave by other objects between the circularly polarized radiation source 10 and the corresponding object, and between the corresponding object and the electromagnetic reflector 30 can be suppressed, improving the anti-multipath reflection ability of the circularly polarized microwave Doppler detection device, facilitating improving the correlation and accuracy of the feedback of the difference signal to the movement of the corresponding object, corresponding to the improvement of the detection accuracy of the circularly polarized microwave Doppler detection device, facilitating improving the accuracy of the detection of weak movement by the circularly polarized microwave Doppler detection device, so that the circularly polarized microwave Doppler detection device is applicable to the detection of human body movement, micro-movement, breathing and heartbeat-like subtle movements and is applied to human presence detection. And due to the improvement of the correlation of the feedback of the difference signal to the movement of the corresponding object, it is conducive to simplifying the data analysis and processing of the difference signal.

[0157] It is worth mentioning that the feeding structure of the circularly polarized radiation source 10 with a single-feed structure is diverse. Specifically, the circularly polarized radiation source 10 with a single-feed structure has an electrical feeding point 100. In the state of the point feeding (probe feeding) structure corresponding to the electrical feeding point 100, when the circularly polarized radiation source 10 is implemented and an excitation signal is connected through a feeding connection point 101 that deviates from the physical center point of the circularly polarized radiation source 10 on the circularly polarized radiation source 10, the electrical feeding point 100 takes the feeding connection point 101. When the circularly polarized radiation source 10 is implemented and the excitation signal is connected through two feeding connection points 101 that deviate from the physical center point of the circularly polarized radiation source 10 on the circularly polarized radiation source 10, the electrically equivalent feeding point 100 of the circularly polarized radiation source 10 is located at the midpoint of the line connecting the two feeding connection points 101, that is, the electrical feeding point 100 takes the midpoint of the line connecting the two feeding connection points 101, and the positional relationship between the two feeding connection points 101 is set such that the midline of the line connecting the two feeding connection points 101 passes through the physical center point of the circularly polarized radiation source 10. Based on this equivalent relationship, in the state of the point feeding (probe feeding) structure corresponding to the electrical feeding point 100, the specific quantity and position of the feeding connection point 101 corresponding to one electrical feeding point 100 are flexible and variable, and the present invention does not limit this. In the state of the microstrip feeding structure corresponding to the electrical feeding point 100, the circularly polarized radiation source 10 is connected to the excitation signal through a microstrip feeding line, where the electrical feeding point 100 is electrically equivalent to the point on the circularly polarized radiation source 10 that is electrically connected to the microstrip feeding line. In the state of the edge feeding structure corresponding to the electrical feeding point 100, the circularly polarized radiation source 10 is connected to the excitation signal through an edge feeder, where the edge feeder is a microstrip line adjacent to and parallel to the straight edge of the circularly polarized radiation source 10, and the electrically equivalent feeding point 100 of the circularly polarized radiation source 10 is electrically equivalent to the midpoint of the edge feeder that is set as a microstrip line.

[0158] Specifically, referring to the accompanying drawings of the specification of the present invention Figures 3A to 3KAs shown, taking the feeding (probe feeding) structure corresponding to the electrical feeding point 100 as an example, different shapes and structures of the circularly polarized radiation source 10 are schematically shown, where the circularly polarized radiation source 10 is set as a conductive plate with a linearly symmetric regular shape, such as but not limited to square, rectangular, circular, elliptical, isosceles trapezoidal, isosceles triangular, annular, regular polygon, and has one feeding connection point 101 and at least one degenerate mode separation unit 102, where the feeding connection point 101 is set deviating from the physical center of the circularly polarized radiation source 10, where the degenerate mode separation unit 102 is integrally formed on the circularly polarized radiation source 10, where the circularly polarized radiation source 10 is fed and connected to the oscillation unit at the feeding connection point 101, so that when fed by the oscillation unit at the feeding connection point 101, two degenerate modes with orthogonal polarizations can be generated, where the degenerate mode separation unit 102 is set to separate the resonant frequencies of the two degenerate modes with orthogonal polarizations to form a 90° phase difference, so that the circularly polarized radiation source 10 can form circularly polarized radiation when fed by the oscillation unit at the feeding connection point 101.

[0159] It is worth mentioning that the formation of the degenerate mode is an electrical expression of the polarization principle of the circularly polarized radiation source 10, and there is no corresponding physical structure or marking of the illustrated arrow on the circularly polarized radiation source 10.

[0160] It can be understood that in this embodiment of the present invention, the circularly polarized radiation source 10 adopts a single feeding structure with a simple structure, which is beneficial to reducing the cost of the circularly polarized microwave Doppler detection device, and has a narrow working frequency point bandwidth, which is beneficial to further improving the anti-interference performance of the circularly polarized microwave Doppler detection device.

[0161] In particular, in this embodiment of the present invention, when the oscillation unit is powered, the circularly polarized radiation source 10 is electrically connected to the reference ground electrode and grounded, then the quality factor (i.e., Q value) in the working state of the circularly polarized microwave Doppler detection device is improved, which is beneficial to improving the anti-interference performance of the circularly polarized microwave Doppler detection device by narrowing the working frequency point bandwidth of the circularly polarized microwave Doppler detection device.

[0162] Specifically, the circularly polarized radiation source 10 further has a grounding point 103, where the circularly polarized radiation source 10 is grounded at the grounding point 103. Preferably, the grounding point 103 is the physical center point of the circularly polarized radiation source 10. While the circularly polarized radiation source 10 is grounded at the grounding point 103 to reduce the impedance of the circularly polarized microwave Doppler detection device, since in the operating state of the circularly polarized microwave Doppler detection device, the physical center point of the circularly polarized radiation source 10 is at zero potential, the circularly polarized radiation source 10 being grounded at the grounding point 103 can also allow the circularly polarized radiation source 10 to be fed at the feeding connection point 101 for circular polarization.

[0163] Further, in the state where the oscillation unit is powered, the ground plane 20 is connected to the reference ground electrode, and the circularly polarized radiation source 10 is electrically connected to the ground plane 20 at the grounding point 103 to be grounded.

[0164] Further referring to the Figure 1 illustrated in the accompanying drawings of the present invention, in this embodiment of the present invention, the circularly polarized microwave Doppler detection device further includes a radiation source substrate 40, a ground plane substrate 50, and a feeding post 60. The radiation source substrate 40 and the ground plane substrate 50 are disposed at intervals. The circularly polarized radiation source 10 is disposed on one side of the radiation source substrate 40 corresponding to the ground plane substrate 50. The ground plane 20 is disposed on one side of the ground plane substrate 50 corresponding to the radiation source substrate 40. The feeding post 60 is electrically connected to the circularly polarized radiation source 10 at the feeding connection point 101 and is fixed to the ground plane substrate 50, so as to form a state where the circularly polarized radiation source 10 is fixedly supported by the feeding post 60 and is spaced apart from the ground plane 20, and a state where the radiation source substrate 40 is supported and fixed by the circularly polarized radiation source 10 and is spaced apart from the ground plane substrate 50.

[0165] Specifically, the feeding post 60 is disconnected from the ground plane 20 on the ground plane substrate 50 and extends to the side of the ground plane substrate 50 opposite to the side where the ground plane 20 is disposed, so that the oscillation unit can be disposed on the side of the ground plane substrate 50 opposite to the side where the ground plane 20 is disposed and is feeding-connected to the feeding post 60, so as to feed the circularly polarized radiation source 10 at the feeding connection point 101 through the feeding post 60.

[0166] Further, in this embodiment of the present invention, the electromagnetic reflector 30 extends integrally from the ground plane 20 and is fixedly disposed on the ground plane substrate 50 to further simplify the structure of the circularly polarized microwave Doppler detection device. That is to say, in the integrated electromagnetic reflector 30 and the ground plane 20, in the direction perpendicular to the ground plane substrate 50, the projection of the circularly polarized radiation source 10 corresponds to the ground plane 20, and correspondingly, the area outside the projection of the circularly polarized radiation source 10 corresponds to the electromagnetic reflector 30.

[0167] Further, referring to Figures 4A to 4K the drawings of the specification of the present invention, the further optimized structure of the circularly polarized radiation source 10 of the circularly polarized microwave Doppler detection device according to the above embodiment of the present invention is schematically shown. Specifically, the further optimization of the circularly polarized radiation source 10 corresponds to that Figures 3A to 3K on the basis of the structure of the circularly polarized radiation source 10 shown in the figure, the circularly polarized radiation source 10 is further provided with another electrical feeding point 100 in the form of a sheet-shaped conductive layer. The connection line of the two electrical feeding points 100 of the circularly polarized radiation source 10 passes through the physical center point of the circularly polarized radiation source 10. By respectively feeding the circularly polarized radiation source 10 with a first excitation signal and a second excitation signal that is opposite in phase to the first excitation signal at the two electrical feeding points 100 of each circularly polarized radiation source 10, in the state where the circularly polarized radiation source 10 is fed with opposite-phase double feeding, a zero-potential point of the circularly polarized radiation source 10 is formed at the physical center point of the circularly polarized radiation source 10, which is beneficial to suppressing the polarization balance mismatch caused by the shape design and processing error of the circularly polarized radiation source 10, and further improving the radiation efficiency of the circularly polarized microwave Doppler detection device by balancing and ensuring the potential distribution intensity of the circularly polarized radiation source 10 in the fed state, and correspondingly improving the accuracy of the circularly polarized microwave Doppler detection device.

[0168] It can be understood that based on the structural design in which the degenerate mode separation unit 102 is integrally formed on the circularly polarized radiation source 10, the shape and physical center point of the circularly polarized radiation source 10 are determined based on the line-symmetric regular shape of the circularly polarized radiation source 10 without the degenerate mode separation unit 102, such as but not limited to square, rectangle, circle, ellipse, isosceles trapezoid, isosceles triangle, ring, regular polygon.

[0169] It is worth mentioning that in the state where the line connecting the two electrical feeding points 100 of the circularly polarized radiation source 10 passes through the physical center point of the circularly polarized radiation source 10, based on the design of the corresponding matching network electrically connected to the two electrical feeding points 100, a zero potential point of the circularly polarized radiation source 10 can be formed at the physical center point of the circularly polarized radiation source 10 in the state where the circularly polarized radiation source 10 is fed with opposite-phase double feeding. That is to say, the opposite-phase state of the first excitation signal and the second excitation signal corresponds to the distribution of the first excitation signal and the second excitation signal with the zero point of a cycle of the excitation signal as the boundary, without restricting the absolute amplitudes of the first excitation signal and the second excitation signal to be the same. That is, in the state where the line connecting the two electrical feeding points 100 of the circularly polarized radiation source 10 passes through the physical center point of the circularly polarized radiation source 10, the two electrical feeding points 100 are not restricted to be symmetric with respect to the physical center point of the circularly polarized radiation source 10, and based on the design of the corresponding matching network, a zero potential point of the circularly polarized radiation source 10 can be formed at the physical center point of the circularly polarized radiation source 10 in the state where the circularly polarized radiation source 10 is fed with opposite-phase double feeding. Therefore, the circuit design of the corresponding circularly polarized microwave Doppler detection device is flexible and diverse and can adapt to different layout requirements.

[0170] In particular, due to the shape design and processing error of the circularly polarized radiation source 10, in the description of the present invention, the understanding that the line connecting the two electrical feeding points 100 of the circularly polarized radiation source 10 passes through the physical center point of the circularly polarized radiation source 10 should be interpreted as the line connecting one of the electrical feeding points 100, the physical center point of the circularly polarized radiation source 10, and the other electrical feeding point 100 tending to be a straight line with an included angle greater than or equal to 170 degrees at the physical center point of the circularly polarized radiation source 10.

[0171] Furthermore, in the state where the line connecting the two electrical feeding points 100 of the circularly polarized radiation source 10 passes through the physical center point of the circularly polarized radiation source 10, preferably, the midpoint of the line connecting the two electrical feeding points 100 is located at the physical center point of the circularly polarized radiation source 10, that is, in the state where the line connecting the two electrical feeding points 100 of the circularly polarized radiation source 10 passes through the physical center point of the circularly polarized radiation source 10, the two electrical feeding points 100 are symmetric about the physical center point of the circularly polarized radiation source 10, so as to facilitate the simplification of the corresponding matching network design, and in the state where the circularly polarized radiation source 10 is fed with opposite-phase dual feeding, ensure that the zero potential point of the circularly polarized radiation source 10 is formed at the physical center point of the circularly polarized radiation source 10, thereby facilitating the further suppression of the polarization balance mismatch caused by the shape design and processing error of the circularly polarized radiation source 10, and further improving the radiation efficiency of the circularly polarized microwave Doppler detection device in a manner of balancing and ensuring the potential distribution intensity of the circularly polarized radiation source 10 in the fed state, and correspondingly improving the accuracy of the circularly polarized microwave Doppler detection device.

[0172] Preferably, the circularly polarized radiation source 10 is further arranged to be symmetric about the line connecting the two electrical feeding points 100, so as to further suppress the polarization balance mismatch caused by the shape design of the circularly polarized radiation source 10 in the state where the circularly polarized radiation source 10 is fed with opposite-phase dual feeding, and further improve the radiation efficiency of the circularly polarized microwave Doppler detection device in a manner of balancing and ensuring the potential distribution intensity of the circularly polarized radiation source 10 in the fed state, and correspondingly improving the accuracy of the circularly polarized microwave Doppler detection device.

[0173] Furthermore, the oscillation unit is set as a signal source that is allowed to be powered and outputs the first excitation signal and the second excitation signal that is in opposite phase to the first excitation signal with the positive pole or the ground pole of the corresponding power supply as the reference ground pole.

[0174] It can be understood that the oscillation unit outputs the first excitation signal and the second excitation signal respectively at the two electrical feeding points 100 of the circularly polarized radiation source 10 through a corresponding matching network. The design of the matching network to meet the corresponding impedance matching has diverse structural and parameter designs in an actual circuit, including but not limited to the matching network composed of at least one of microstrip lines, inductors, and capacitors. Moreover, the influence of the matching network on the phases of the first excitation signal and the second excitation signal does not change the out-of-phase state of the first excitation signal and the second excitation signal, that is, it does not change the distribution state of the first excitation signal and the second excitation signal bounded by the zero point of a periodic excitation signal in time. Therefore, the introduction of the matching circuit is only used to explain the access of the first excitation signal to the circularly polarized radiation source 10 at one of the electrical feeding points 100 and the access of the second excitation signal to the circularly polarized radiation source 10 at the other electrical feeding point 100 in an actual circuit. The electrical connection relationship between the circularly polarized radiation source 10 at the two electrical feeding points 100 and the oscillation unit in an actual circuit includes the electrical connection between the circularly polarized radiation source 10 at the two electrical feeding points 100 and the oscillation unit through a corresponding microstrip circuit and / or electronic components, without restricting the description of the principle electrical connection relationship that the circularly polarized radiation source 10 accesses the first excitation signal at one of the electrical feeding points 100 and accesses the second excitation signal that is out of phase with the first excitation signal at the other electrical feeding point 100. The specific structural and parameter design of the matching network does not constitute a limitation to the present invention.

[0175] Similarly, in this optimized structure of the present invention, in the state where each circularly polarized radiation source 10 is anti-phase double-fed by accessing the first excitation signal at one of the electrical feeding points 100 and accessing the second excitation signal at the other electrical feeding point 100, at least one circularly polarized radiation source 10 is electrically connected to the reference ground electrode at the physical center point of the circularly polarized radiation source 10. Preferably, each circularly polarized radiation source 10 is electrically connected to the reference ground electrode at the physical center point of the circularly polarized radiation source 10, so as to form a closed-loop circuit for the first excitation signal and the second excitation signal respectively between the two electrical feeding points 100 of the corresponding circularly polarized radiation source 10 and the physical center point of the circularly polarized radiation source 10, thereby reducing the impedance of the circularly polarized microwave Doppler detection device at frequencies deviating from the resonant operating point, correspondingly narrowing the bandwidth of the circularly polarized microwave Doppler detection device and being beneficial to improving the anti-interference performance of the circularly polarized microwave Doppler detection device.

[0176] That is to say, in the state where the circularly polarized radiation source 10 is fed in antiphase, based on the potential distribution relationship with the physical center point of the circularly polarized radiation source 10 being the zero potential point of the circularly polarized radiation source 10, by electrically connecting the physical center point of the circularly polarized radiation source 10 to the reference ground electrode, the potential distribution of the circularly polarized radiation source 10 can be maintained to maintain the radiation efficiency of the circularly polarized microwave Doppler detection device. That is, based on the structural design that the circularly polarized radiation source 10 is symmetric about the connection line of the two electrical feeding points 100, and the midpoint of the connection line of the two electrical feeding points 100 is located at the physical center point of the circularly polarized radiation source 10, the electrical connection between the physical center point of the circularly polarized radiation source 10 and the reference ground electrode can avoid energy loss caused by physical short - circuit and maintain the radiation efficiency of the circularly polarized microwave Doppler detection device, and at the same time improve the anti - interference performance of the circularly polarized microwave Doppler detection device.

[0177] Furthermore, in this embodiment of the present invention, in the state where the circularly polarized radiation source 10 is fed in antiphase, the ground plane 20 is electrically connected to the reference ground electrode, and each circularly polarized radiation source 10 is electrically connected to the ground plane 20 through a metallized via structure at the physical center point of the circularly polarized radiation source 10, so as to form a relationship in which the physical center point of the circularly polarized radiation source 10 is electrically connected to the reference ground electrode. Thus, it is simple and easy to implement and will not cause congestion in the circuit layout, which is beneficial to improving the anti - interference performance of the circularly polarized microwave Doppler detection device and its adaptability to the current miniaturization trend.

[0178] It is worth mentioning that in the above description of the present invention, the description of the position of the electrical feeding point 100 is a limitation on the electrical equivalent feeding position of the circularly polarized radiation source 10. The physical implementation structure of the entity physical feeding of the electrical feeding point 100 is diverse, and the corresponding entity physical feeding structures of the two electrical feeding points 100 of the same circularly polarized radiation source 10 are not restricted to be the same. Therefore, the circuit design of the corresponding circularly polarized microwave Doppler detection device is flexible and diverse and can adapt to different layout requirements.

[0179] In particular, based on the reflection mechanism of electromagnetic waves, the characteristic parameters of the size and shape of the electromagnetic reflector 30 and its position relative to the circularly polarized radiation source 10 correspond to a target space defined by the corresponding circularly polarized echoes that can be counter-rotated within the detection space and received by the circularly polarized radiation source 10 in the form of circularly polarized counter-rotating echoes. That is, the target space corresponds to the detection range of the movement of an object within the detection space by the circularly polarized microwave Doppler detection device. By adjusting the characteristic parameters of the size and shape of the electromagnetic reflector 30 and its position relative to the circularly polarized radiation source 10, the target space can be adjusted to precisely set the detection range of the movement of an object within the detection space. Compared with the existing Doppler microwave detection device, it breaks through the limitation that it is difficult to adjust the microwave coverage boundary to set the detection range of the movement of the corresponding object, which is beneficial to improving the applicability of the circularly polarized microwave Doppler detection device.

[0180] Specifically, referring to FIGS. Figure 5 and Figure 6 shown in the present invention, based on adjusting the target space by adjusting the position of the electromagnetic reflector 30 relative to the circularly polarized radiation source 10, the circularly polarized microwave Doppler detection device according to different deformation embodiments of the above-described embodiment of the present invention is schematically shown. In these two deformation embodiments of the present invention, the circularly polarized microwave Doppler detection device includes a plurality of the electromagnetic reflectors 30, and each of the electromagnetic reflectors 30 is independently disposed relative to the ground plane 20 and is movably disposed relative to the ground plane substrate 50. Then, the target space corresponds to the coverage range of the circularly polarized echoes that can be counter-rotated by the electromagnetic reflector 30 and received by the circularly polarized radiation source 10 in the form of circularly polarized counter-rotating echoes. Each of the electromagnetic reflectors 30 corresponds to a coverage range of the corresponding circularly polarized echoes that can be received by the circularly polarized radiation source 10 in the form of circularly polarized counter-rotating echoes and jointly defines the target space. Then, the target space corresponds to a range with different shapes and boundaries according to the size, shape, number of the electromagnetic reflectors 30 and their positions relative to the circularly polarized radiation source 10.

[0181] Corresponding to FIGS. Figure 5 in the present invention, in this deformation embodiment of the present invention, each of the electromagnetic reflectors 30 is movably disposed in the radial direction of the circularly polarized radiation source 10, so that the position of each of the electromagnetic reflectors 30 relative to the circularly polarized radiation source 10 is adjustable. Thus, the target space can be adjusted based on the active adjustment of at least one of the electromagnetic reflectors 30 to precisely set the detection range of the movement of an object within the detection space.

[0182] Corresponding to FIGS. Figure 6, in this variant embodiment of the present invention, each of the electromagnetic reflector plates 30 is rotatably arranged around the circularly polarized radiation source 10, so that the position of each electromagnetic reflector plate 30 relative to the circularly polarized radiation source 10 is adjustable. In this way, the target space can be adjusted based on the active adjustment of at least one electromagnetic reflector plate 30 to accurately set the detection range of the movement of the object in the detection space.

[0183] In particular, in these two variant embodiments of the present invention, each of the electromagnetic reflector plates 30 is independent of the ground plane 20. Then, the shape and size of the area of the ground plane substrate 50 outside the projection of the circularly polarized radiation source 10 in the direction perpendicular to the ground plane substrate 50 are not limited. Based on the fact that the material of the corresponding ground plane substrate 50 has certain electromagnetic reflection characteristics, preferably, the ground plane substrate 50 is provided with an opening 501 corresponding to the corresponding electromagnetic reflector plate 30. Then, while adjusting the position of the electromagnetic reflector plate 30 relative to the circularly polarized radiation source 10, the shielding of the corresponding opening 501 by the electromagnetic reflector plate 30 is adjusted, so as to reduce the influence of the reflection of the ground plane substrate 50 on the circularly polarized echo on the differential signal by means of the setting of the opening 501.

[0184] Further referring to FIGS. Figure 7A and 7B shown in the specification drawings of the present invention, based on adjusting the target space by adjusting the position of the electromagnetic reflector plate 30 relative to the circularly polarized radiation source 10, the circularly polarized microwave Doppler detection device according to another variant embodiment of the present invention is schematically shown, where Figure 7A and Figure 7B respectively schematically show the side cross-sectional structure of the circularly polarized microwave Doppler detection device and the top view structure from the circularly polarized radiation source 10 to the ground plane 20. Specifically, the circularly polarized microwave Doppler detection device includes a plurality of electromagnetic reflector plates 30, where each electromagnetic reflector plate 30 is independently arranged on a flexible substrate 70 independent of the ground plane 20, and the flexible substrate 70 is arranged on the ground plane substrate 50. Then, based on the flexible characteristics of the flexible substrate 70, the flexible substrate 70 is movable relative to the ground plane substrate 50. In this way, based on the active adjustment of the flexible substrate 70, an angle adjustment of the corresponding electromagnetic reflector plate 30 relative to the ground plane substrate 50 is formed, so as to adjust the position of the electromagnetic reflector plate 30 relative to the circularly polarized radiation source 10, and to adjust the target space to set the detection range of the movement of the object in the detection space.

[0185] It is worth mentioning that the circularly polarized microwave Doppler detection device emits at least one of the circularly polarized detection beams to the detection space in a circularly polarized manner, and counter-rotates the circularly polarized echo, and receives the circularly polarized counter-rotated echo, and outputs the difference signal based on the characteristic difference between the circularly polarized detection beam and the circularly polarized counter-rotated echo according to the Doppler effect principle, wherein the circularly polarized detection beam is reflected by an object in the detection space to form the circularly polarized echo, wherein the corresponding circularly polarized echo is reflected by the electromagnetic reflector 30 and counter-rotated to form the circularly polarized counter-rotated echo, and wherein based on the limitation of the corresponding circularly polarized counter-rotated echo transmitted to the circularly polarized radiation source 10, such as the limitation of the corresponding circularly polarized counter-rotated echo in a reflective and / or attenuating manner, the detection range of the movement of the object in the detection space by the circularly polarized microwave Doppler detection device can be further set in the target space.

[0186] Specifically, referring to the Figures 8A to 14B illustrations in the accompanying drawings of the specification of the present invention, the optimized structure of the circularly polarized microwave Doppler detection device according to the above-described embodiment of the present invention is schematically shown, wherein the circularly polarized microwave Doppler detection device is further provided with at least one electromagnetic restriction dam 80, and wherein the electromagnetic restriction dam 80 is movably arranged on the transmission path of the corresponding circularly polarized counter-rotated echo transmitted to the circularly polarized radiation source 10, so as to limit the transmission of the corresponding circularly polarized counter-rotated echo to the circularly polarized radiation source 10 in an attenuating and / or blocking manner by means of the electromagnetic restriction dam 80 on the transmission path of the corresponding circularly polarized counter-rotated echo, thereby adjusting the reception degree and range of the circularly polarized radiation source 10 for the corresponding circularly polarized counter-rotated echo, and thus further setting the detection range of the movement of the object in the detection space by the circularly polarized microwave Doppler detection device in the target space.

[0187] It is worth mentioning that the characteristic parameters of the size and shape of the electromagnetic restriction dam 80 and the position of the transmission path of the corresponding circularly polarized counter-rotated echo transmitted to the circularly polarized radiation source 10 relative to the circularly polarized radiation source 10 correspond to the corresponding range further defined by the corresponding circularly polarized echo that can be counter-rotated in the target space and received by the circularly polarized radiation source 10 in the form of the circularly polarized counter-rotated echo, that is, the detection range of the movement of the object in the detection space by the circularly polarized microwave Doppler detection device further defined in the target space, and wherein by adjusting the characteristic parameters of the size and shape of the electromagnetic restriction dam 80 and the position of the transmission path of the corresponding circularly polarized counter-rotated echo transmitted to the circularly polarized radiation source 10 relative to the circularly polarized radiation source 10, the detection range of the movement of the object in the detection space by the circularly polarized microwave Doppler detection device can be further adjusted in the target space to achieve precise setting of the detection range of the movement of the object in the detection space.

[0188] Exemplarily, referring to the accompanying drawings of the specification of the present invention Figure 8A and Figure 8B as shown, an optimized structure of the circularly polarized microwave Doppler detection device according to the above embodiments of the present invention is schematically shown, wherein Figure 8A and Figure 8B respectively schematically show the side sectional view structure of the circularly polarized microwave Doppler detection device and the top view structure from the circularly polarized radiation source 10 to the ground plane 20. The electromagnetic confinement dam 80 is respectively arranged at different azimuths around the circularly polarized radiation source 10 between the circularly polarized radiation source 10 and the electromagnetic reflector 30, and the electromagnetic confinement dam 80 is arranged to be reciprocally movable in the radial direction of the circularly polarized radiation source 10. Specifically, the electromagnetic confinement dam 80 has a size corresponding to the distance between the circularly polarized radiation source 10 and the electromagnetic reflector 30 in the direction from the circularly polarized radiation source 10 to the electromagnetic reflector 30, so that the electromagnetic confinement dam 80 passes through the transmission path of the corresponding circularly polarized anti-return wave transmitted to the circularly polarized radiation source 10. Thus, when the electromagnetic confinement dam 80 is reciprocally adjusted in the radial direction of the circularly polarized radiation source 10, the position of the transmission path of the corresponding circularly polarized anti-return wave transmitted to the circularly polarized radiation source 10 relative to the circularly polarized radiation source 10 is adjusted, and the reception degree and range of the corresponding circularly polarized anti-return wave are adjusted, and further, a further setting of the detection range of the movement of the object in the target space is formed.

[0189] Furthermore, assuming that the wavelength parameter of the circularly polarized electromagnetic wave corresponding to the frequency parameter of the circularly polarized microwave Doppler detection device is λ, the electromagnetic confinement dam 80 has a size greater than or equal to λ / 128 in the direction perpendicular to its movable direction, so that the electromagnetic confinement dam 80 has a reflection effect on the corresponding circularly polarized anti-return wave.

[0190] Preferably, the electromagnetic limiting dam 80 is movably arranged in the radial direction of the circularly polarized radiation source 10 within a distance from the position tangent to the circularly polarized radiation source 10 to 1λ from this position, that is, the electromagnetic limiting dam 80 is reciprocally movably arranged between the circularly polarized radiation source 10 and the electromagnetic reflector 30 within a distance of 1λ from the circularly polarized radiation source in the radial direction of the circularly polarized radiation source, so that during the process of the electromagnetic limiting dam 80 being movably adjusted in the radial direction of the circularly polarized radiation source 10, it passes through the transmission path of the corresponding circularly polarized anti-return wave transmitted to the circularly polarized radiation source 10, that is, the movable adjustment of the electromagnetic limiting dam 80 can form a change in the position of the transmission path of the corresponding circularly polarized anti-return wave transmitted to the circularly polarized radiation source 10 relative to the circularly polarized radiation source 10, thereby adjusting the receiving degree and range of the corresponding circularly polarized anti-return wave, and further realizing a further setting of the detection range of the movement of an object in the target space.

[0191] Further referring to the accompanying drawings of the specification of the present invention Figure 9 as shown, another optimized structure of the circularly polarized microwave Doppler detection device according to the above embodiment of the present invention is schematically shown. Different from the circularly polarized microwave Doppler detection device Figure 8A and 8B schematically shown, in this optimized structure of the circularly polarized microwave Doppler detection device according to the above embodiment of the present invention, the electromagnetic limiting dam 80 is reciprocally movably arranged in the direction from the circularly polarized radiation source 10 to the electromagnetic reflector 30. Specifically, the electromagnetic limiting dam 80 is reciprocally movably arranged in the radial direction of its thickness and in the direction from the circularly polarized radiation source 10 to the electromagnetic reflector 30, so that when the electromagnetic limiting dam 80 is reciprocally movably adjusted in the direction from the circularly polarized radiation source 10 to the electromagnetic reflector 30, the position of the transmission path of the corresponding circularly polarized anti-return wave transmitted to the circularly polarized radiation source 10 relative to the circularly polarized radiation source 10 is adjusted, and the receiving degree and range of the corresponding circularly polarized anti-return wave are adjusted, and further a further setting of the detection range of the movement of an object in the target space is formed.

[0192] Further referring to the accompanying drawings of the specification of the present invention Figures 10A to 10CAs shown, another optimized structure of the circularly polarized microwave Doppler detection device according to the above embodiments of the present invention is schematically shown. In this optimized structure of the circularly polarized microwave Doppler detection device according to the above embodiments of the present invention, the electromagnetic restriction dam 80 is pivotally arranged between the circularly polarized radiation source 10 and the electromagnetic reflector 30 with an axis parallel to the plane where the circularly polarized radiation source 10 is located as the pivot axis, that is, the electromagnetic restriction dam 80 is reciprocally pivotally arranged in the direction from the circularly polarized radiation source 10 to the electromagnetic reflector 30. In this way, when the electromagnetic restriction dam 80 is pivotally adjusted around this pivot axis, the distance and angle of the electromagnetic restriction dam 80 between the circularly polarized radiation source 10 and the electromagnetic reflector 30 relative to the circularly polarized radiation source 10 are adjusted, that is, the position of the transmission path of the corresponding circularly polarized counter-rotating echo transmitted to the circularly polarized radiation source 10 relative to the circularly polarized radiation source 10 is adjusted, and the reception degree and range of the corresponding circularly polarized counter-rotating echo are adjusted, thereby further setting the detection range of the movement of the object in the target space.

[0193] Specifically, corresponding to Figure 10A 、 Figure 10B and Figure 10C , the electromagnetic restriction dam 80 is pivotally arranged between the circularly polarized radiation source 10 and the electromagnetic reflector 30 with different axes parallel to the plane where the circularly polarized radiation source 10 is located as the pivot axes. It can be understood that as long as the pivotal adjustment of the electromagnetic restriction dam 80 between the circularly polarized radiation source 10 and the electromagnetic reflector 30 can adjust the distance and angle of the electromagnetic restriction dam 80 relative to the circularly polarized radiation source 10 within the range from the position tangent to the circularly polarized radiation source 10 to a distance of 1λ from this position, the reception degree and range of the corresponding circularly polarized counter-rotating echo can be adjusted, thereby further setting the detection range of the movement of the object in the target space. The specific position of the pivot axis of the electromagnetic restriction dam 80 does not constitute a limitation to the present invention.

[0194] Furthermore, referring to FIGS. Figure 11A and 11B, another optimized structure of the circularly polarized microwave Doppler detection device according to the above embodiments of the present invention is schematically shown. In this optimized structure of the circularly polarized microwave Doppler detection device according to the above embodiments of the present invention, the electromagnetic confinement dam 80 is rotatably arranged around the circularly polarized radiation source 10 between the circularly polarized radiation source 10 and the electromagnetic reflector 30. Specifically, the electromagnetic confinement dam 80 is set to have an arc corresponding to the periphery of the circularly polarized radiation source 10, and the arc length of the electromagnetic confinement dam 80 does not satisfy the condition of annularly surrounding the circularly polarized radiation source 10. Then, when the electromagnetic confinement dam 80 is rotationally adjusted, the transmission of the corresponding circularly polarized counter-rotating echo in different orientations to the circularly polarized radiation source 10 is restricted in a way of attenuation and / or blocking, and the receiving degree and range of the corresponding circularly polarized counter-rotating echo are adjusted. Furthermore, a further setting of the detection range of the movement of an object is formed in the target space.

[0195] It is worth mentioning that based on the method of adjusting the characteristic parameters of the size and shape of the electromagnetic reflector 30 and its position relative to the circularly polarized radiation source 10 to realize the adjustment of the target space, combined with adjusting the characteristic parameters of the size and shape of the electromagnetic confinement dam 80 and the position of the transmission path of the corresponding circularly polarized counter-rotating echo transmitted to the circularly polarized radiation source 10 relative to the circularly polarized radiation source 10, the detection range of the movement of an object in the detection space of the circularly polarized microwave Doppler detection device can be further adjusted in the target space to realize the precise setting of the detection range of the movement of an object in the detection space.

[0196] Specifically, referring to FIGS. Figure 12A and Figure 12B of the specification drawings of the present invention, based on Figure 6 the circularly polarized microwave Doppler detection device corresponding to the deformation embodiment and Figure 11A and 11B the combination of the optimized structures of the circularly polarized microwave Doppler detection device corresponding to the embodiments, an optimized structure of the circularly polarized microwave Doppler detection device corresponding to the corresponding Figure 6 deformation embodiment of the present invention is schematically shown. The circularly polarized microwave Doppler detection device includes a plurality of the electromagnetic reflectors 30, and each of the electromagnetic reflectors 30 is arranged in different orientations around the circularly polarized radiation source 10 on the grounding plate substrate 50. Then, each of the electromagnetic reflectors 30 corresponds to a coverage range of the corresponding circularly polarized echo that can be received by the circularly polarized radiation source 10 in the form of the circularly polarized counter-rotating echo, and together they define the target space. The target space has a corresponding shape and boundary range corresponding to the size, shape, quantity of the electromagnetic reflectors 30 and their positions relative to the circularly polarized radiation source 10.

[0197] Further, the electromagnetic limiting dam 80 is rotatably arranged around the circularly polarized radiation source 10 between the circularly polarized radiation source 10 and the electromagnetic reflector 30. Specifically, the electromagnetic limiting dam 80 is arranged to have a radian corresponding to the periphery of the circularly polarized radiation source 10, and the arc length of the electromagnetic limiting dam 80 does not satisfy the condition of annularly surrounding the circularly polarized radiation source 10. Then, when the electromagnetic limiting dam 80 is rotationally adjusted, the transmission of the corresponding circularly polarized anti-return waves in different orientations to the circularly polarized radiation source 10 is limited in a manner of attenuation and / or blocking, and the receiving degree and range of the corresponding circularly polarized anti-return waves are adjusted. Thus, the detection range of the movement of the object in the detection space by the circularly polarized microwave Doppler detection device is further adjusted in the target space to achieve the precise setting of the detection range of the movement of the object in the detection space.

[0198] Further referring to FIGS. Figure 13A and Figure 13B of the specification drawings of the present invention, Figure 6 Another optimized structure of the circularly polarized microwave Doppler detection device according to the corresponding

[0199] deformation embodiment of the present invention is schematically shown. In this optimized structure of the circularly polarized microwave Doppler detection device according to the above deformation embodiment of the present invention, the electromagnetic limiting dam 80 is pivotally arranged between the circularly polarized radiation source 10 and the electromagnetic reflector 30 with different axes perpendicular to the plane where the circularly polarized radiation source 10 is located as the pivot axes. Specifically, the electromagnetic limiting dam 80 has a radian corresponding to the periphery of the circularly polarized radiation source 10, and the pivot axis of the electromagnetic limiting dam 80 is arranged close to the periphery of the circularly polarized radiation source 10. Then, the pivotal adjustment of the electromagnetic limiting dam 80 corresponds to the angular adjustment between the electromagnetic limiting dam 80 and the periphery of the circularly polarized radiation source 10, that is, the pivotal adjustment of the electromagnetic limiting dam 80 can form a position change of the electromagnetic limiting dam 80 relative to the circularly polarized radiation source 10 between the circularly polarized radiation source 10 and the electromagnetic reflector 30, corresponding to a position change of the electromagnetic limiting dam 80 relative to the circularly polarized radiation source 10 for the transmission path of the corresponding circularly polarized anti-return waves transmitted to the circularly polarized radiation source 10. The receiving degree and range of the corresponding circularly polarized anti-return waves are adjusted. Thus, the detection range of the movement of the object in the detection space by the circularly polarized microwave Doppler detection device is further adjusted in the target space to achieve the precise setting of the detection range of the movement of the object in the detection space.

[0199] Further referring to FIGS. Figure 14A and Figure 14B of the specification drawings of the present invention, Figure 6 Another optimized structure of the circularly polarized microwave Doppler detection device according to the corresponding Figure 13Aand Figure 13B The optimized structure of the circularly polarized microwave Doppler detection device shown in the figure. In the optimized structure of the circularly polarized microwave Doppler detection device of the above-described variant embodiment of the present invention, the pivot axis of the electromagnetic confinement dam 80 is disposed on the ground plane substrate 50 away from the periphery of the circularly polarized radiation source 10, wherein the end of the electromagnetic confinement dam 80 away from its pivot axis is bent and extends on the electromagnetic confinement dam 80 and has an arc corresponding to the periphery of the circularly polarized radiation source 10, so that when the electromagnetic confinement dam 80 is pivotally adjusted, the end of the electromagnetic confinement dam 80 having an arc corresponding to the periphery of the circularly polarized radiation source 10 can approach / away from the periphery of the circularly polarized radiation source 10 in a translational movement manner within a certain distance range, thereby forming a position change of the electromagnetic confinement dam 80 relative to the circularly polarized radiation source 10 between the circularly polarized radiation source 10 and the electromagnetic reflector 30, corresponding to the position change of the electromagnetic confinement dam 80 relative to the circularly polarized radiation source 10 formed by the transmission path of the corresponding circularly polarized counter-rotating echo transmitted to the circularly polarized radiation source 10, and the reception degree and range of the corresponding circularly polarized counter-rotating echo are adjusted, then the detection range of the circularly polarized microwave Doppler detection device for the movement of the object in the detection space is further adjusted in the target space to achieve precise setting of the detection range of the movement of the object in the detection space.

[0200] It can be understood that the present invention discloses the structure and principle of the circularly polarized microwave Doppler detection device by taking a single-feed structure as an example. Among them, based on the existing circular polarization methods, including but not limited to circular polarization by forming a circular current by feeding the oscillation unit at the electrical feeding point 100 through the feeding column 60 in a single-feed structure, and circular polarization by phase-shifting feeding the oscillation unit at different electrical feeding points 100 through the corresponding feeding columns 60 in a multi-feed structure (including a multi-element radiation source feeding structure) to achieve orthogonal currents with a 90° phase difference. The corresponding circularly polarized radiation source 10 has various structures and shapes, and when the circularly polarized radiation source 10 is set to be circularly polarized by phase-shifting feeding the oscillation unit in a multi-feed structure to achieve orthogonal currents with a 90° phase difference, the ground plane 20 may not be provided, and the present invention does not limit this.

[0201] Further, it can be understood that when a solid medium (such as a PCB board) is provided between the circularly polarized radiation source 10 and the ground plane 20, correspondingly, the circularly polarized radiation source 10 and the ground plane 20 are spaced apart on both sides of the solid medium, and accordingly, the radiation source substrate 40 and the ground plane substrate 50 may not be provided, that is, the circularly polarized radiation source 30 is fixedly provided on the corresponding solid medium on the side facing the electromagnetic reflector 30, where the feeding post 60 may be provided as a conductive structure formed on the corresponding solid medium by means of a metallized via process, and the present invention does not limit this.

[0202] Specifically, referring to Figures 15A to 16 shown in the accompanying drawings of the specification of the present invention, the structure of the corresponding circularly polarized radiation source 10 for realizing circular polarization based on a dual-feed structure of the circularly polarized microwave Doppler detection device according to different embodiments of the present invention is schematically shown. Corresponding to Figures 15A to 15F the circularly polarized radiation source 10 is provided in a rectangular shape and has two electrical feeding points 100, wherein the lines connecting the two electrical feeding points 100 to the physical center point of the circularly polarized radiation source 10 are perpendicular to each other. Corresponding to the oscillation unit, the circularly polarized radiation source 10 is fed with two excitation signals having a 90° phase difference at the two electrical feeding points 100 to achieve circular polarization setting of the circularly polarized radiation source 10. Based on the physical feeding structure corresponding to the electrical feeding points 100, the structure of the circularly polarized radiation source 10 is diverse.

[0203] Specifically, corresponding to Figure 15A the two electrical feeding points 100 of the circularly polarized radiation source 10 are provided in a point feeding (probe feeding) structure and are respectively connected to two excitation signals having a 90° phase difference at the two feeding connection points 101. Corresponding to Figure 15B the two electrical feeding points 100 of the circularly polarized radiation source 10 are provided in an edge feeding structure. Corresponding to the circularly polarized radiation source 10, two edge feed lines 104 are respectively connected to two excitation signals having a 90° phase difference. The edge feed lines 104 are microstrip lines adjacent to and parallel to the straight edges of the circularly polarized radiation source 10, and the electrical equivalent feeding points 100 of the circularly polarized radiation source 10 are electrically equivalent to be located at the midpoints of the microstrip lines serving as the edge feed lines. Corresponding to Figure 15C one of the electrical feeding points 100 of the circularly polarized radiation source 10 is provided in an edge feeding structure, and the other electrical feeding point 100 is provided in a point feeding (probe feeding) structure. Corresponding to the circularly polarized radiation source 10, two excitation signals having a 90° phase difference are respectively connected to the circularly polarized radiation source 10 at a feeding connection point 101 and through an edge feed line 104. Corresponding to Figure 15D, the two electrical feeding points 100 of the circularly polarized radiation source 10 are arranged in a microstrip feeding structure. Corresponding to the circularly polarized radiation source 10, two excitation signals with a 90° phase difference are respectively connected through two microstrip feeding lines 105. Among them, the electrical feeding point 100 is electrically equivalent to the point on the circularly polarized radiation source 10 that is electrically connected to the microstrip feeding line 105. Corresponding to Figure 15E , one of the electrical feeding points 100 of the circularly polarized radiation source 10 is arranged in a microstrip feeding structure, and the other electrical feeding point 100 is arranged in a point feeding (probe feeding) structure. Corresponding to the circularly polarized radiation source 10, two excitation signals with a 90° phase difference are respectively connected through one microstrip feeding line 105 and at a feeding connection point 101. Corresponding to Figure 15F , one of the electrical feeding points 100 of the circularly polarized radiation source 10 is arranged in a microstrip feeding structure, and the other electrical feeding point 100 is arranged in an edge feeding structure. Corresponding to the circularly polarized radiation source 10, two excitation signals with a 90° phase difference are respectively connected through one microstrip feeding line 105 and through one edge feeding line 104.

[0204] Corresponding to Appendix Figure 16 , the circularly polarized radiation source 10 is set to be circular and also has two electrical feeding points 100, and the lines connecting the two electrical feeding points 100 to the physical center point of the circularly polarized radiation source 10 are perpendicular to each other.

[0205] As described above, when the circularly polarized radiation source 10 is set to a dual-feed structure with two electrical feeding points 100, different from the circularly polarized radiation source 10 with the aforementioned single-feed structure, the circularly polarized microwave Doppler detection device with the circularly polarized radiation source 10 having a dual-feed structure may not be provided with the ground plane 20. That is, on the basis of the circularly polarized microwave Doppler detection device with the circularly polarized radiation source 10 having a single-feed structure as described above, the circularly polarized radiation source 10 is provided with two electrical feeding points 100, and the lines connecting the two electrical feeding points 100 to the physical center point of the circularly polarized radiation source 10 are perpendicular to each other to form the circularly polarized microwave Doppler detection device with the circularly polarized radiation source 10 having a dual-feed structure. Among them, based on the circular polarization principle of the circularly polarized radiation source 10 with a dual-feed structure, the ground plane 20 may not be provided.

[0206] Similarly, in these embodiments of the present invention, the circularly polarized radiation source 10 is further provided with the grounding point 103 at the physical center point of the circularly polarized radiation source, and the circularly polarized radiation source 10 is grounded at the grounding point 103.

[0207] Furthermore, referring to the accompanying drawings of the specification of the present invention Figures 17 to 20As shown, the structure of the corresponding circularly polarized radiation source 10 that realizes circular polarization based on a multi-feed structure of the circularly polarized microwave Doppler detection device according to different embodiments of the present invention is schematically shown, corresponding to the attached Figure 17 , the circularly polarized radiation source 10 is set to be circular and has three electrical feeding points 100, where each electrical feeding point 100 is equidistant from the physical center point of the circularly polarized radiation source 10 and is equidistantly arranged on the circularly polarized radiation source 10 around the physical center point of the circularly polarized radiation source 10. Then, in the direction of the physical center point of the circularly polarized radiation source 10 on the circularly polarized radiation source 10, the connection lines between adjacent electrical feeding points 100 and the physical center point of the circularly polarized radiation source 10 form an angle of 120°. Corresponding to the oscillation unit, three-way excitation signals with a 120° phase difference in sequence are fed to the circularly polarized radiation source 10 at the three electrical feeding points 100 to achieve the circular polarization setting of the circularly polarized radiation source 10.

[0208] Corresponding to the attached Figure 18 , the circularly polarized radiation source 10 is set to be circular and has four electrical feeding points 100, where each electrical feeding point 100 is equidistant from the physical center point of the circularly polarized radiation source 10 and is equidistantly arranged on the circularly polarized radiation source 10 around the physical center point of the circularly polarized radiation source 10. Then, in the direction of the physical center point of the circularly polarized radiation source 10 on the circularly polarized radiation source 10, the connection lines between adjacent electrical feeding points 100 and the physical center point of the circularly polarized radiation source 10 form an angle of 90°. Corresponding to the oscillation unit, four-way excitation signals with a 90° phase difference in sequence are fed to the circularly polarized radiation source 10 at the four electrical feeding points 100 to achieve the circular polarization setting of the circularly polarized radiation source 10.

[0209] Corresponding to the attached Figure 19 , the circularly polarized radiation source 10 is set to be circular and has six electrical feeding points 100, where each electrical feeding point 100 is equidistant from the physical center point of the circularly polarized radiation source 10 and is equidistantly arranged on the circularly polarized radiation source 10 around the physical center point of the circularly polarized radiation source 10. Then, in the direction of the physical center point of the circularly polarized radiation source 10 on the circularly polarized radiation source 10, the connection lines between adjacent electrical feeding points 100 and the physical center point of the circularly polarized radiation source 10 form an angle of 60°. Corresponding to the oscillation unit, six-way excitation signals with a 60° phase difference in sequence are fed to the circularly polarized radiation source 10 at the six electrical feeding points 100 to achieve the circular polarization setting of the circularly polarized radiation source 10.

[0210] Corresponding to the attached Figure 20, the circular polarization radiation source 10 is set to be circular and has eight electrical feeding points 100, wherein each of the electrical feeding points 100 is equidistant from the physical center point of the circular polarization radiation source 10 and is arranged on the circular polarization radiation source 10 at equal distances around the physical center point of the circular polarization radiation source 10. Then, in the direction around the physical center point of the circular polarization radiation source 10 on the circular polarization radiation source 10, the connection line between the adjacent electrical feeding points 100 and the physical center point of the circular polarization radiation source 10 forms an angle of 45°. Corresponding to the oscillation unit, eight-way excitation signals with a 45° phase difference in sequence at the eight electrical feeding points 100 are used to feed the circular polarization radiation source 10, so as to realize the circular polarization setting of the circular polarization radiation source 10.

[0211] Similarly, in these four embodiments of the present invention, a ground point 103 is further arranged at the physical center point of the circular polarization radiation source 10, and the circular polarization radiation source 10 is grounded at the ground point 103.

[0212] It is worth mentioning that the number of the electrical feeding points 100 of the corresponding circular polarization radiation source 10 that realizes circular polarization based on the multi-feeding structure does not constitute a limitation to the present invention. Wherein, corresponding to the number of the electrical feeding points 100 of the circular polarization radiation source 10, the circular polarization radiation source 10 has corresponding polarization intervals. Based on the mixing and detection of the signals of the corresponding feeding circuits, the detection ranges corresponding to different polarization intervals can be respectively detected to realize the angular division setting of the detection range of the movement of an object in the detection space.

[0213] It is worth mentioning that, based on the reflection mechanism of electromagnetic waves, the present invention anti-rotates the circularly polarized echo in a reflective manner by setting the electromagnetic reflection plate 30, so that the corresponding circularly polarized echo can be received by the circularly polarized radiation source 10 in the form of a circularly polarized anti-rotated echo with the same rotation direction as the circularly polarized detection beam. This breaks through the limitation that the circularly polarized microwave Doppler detection device using circularly polarized electromagnetic waves cannot be applied to the detection of object motion based on the Doppler effect principle of electromagnetic waves with a transceiver-integrated design due to the orthogonality of the rotation directions of circularly polarized electromagnetic waves. Thus, the circularly polarized microwave Doppler detection device can detect object motion based on the Doppler effect principle of electromagnetic waves and adopt a transceiver-integrated design. Moreover, due to the use of circularly polarized electromagnetic waves, the anti-attenuation characteristics and anti-rain-and-fog interference ability of the circularly polarized microwave Doppler detection device are improved; wherein the target space defined by the corresponding circularly polarized echo that can be anti-rotated and received by the circularly polarized radiation source 10 in the form of the circularly polarized anti-rotated echo in the detection space corresponds to the detection range of the motion of an object in the detection space by the circularly polarized microwave Doppler detection device. The present invention further forms an adjustment of the target space based on the characteristic parameters of the size and shape of the electromagnetic reflection plate 30 and its corresponding relationship with the target space in terms of the position relative to the circularly polarized radiation source 10, and realizes the precise setting of the detection range of the motion of an object in the detection space by adjusting the characteristic parameters of the size and shape of the electromagnetic reflection plate 30 and its position relative to the circularly polarized radiation source 10; wherein based on the setting of the electromagnetic reflection plate 30, the present invention further forms a transmission limitation on the corresponding circularly polarized anti-rotated echo based on the transmission path of the corresponding circularly polarized anti-rotated echo transmitted towards the circularly polarized radiation source 10. By setting the electromagnetic restriction dam 80 on the transmission path of the corresponding circularly polarized anti-rotated echo and adjusting the characteristic parameters of the size and shape of the electromagnetic restriction dam 80, and by adjusting the position of the electromagnetic restriction dam 80 relative to the circularly polarized radiation source 10 on the transmission path of the corresponding circularly polarized anti-rotated echo transmitted towards the circularly polarized radiation source 10, the detection range of the motion of an object in the detection space by the circularly polarized microwave Doppler detection device is further set in the target space, so as to further realize the precise setting of the detection range of the motion of an object in the detection space.

[0214] In particular, based on the realization of circular polarization by a multi-feed structure and further combined with the adjustment of the electromagnetic reflection plate 30 and / or the electromagnetic restriction dam 80, the detection range of the motion of an object in the detection space by the circularly polarized microwave Doppler detection device can be accurately set in terms of angles and / or regions, which is beneficial to the application of the circularly polarized microwave Doppler detection device in detecting in a specific range, such as detecting a corresponding moving object in a precise small range, or detecting a corresponding moving object in different local spaces of the same place.

[0215] Furthermore, based on the mixing detection of the corresponding feed circuit signals of the multi-feed structure, and / or the real-time adjustment of the electromagnetic reflector 30 and / or the electromagnetic restriction dam 80, the detection range of the movement of an object in the detection space by the circularly polarized microwave Doppler detection device can be set and adjusted in terms of angles and / or regions in real time. When the circularly polarized microwave Doppler detection device is applied to the presence of a human body, based on the detection of human movement, micro-movement, and breathing / heartbeat in terms of angles and / or regions, the circularly polarized microwave Doppler detection device is applicable to intelligent control applications based on human activities in different scenarios.

[0216] Therefore, the circularly polarized radiation source 10 of the circularly polarized microwave Doppler detection device of the present invention is preferably arranged to adopt a multi-feed structure with dual feeding, so that the adjustment of the electromagnetic reflector 30 and / or the electromagnetic restriction dam 80 of the circularly polarized microwave Doppler detection device can obtain a larger applicable range of the circularly polarized microwave Doppler detection device, and on this basis, it is beneficial to simplify the structure of the circularly polarized microwave Doppler detection device and reduce the volume and cost of the circularly polarized microwave Doppler detection device.

[0217] It can be understood that there are various changes in the characteristic parameters of the size and shape of the corresponding electromagnetic reflector 30 and its position relative to the circularly polarized radiation source 10, the characteristic parameters of the size and shape of the electromagnetic restriction dam 80, and the position of the transmission path of the corresponding circularly polarized reverse echo transmitted by the electromagnetic restriction dam 80 to the circularly polarized radiation source 10 relative to the circularly polarized radiation source 10. The above descriptions of the characteristic parameters of the size and shape of the corresponding electromagnetic reflector 30 and its position relative to the circularly polarized radiation source 10, the characteristic parameters of the size and shape of the electromagnetic restriction dam 80, and the position of the transmission path of the corresponding circularly polarized reverse echo transmitted by the electromagnetic restriction dam 80 to the circularly polarized radiation source 10 relative to the circularly polarized radiation source 10 are used as examples to demonstrate and illustrate the structure and principle of the present invention and do not limit the present invention. On the basis that the electromagnetic reflector 30 is arranged such that the circularly polarized radiation source 10 is located on the transmission path of the corresponding circularly polarized reverse echo, so that the corresponding circularly polarized echo can be reflected by the electromagnetic reflector 30 and received by the circularly polarized radiation source 10 in the form of the circularly polarized reverse echo; and the electromagnetic restriction dam 80 is arranged to be made of or contain ferromagnetic materials, such as nickel, on the principle that it is located or allowed to be adjusted to be located on the transmission path of the corresponding circularly polarized reverse echo formed by the reflection of the electromagnetic reflector 30 and transmitted to the circularly polarized radiation source 10, any deformation or modification can be made to the embodiments of the present invention.

[0218] In particular, to further disclose the present invention, the present invention further provides a detection method, and the detection method includes the steps of:

[0219] A. Transmit at least one of the circularly polarized detection beams to the detection space, wherein the circularly polarized detection beam is reflected by an object in the detection space to form the circularly polarized echo;

[0220] B. Reverse the circularly polarized echo, wherein the circularly polarized echo is reversed in a reflected manner to form the circularly polarized reversed echo;

[0221] C. Receive the circularly polarized reversed echo; and

[0222] D. Output the difference signal, wherein the difference signal corresponds to the difference in characteristic parameters between the circularly polarized detection beam and the circularly polarized reversed echo;

[0223] wherein the steps (A), (B), (C), and (D) are implemented by the same circularly polarized microwave Doppler detection device.

[0224] It can be understood that based on the Doppler effect principle, the difference signal corresponding to the difference in characteristic parameters between the circularly polarized detection beam and the circularly polarized reversed echo corresponds to the movement of the corresponding object in the detection space.

[0225] Specifically, the circularly polarized microwave Doppler detection device is provided with the circularly polarized radiation source 10 and the electromagnetic reflector 30, wherein in the step (B), the circularly polarized echo is reversed in a reflected manner by the electromagnetic reflector 30 to form the circularly polarized reversed echo transmitted to the circularly polarized radiation source 10.

[0226] Further, the circularly polarized microwave Doppler detection device is provided with the electromagnetic dam 80, wherein in the step (C), the electromagnetic dam 80 adjusts the receiving degree and range of the circularly polarized radiation source 10 for the corresponding circularly polarized reversed echo in an attenuating and / or blocking manner on the transmission path of the corresponding circularly polarized reversed echo formed by reflection by the electromagnetic reflector 30 and transmitted to the circularly polarized radiation source 10.

[0227] It is worth mentioning that in the step (D), the difference signal can be a frequency difference signal corresponding to the frequency difference between the circularly polarized detection beam and the circularly polarized reversed echo, or a phase difference signal corresponding to the phase difference between the circularly polarized detection beam and the circularly polarized reversed echo.

[0228] Specifically, the circularly polarized microwave Doppler detection device is provided with the mixing and detection unit, wherein in the step (D), the mixing and detection unit outputs the difference signal based on the frequency difference between the circularly polarized detection beam and the circularly polarized counter-rotating echo.

[0229] Those skilled in the art can understand that the above embodiments are only examples, and the features of different embodiments can be combined with each other to obtain embodiments that are easily conceivable according to the content disclosed in the present invention but are not explicitly pointed out in the drawings.

[0230] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the drawings are only examples and do not limit the present invention. The object of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention can be deformed or modified in any way without departing from the principle.

Claims

1. A circularly polarized microwave Doppler detection device, which is based on the Doppler effect principle and used for detecting moving objects. Characterized in that, Comprising: An oscillation unit, wherein the oscillation unit is arranged to be powered and output at least one excitation signal with the positive electrode or the ground electrode of the corresponding power supply as the reference ground electrode; A circularly polarized radiation source, wherein the circularly polarized radiation source is fed-connected to the oscillation unit and circularly polarized, so as to access the excitation signal when the oscillation unit is powered and emit at least one circularly polarized detection beam to a detection space in a circularly polarized manner; An electromagnetic reflector, wherein the electromagnetic reflector is arranged on the transmission path of the corresponding circularly polarized echo to reverse-rotate the corresponding circularly polarized echo in a reflective manner to form a circularly polarized reverse-rotating echo transmitted to the circularly polarized radiation source, wherein the circularly polarized echo is an echo formed by the circularly polarized detection beam being reflected by a corresponding object in the detection space; And A mixing and detection unit, wherein the mixing and detection unit is electrically coupled to the oscillation unit and the circularly polarized radiation source to output a difference signal corresponding to the characteristic parameter difference between the circularly polarized detection beam and the circularly polarized reverse-rotating echo, and the difference signal corresponds to the movement of the corresponding object in the detection space.

2. The circularly polarized microwave Doppler detection device according to claim 1, wherein the circularly polarized radiation source is arranged in the form of a sheet conductive layer and adopts a multi-feed structure and has a plurality of electrical feed points, and each of the electrical feed points is arranged on the circularly polarized radiation source equidistantly from the physical center point of the circularly polarized radiation source, and the circularly polarized radiation source is phase-shifted and fed by the oscillation unit at the electrical feed points with a corresponding phase difference to have a circularly polarized state.

3. The circularly polarized microwave Doppler detection device according to claim 2, wherein the circularly polarized radiation source adopts a multi-feed structure with dual feeds and has two electrical feed points, and the connecting lines of the two electrical feed points with the physical center point of the circularly polarized radiation source are perpendicular to each other, and the oscillation unit is arranged to feed the circularly polarized radiation source 10 with two excitation signals having a 90° phase difference at the two electrical feed points in a powered state to realize the circular polarization setting of the circularly polarized radiation source 10.

4. The circularly polarized microwave Doppler detection device according to claim 2, wherein the circularly polarized radiation source has three or more electrical feed points, and each of the electrical feed points is equidistant from the physical center point of the circularly polarized radiation source and is arranged on the circularly polarized radiation source equidistantly around the physical center point of the circularly polarized radiation source.

5. The circularly polarized microwave Doppler detection device according to claim 4, wherein the circularly polarized radiation source has three of the electrical feeding points, and the connecting lines between adjacent ones of the electrical feeding points and the physical center point of the circularly polarized radiation source form an angle of 120°, and the oscillation unit is arranged in a powered state to feed the circularly polarized radiation source with three-way excitation signals having a 120° phase difference in sequence at the three electrical feeding points, so as to achieve the circular polarization setting of the circularly polarized radiation source.

6. The circularly polarized microwave Doppler detection device according to claim 4, wherein the circularly polarized radiation source has four of the electrical feeding points, and the connecting lines between adjacent ones of the electrical feeding points and the physical center point of the circularly polarized radiation source form an angle of 90°, and the oscillation unit is arranged in a powered state to feed the circularly polarized radiation source with four-way excitation signals having a 90° phase difference in sequence at the four electrical feeding points, so as to achieve the circular polarization setting of the circularly polarized radiation source.

7. The circularly polarized microwave Doppler detection device according to claim 4, wherein the circularly polarized radiation source has six of the electrical feeding points, and the connecting lines between adjacent ones of the electrical feeding points and the physical center point of the circularly polarized radiation source form an angle of 60°, and the oscillation unit is arranged in a powered state to feed the circularly polarized radiation source with six-way excitation signals having a 60° phase difference in sequence at the six electrical feeding points, so as to achieve the circular polarization setting of the circularly polarized radiation source.

8. The circularly polarized microwave Doppler detection device according to claim 4, wherein the circularly polarized radiation source has eight of the electrical feeding points, and the connecting lines between adjacent ones of the electrical feeding points and the physical center point of the circularly polarized radiation source form an angle of 45°, and the oscillation unit is arranged in a powered state to feed the circularly polarized radiation source with eight-way excitation signals having a 45° phase difference in sequence at the eight electrical feeding points, so as to achieve the circular polarization setting of the circularly polarized radiation source.

9. The circularly polarized microwave Doppler detection device according to any one of claims 2 to 8, wherein the circularly polarized radiation source is arranged to have a regular shape with linear symmetry.

10. The circularly polarized microwave Doppler detection device according to claim 9, wherein the electrical feeding points are arranged in a point feeding structure, and corresponding to the circularly polarized radiation source, they are fed and connected to the oscillation unit at corresponding numbers of feeding connection points, and are phase-shifted and fed by the oscillation unit with corresponding phase differences.

11. The circularly polarized microwave Doppler detection device according to claim 10, wherein the circularly polarized microwave Doppler detection device further includes feeding posts corresponding to the number of the feeding connection points, and one end of each feeding post is electrically fixed to the circularly polarized radiation source at the feeding connection point, and the other end of the feeding post is fed and connected to the oscillation unit, so as to form the feeding connection between the circularly polarized radiation source and the oscillation unit at the feeding connection point through the feeding posts.

12. The circularly polarized microwave Doppler detection device according to claim 11, wherein the circularly polarized radiation source is fixedly arranged on a solid medium corresponding to one side of the electromagnetic reflecting plate, and the feeding column is arranged to be formed on the conductive structure of the solid medium by a metallized via process.

13. The circularly polarized microwave Doppler detection device according to claim 9, wherein at least one of the electrical feeding points is arranged in an edge feeding structure, and the corresponding circularly polarized radiation source accesses the excitation signal of the corresponding path through an edge feeder, wherein the edge feeder is a microstrip line adjacent to and parallel to the straight edge of the circularly polarized radiation source, and the corresponding electrical equivalent feeding point of the circularly polarized radiation source is electrically equivalent to being located at the midpoint of the edge feeder arranged as a microstrip line.

14. The circularly polarized microwave Doppler detection device according to claim 9, wherein at least one of the electrical feeding points is arranged in a microstrip feeding structure, and the corresponding circularly polarized radiation source accesses the excitation signal of the corresponding path through a microstrip feeder line, and the corresponding electrical feeding point of the circularly polarized radiation source is electrically equivalent to being located at the point on the circularly polarized radiation source that is electrically connected to the microstrip feeder line.

15. The circularly polarized microwave Doppler detection device according to claim 9, wherein in the state where the oscillation unit is powered, the circularly polarized radiation source is electrically connected to the reference ground electrode and grounded.

16. The circularly polarized microwave Doppler detection device according to claim 1, wherein the circularly polarized radiation source adopts a single feeding structure and has an electrical feeding point and at least one degenerate mode separation unit, and the circularly polarized microwave Doppler detection device further includes a ground plane, wherein the circularly polarized radiation source and the ground plane are arranged at intervals, wherein the electrical feeding point is arranged deviating from the physical center of the circularly polarized radiation source, wherein the degenerate mode separation unit is integrally formed on the circularly polarized radiation source, wherein the circularly polarized radiation source is fed and connected to the oscillation unit at the electrical feeding point, so that when the circularly polarized radiation source accesses the excitation signal at the electrical feeding point and is fed by the oscillation unit, the circularly polarized radiation source can generate two degenerate modes with orthogonal polarizations, and the degenerate mode separation unit is used to separate the resonant frequencies of the two degenerate modes with orthogonal polarizations to form a 90° phase difference between the two orthogonal degenerate modes, so that when the circularly polarized radiation source is fed by the oscillation unit at the electrical feeding point, the circularly polarized radiation source emits the circularly polarized detection beam in a circularly polarized manner.

17. The circularly polarized microwave Doppler detection device according to claim 16, wherein the circularly polarized microwave Doppler detection device further includes a radiation source substrate and a ground plane substrate, wherein the radiation source substrate and the ground plane substrate are arranged at intervals, wherein the circularly polarized radiation source is arranged on the side of the radiation source substrate corresponding to the ground plane substrate, and the ground plane is arranged on the side of the ground plane substrate corresponding to the radiation source substrate.

18. The circularly polarized microwave Doppler detection device according to claim 17, wherein the electrical feeding point is arranged in a point feeding structure and is equivalently located at a feeding connection point on the circularly polarized radiation source, and the circularly polarized radiation source is fed and connected to the oscillation unit at the feeding connection point.

19. The circularly polarized microwave Doppler detection device according to claim 18, wherein the circularly polarized microwave Doppler detection device further includes a feeding post, and the feeding post is electrically fixed to the circularly polarized radiation source at the feeding connection point and is fixed to the ground plate substrate, so as to form a state where the circularly polarized radiation source is fixedly supported by the feeding post and is spaced apart from the ground plate, and a state where the radiation source substrate is supported and fixed to the circularly polarized radiation source and is spaced apart from the ground plate substrate.

20. The circularly polarized microwave Doppler detection device according to claim 19, wherein the feeding post is disconnected from the ground plate substrate and extends to the side of the ground plate substrate opposite to the side provided with the ground plate, and the oscillation unit is arranged on the side of the ground plate substrate opposite to the side provided with the ground plate and is fed and connected to the feeding post.

21. The circularly polarized microwave Doppler detection device according to claim 16, wherein the electrical feeding point is arranged in an edge feeding structure, and the circularly polarized radiation source is connected to the excitation signal through an edge feeder. The edge feeder is a microstrip line adjacent to and parallel to the straight edge of the circularly polarized radiation source, and the electrical equivalent feeding point is electrically equivalent to the midpoint of the edge feeder provided as a microstrip line.

22. The circularly polarized microwave Doppler detection device according to claim 16, wherein the electrical feeding point is arranged in a microstrip feeding structure, and the circularly polarized radiation source is connected to the excitation signal through a microstrip feeder. The electrical feeding point is electrically equivalent to the point on the circularly polarized radiation source electrically connected to the microstrip feeder.

23. The circularly polarized microwave Doppler detection device according to any one of claims 16 to 22, wherein in a state where the oscillation unit is powered, the circularly polarized radiation source is electrically connected to the reference ground electrode and is grounded.

24. The circularly polarized microwave Doppler detection device according to claim 23, wherein the circularly polarized radiation source has a grounding point, and the grounding point is the physical center point of the circularly polarized radiation source. The circularly polarized radiation source is electrically connected to the reference ground electrode and is grounded at the grounding point.

25. The circularly polarized microwave Doppler detection device according to claim 24, wherein in a state where the oscillation unit is powered, the ground plate is connected to the reference ground electrode, and the circularly polarized radiation source is electrically connected to the ground plate and is grounded at the grounding point.

26. The circularly polarized microwave Doppler detection device according to any one of claims 16 to 22, wherein the circularly polarized radiation source is arranged in the form of a sheet-like conductive layer and further has another said electrical feeding point, wherein the connection line of the two said electrical feeding points of the circularly polarized radiation source passes through the physical center point of the circularly polarized radiation source, wherein the oscillation unit is arranged to be powered and output a first excitation signal with the positive pole or the ground pole of the corresponding power supply as the reference ground pole, and a second excitation signal that is opposite in phase to the first excitation signal, wherein the circularly polarized radiation source is arranged such that one of the said electrical feeding points is connected to the first excitation signal, and the other said electrical feeding point is connected to the second excitation signal.

27. The circularly polarized microwave Doppler detection device according to claim 26, wherein the midpoint of the connection line of the two said electrical feeding points is located at the physical center point of the circularly polarized radiation source, that is, in the state where the connection line of the two said electrical feeding points of the circularly polarized radiation source passes through the physical center point of the circularly polarized radiation source, the two said electrical feeding points are symmetric with respect to the physical center point of the circularly polarized radiation source.

28. The circularly polarized microwave Doppler detection device according to claim 23, wherein the electromagnetic reflection plate extends integrally from the ground plate.

29. The circularly polarized microwave Doppler detection device according to any one of claims 1 to 8 and 16 to 22, wherein the circularly polarized microwave Doppler detection device further comprises an electromagnetic restriction dam, wherein the electromagnetic restriction dam is fixedly arranged between the circularly polarized radiation source and the electromagnetic reflection plate, so as to restrict the transmission of the corresponding circularly polarized counter-rotating echo to the circularly polarized radiation source in a manner of attenuation and / or blocking through the electromagnetic restriction dam in the transmission path of the corresponding circularly polarized counter-rotating echo, thereby adjusting the reception degree and range of the circularly polarized radiation source for the corresponding circularly polarized counter-rotating echo.

30. The circularly polarized microwave Doppler detection device according to any one of claims 1 to 8 and 16 to 22, wherein the circularly polarized microwave Doppler detection device further comprises at least one electromagnetic restriction dam, wherein the electromagnetic restriction dam is arranged movably between the circularly polarized radiation source and the electromagnetic reflection plate, so as to restrict the transmission of the corresponding circularly polarized counter-rotating echo to the circularly polarized radiation source in a manner of attenuation and / or blocking through the electromagnetic restriction dam in the transmission path of the corresponding circularly polarized counter-rotating echo, thereby adjusting the reception degree and range of the circularly polarized radiation source for the corresponding circularly polarized counter-rotating echo.

31. The circularly polarized microwave Doppler detection device according to claim 30, wherein the electromagnetic restriction dam is arranged to be reciprocally movable in the radial direction of the circularly polarized radiation source, and has a dimension corresponding to the distance between the circularly polarized radiation source and the electromagnetic reflection plate in the direction from the circularly polarized radiation source to the electromagnetic reflection plate.

32. The circular polarization microwave Doppler detection device according to claim 31, wherein the wavelength parameter of the circular polarization electromagnetic wave corresponding to the frequency parameter of the circular polarization microwave Doppler detection device is λ, and the electromagnetic confinement dam has a size greater than or equal to λ / 128 in the direction perpendicular to its movable direction.

33. The circular polarization microwave Doppler detection device according to claim 32, wherein the electromagnetic confinement dam is reciprocally movably arranged within a distance of 1λ from the circular polarization radiation source.

34. The circular polarization microwave Doppler detection device according to claim 30, wherein the electromagnetic confinement dam is reciprocally movably arranged in the direction from the circular polarization radiation source towards the electromagnetic reflector.

35. The circular polarization microwave Doppler detection device according to claim 30, wherein the electromagnetic confinement dam is reciprocally pivotably arranged in the direction from the circular polarization radiation source towards the electromagnetic reflector.

36. The circular polarization microwave Doppler detection device according to claim 30, wherein the electromagnetic confinement dam is rotatably arranged around the circular polarization radiation source between the circular polarization radiation source and the electromagnetic reflector.

37. The circular polarization microwave Doppler detection device according to claim 30, wherein the electromagnetic confinement dam is pivotably arranged around an axis perpendicular to the plane where the circular polarization radiation source is located between the circular polarization radiation source and the electromagnetic reflector.

38. The circular polarization microwave Doppler detection device according to claim 37, wherein the pivot axis of the electromagnetic confinement dam is arranged away from the periphery of the circular polarization radiation source, and the end of the electromagnetic confinement dam away from its pivot axis is bent and extended on the electromagnetic confinement dam and has a curvature corresponding to the periphery of the circular polarization radiation source, so that when the electromagnetic confinement dam is pivotally adjusted, the end of the electromagnetic confinement dam having a curvature corresponding to the periphery of the circular polarization radiation source can approach and move away from the periphery of the circular polarization radiation source in a translational movement manner within a certain distance range.

39. The circular polarization microwave Doppler detection device according to claim 30, wherein in the state where the oscillation unit is powered, the circular polarization radiation source is electrically connected to the reference ground electrode and grounded.

40. The circular polarization microwave Doppler detection device according to claim 39, wherein the circular polarization radiation source has a grounding point, the grounding point is the physical center point of the circular polarization radiation source, and the circular polarization radiation source is electrically connected to the reference ground electrode and grounded at the grounding point.

41. The circular polarization microwave Doppler detection device according to any one of claims 1 to 8 and 16 to 22, wherein the electromagnetic reflector is movably arranged in the radial direction of the circular polarization radiation source.

42. The circular polarization microwave Doppler detection device according to any one of claims 1 to 8 and 16 to 22, wherein the electromagnetic reflector is rotatably arranged around the circular polarization radiation source.

43. The circularly polarized microwave Doppler detection device according to any one of claims 1 to 8 and 16 to 22, wherein the electromagnetic reflector is disposed on a flexible substrate, and the position of the electromagnetic reflector relative to the circularly polarized radiation source is adjusted by adjusting the flexible substrate in a movable manner by means of the flexible characteristics of the flexible substrate.

44. A detection method for a circularly polarized microwave Doppler detection device, characterized in that, it includes the following steps: A. Transmitting at least one circularly polarized detection beam in a circularly polarized manner into a detection space, wherein the circularly polarized detection beam is reflected by an object in the detection space to form a circularly polarized echo; B. Reverse-rotating the circularly polarized echo, wherein the circularly polarized echo is reverse-rotated in a reflected manner to form a circularly polarized reverse-rotated echo; C. Receiving the circularly polarized reverse-rotated echo; and D. Outputting the difference signal, wherein the difference signal corresponds to the difference in characteristic parameters between the circularly polarized detection beam and the circularly polarized reverse-rotated echo.

45. The detection method according to claim 44, wherein the circularly polarized microwave Doppler detection device is provided with a circularly polarized radiation source and an electromagnetic reflector, and in the step (B), the circularly polarized echo is reverse-rotated in a reflected manner by the electromagnetic reflector to form the circularly polarized reverse-rotated echo transmitted to the circularly polarized radiation source.

46. The detection method according to claim 45, wherein in the step (B), it further includes the step of: movably adjusting the electromagnetic reflector.

47. The detection method according to claim 45, wherein the circularly polarized microwave Doppler detection device is provided with at least one electromagnetic dam, and in the step (C), the electromagnetic dam adjusts the receiving degree and range of the circularly polarized radiation source for the corresponding circularly polarized reverse-rotated echo in a manner of attenuation and / or blocking in the transmission path of the corresponding circularly polarized reverse-rotated echo formed by reflection by the electromagnetic reflector and transmitted to the circularly polarized radiation source.

48. The detection method according to claim 47, further including the step of: movably adjusting the electromagnetic dam.

49. The detection method according to any one of claims 44 to 48, wherein the circularly polarized microwave Doppler detection device is provided with a mixing and detection unit, and in the step (D), the mixing and detection unit outputs the difference signal based on the frequency difference between the circularly polarized detection beam and the circularly polarized reverse-rotated echo.

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