Doppler microwave detection device and method for adaptive adjustment of its detection limits

Abstract

The present application provides a Doppler microwave detection device and a detection boundary self-adaptive adjusting method thereof. The Doppler microwave detection device comprises an adjusting input unit, an adjusting control circuit, a feeding circuit, a mixing unit and an antenna unit. The feeding circuit is electrically connected to the mixing unit and is fed to the antenna unit to transmit an excitation signal to the mixing unit in a powered state and to feed the antenna unit with the excitation signal. The adjusting control circuit is connected to the adjusting input unit and the feeding circuit to take the adjusting input unit as a human-computer interaction window of the Doppler microwave detection device. In a state of maintaining the independence of the working frequency and impedance of the feeding circuit, the effective amplitude V I V II of the excitation signal output by the feeding circuit is set in a preset amplitude segment V n .

Description

Technical Field

[0001] This invention relates to the field of Doppler microwave detection, and particularly to a Doppler microwave detection device and a method for adaptive adjustment of its detection boundary. Background Technology

[0002] With the development of IoT technology, artificial intelligence, smart home, and smart security technologies have increasingly higher requirements for the accuracy of environmental detection, especially the detection of human presence, movement, and micro-movement characteristics. Only by obtaining sufficiently stable detection results can accurate judgment be provided for smart terminal devices. Microwave detection technology based on the Doppler effect principle, serving as a crucial link between humans and objects, and between objects themselves, possesses unique advantages in behavior and presence detection technologies. It can transmit a microwave beam at a fixed frequency without infringing on human privacy, and receive the reflected echo formed by the beam's reflection from a corresponding object. Subsequently, a Doppler intermediate frequency (IF) signal corresponding to the frequency difference between the microwave beam and the reflected echo is generated through mixing and detection. The amplitude fluctuation of this IF signal corresponds to the Doppler effect caused by the motion of the corresponding object. Thus, the motion of the corresponding object is characterized based on this IF signal. When applied to the detection of human activity, it can achieve intelligent interconnection between humans and objects through the response of corresponding electrical devices to human activity, thus possessing broad application prospects. However, on the one hand, the boundary of the corresponding microwave beam is non-deterministic due to the gradient boundary where the radiated energy attenuates to a certain degree; on the other hand, there is a lack of effective means to control electromagnetic radiation, i.e., the corresponding microwave... The lack of methods for shaping the gradient boundary of the microwave beam, mainly due to the scarcity of methods for adjusting the beam angle, results in a fixed and difficult-to-control actual detection space for the microwave detection module. This leads to a mismatch between the actual detection space and the corresponding target detection space. Consequently, the target detection space outside the actual detection space cannot be effectively detected, and / or there is environmental interference in the actual detection space outside the target detection space, including motion interference, electromagnetic interference, and self-excited interference caused by electromagnetic shielding. This results in poor accuracy and / or poor anti-interference performance of existing microwave detection technologies based on the Doppler effect. In other words, because the boundary of the microwave beam is a gradient boundary where the radiated energy attenuates to a certain extent, and there is a lack of methods for shaping the gradient boundary of the microwave beam, the actual detection space of the existing microwave detection module is difficult to match the corresponding target detection space in practical applications. This results in the limited adaptability of the existing microwave detection module to different application scenarios and poor detection stability.

[0003] To address the aforementioned shortcomings of existing microwave detection modules, current methods primarily involve selecting a microwave detection module with an actual detection space larger than the corresponding target detection space, and reducing the sensitivity of the microwave detection module by setting a corresponding threshold in amplitude for the Doppler intermediate frequency signal. This reduction in sensitivity aims to eliminate environmental and motion interference in the actual detection space outside the target detection space. However, since the amplitude of the Doppler intermediate frequency signal is related to the energy of the reflected echo and simultaneously to the size of the reflective surface in the environment, the size and speed of the moving object's reflective surface, and the distance between the moving object and the microwave detection module, the reduced sensitivity of the microwave detection module cannot accurately eliminate environmental and motion interference in the actual detection space outside the target detection space. Therefore, the detection of the target detection space is unstable and inaccurate. For example, different moving objects at the same distance from the microwave detection module may have different amplitude feedbacks in the Doppler intermediate frequency signal due to different reflective surface sizes and / or speeds. Conversely, moving objects farther from the microwave detection module may have higher amplitude feedbacks in the Doppler intermediate frequency signal due to their larger reflective surface and / or speed. In other words, the reduced sensitivity of the microwave detection module cannot accurately eliminate environmental and motion interference in the actual detection space outside the target detection space, resulting in unstable and inaccurate detection of the target detection space in practical applications.

[0004] Furthermore, the reduction in the sensitivity of the microwave detection module does not affect the actual detection space of the microwave detection module. Therefore, when the actual detection space of the microwave detection module is larger than the corresponding target detection space, the reduction in the sensitivity of the microwave detection module will not, on the one hand, reduce the power consumption of the microwave detection module, and on the other hand, cause radiation loss outside the target detection space. It is also easy to form self-excited interference in the target detection space, especially when there are highly reflective objects in the target detection space or when the target detection space is a small, non-open space, such as a factory or warehouse with a large number of metal structures.

[0005] In other words, existing methods that select a microwave detection module with an actual detection space larger than the corresponding target detection space and reduce the sensitivity of the microwave detection module to eliminate Doppler intermediate frequency signals generated by environmental and motion interference in the actual detection space outside the target detection space are ineffective. On the one hand, they cannot accurately eliminate environmental and motion interference in the actual detection space outside the target detection space, resulting in unstable and inaccurate detection of the target detection space. On the other hand, they are prone to self-excited interference in the target detection space, causing instability in the operation of the microwave detection module, especially when there are highly reflective objects in the target detection space or when the target detection space is a small, non-open space with walls and the ground. Furthermore, they do not correspondingly reduce the power consumption of the microwave detection module to avoid radiation loss outside the target detection space. Summary of the Invention

[0006] One object of the present invention is to provide a Doppler microwave detection device and its detection boundary adaptive adjustment method, wherein the sensitivity of the Doppler microwave detection device is fixedly set according to a threshold setting of the amplitude of the corresponding Doppler intermediate frequency signal in the frequency spectrum, energy spectrum, power spectrum or amplitude, and the amplitude of the excitation signal of the Doppler microwave detection device can be adjusted to adjust the gradient boundary of the microwave beam based on the correlation between the amplitude of the excitation signal and the energy density distribution of the microwave beam emitted by the Doppler microwave detection device, thereby adjusting the actual detection space of the Doppler microwave detection device bounded by the gradient boundary, which is equivalent to adjusting the sensitivity of the Doppler microwave detection device for the purpose of adjusting the detection range of the Doppler microwave detection device.

[0007] Another objective of this invention is to provide a Doppler microwave detection device and its detection boundary adaptive adjustment method, wherein the amplitude of the excitation signal of the Doppler microwave detection device can be adjusted to adjust the actual detection space of the Doppler microwave detection device bounded by the gradient boundary. This utilizes the characteristic that the attenuation, reflectivity, and transmittance of the microwave beam tend to remain constant in the same dielectric layer. Based on the adjustment of the actual detection space, and in a state where the amplitude of the excitation signal in the actual detection space is adapted to the target detection space defined by a wall, glass, or metal plate layer, the field strength of the microwave beam outside the target detection space is reduced. This is beneficial for eliminating environmental and motion interference outside the target detection space based on the adjustment of the amplitude of the excitation signal.

[0008] Another objective of this invention is to provide a Doppler microwave detection device and its detection boundary adaptive adjustment method, wherein the amplitude of the excitation signal of the Doppler microwave detection device can be adjusted to adjust the actual detection space of the Doppler microwave detection device bounded by the gradient boundary. This utilizes the characteristic that the attenuation, reflectivity, and transmittance of the microwave beam tend to remain constant in the same dielectric layer. Based on the adjustment of the actual detection space, and in a state where the adjustment of the excitation signal amplitude in the actual detection space is adapted to the target detection space defined by a wall, glass, or metal plate layer, the field strength of the microwave beam outside the target detection space is reduced. This correspondingly helps to reduce the electromagnetic interference of the Doppler microwave detection device outside the target detection space based on the adjustment of the excitation signal amplitude.

[0009] Another object of the present invention is to provide a Doppler microwave detection device and its detection boundary adaptive adjustment method, wherein, based on the adjustment of the actual detection space, in a state where the amplitude of the excitation signal in the actual detection space is adapted to the target detection space, the intensity of the echo signal formed by the reflection of the microwave beam by the walls, glass or metal plates of the target detection space can be reduced. This is beneficial for reducing the probability of self-excitation interference generated by the Doppler microwave detection device based on multipath reflection, in the presence of highly reflective objects in the target detection space and in the state where the target detection space is a small, non-open space, based on the adjustment of the amplitude of the excitation signal.

[0010] Another object of the present invention is to provide a Doppler microwave detection device and an adaptive adjustment method for its detection boundary, wherein, based on the adjustment of the amplitude of the excitation signal, compared with the independent use of sensitivity adjustment, the actual detection space can be adjusted, which is beneficial to reduce radiation loss outside the target detection space, and correspondingly beneficial to reduce the radiation power consumption of the microwave detection device.

[0011] Another objective of this invention is to provide a Doppler microwave detection device and its adaptive adjustment method for the detection boundary. Based on the adjustment of the amplitude of the excitation signal, compared with the independent sensitivity adjustment method, the actual detection space can be adjusted to have a relatively clear detection boundary, which is beneficial to ensuring the stability and accuracy of the Doppler microwave detection device in actual detection applications.

[0012] Another object of the present invention is to provide a Doppler microwave detection device and an adaptive adjustment method for its detection boundary, wherein the Doppler microwave detection device includes a feed circuit and an adjustment control circuit, wherein the adjustment control circuit is connected to the feed circuit and is preset with multiple levels corresponding to the corresponding circuit parameters of the adjustment control circuit, so as to select and set the effective amplitude of the excitation signal output by the feed circuit in a preset amplitude range based on the corresponding level of the adjustment control circuit.

[0013] Another objective of this invention is to provide a Doppler microwave detection device and its detection boundary adaptive adjustment method, wherein the corresponding graded selection of the adjustment control circuit will neither change the frequency of the excitation signal output by the feed circuit nor affect the impedance matching between the feed circuit and the corresponding antenna element. That is, the connection relationship between the adjustment control circuit and the feed circuit can maintain the independence of the operating frequency and impedance of the feed circuit, and is therefore suitable for microwave detection based on the Doppler effect principle.

[0014] Another objective of this invention is to provide a Doppler microwave detection device and its detection boundary adaptive adjustment method, wherein the connection relationship between the adjustment control circuit and the feed circuit can maintain the independence of the operating frequency and impedance of the feed circuit, so that the corresponding hierarchical selection of the adjustment control circuit will not change the output efficiency of the excitation signal output by the feed circuit. Thus, the radiation power consumption of the microwave detection device can be adjusted with the same output efficiency based on the corresponding hierarchical selection of the adjustment control circuit, thereby reducing the overall power consumption of the microwave detection device in a state where the adjustment of the amplitude of the excitation signal in the actual detection space is adapted to the target detection space.

[0015] Another objective of this invention is to provide a Doppler microwave detection device and its detection boundary adaptive adjustment method. In contrast to independently using sensitivity adjustment, by adjusting the amplitude of the excitation signal, the actual detection space bounded by the gradient boundary can be adjusted based on changes in the gradient boundary. The adaptation relationship between different levels of the adjustment control circuit and the target detection space under corresponding scenarios or sizes can be intuitively illustrated based on the adaptability of the actual detection space to the corresponding target detection space. This allows users to easily select the appropriate level of the adjustment control circuit for different scenarios or sizes based on the adaptation relationship between the different levels of the adjustment control circuit and the target detection space under corresponding scenarios or sizes, thus facilitating the widespread adoption of the Doppler microwave detection device even in microwave-invisible environments.

[0016] Another object of the present invention is to provide a Doppler microwave detection device and a method for adaptively adjusting the detection boundary therebetween, wherein the effective amplitude V of the excitation signal fed to the antenna element is used as the reference value. n As a variable, the effective amplitude V of the excitation signal is determined based on the energy density distribution of the microwave beam. n The response to the change, and the amplitude segment V of the excitation signal corresponding to the linear change of the response. I V II The effective amplitude V of the excitation signal is... n The gradient boundary of the actual detection space is selected by adjusting or setting the gradient, wherein the energy density distribution of the microwave beam affects the amplitude range V. I V II The responsiveness of the amplitude V of the excitation signal in the segment tends to change linearly, and the energy efficiency of the microwave detection device can be guaranteed.

[0017] Another objective of this invention is to provide a Doppler microwave detection device and its adaptive adjustment method for the detection boundary, wherein the Doppler microwave detection device has a preset noise floor value, and based on the relatively high correlation between the energy density distribution of the microwave beam and the detection direction of the Doppler microwave detection device and the amplitude of the excitation signal, in the state where the target detection space is unoccupied, in the amplitude range V of the excitation signal... I V II The effective amplitude V of the excitation signal is adaptively adjusted from large to small. n And read the effective amplitude V of the corresponding excitation signal. n The noise floor value of the Doppler intermediate frequency signal is determined such that when the noise floor value of the Doppler intermediate frequency signal is less than or equal to the preset noise floor value, the amplitude V of the corresponding excitation signal is adjusted. H To accommodate the maximum amplitude of the excitation signal in the current environment, it is advantageous to subsequently set the effective amplitude V of the excitation signal based on the boundary of the target detection space. n When making adjustments, the controllable range of the boundary of the target detection space is ensured and the radiation loss outside the target detection space is reduced.

[0018] Another object of the present invention is to provide a Doppler microwave detection device and its adaptive adjustment method for the detection boundary, wherein, in the state where no one is in the target detection space, the amplitude range V of the excitation signal is adjusted accordingly. I V II Section V H The effective amplitude V of the excitation signal is adjusted from large to small to set the maximum amplitude limit. n And read the effective amplitude V of the corresponding excitation signal. nThe noise floor value of the Doppler intermediate frequency signal is used as the ambient noise floor value, and the ambient noise floor value of the Doppler intermediate frequency signal is used as the ambient noise floor value to establish the current ambient noise floor value and the effective amplitude V of the corresponding excitation signal. n The corresponding information between them is used to adaptively set the target detection space in subsequent steps based on the location of the moving object (such as a waving or walking human body) as the boundary of the target detection space, in the state where a moving object exists in the target detection space, during the amplitude segment V of the excitation signal. I V II Section V H The effective amplitude V of the excitation signal is adjusted from small to large to set the maximum amplitude limit. n And read the effective amplitude V of the corresponding excitation signal. n The amplitude A of the Doppler intermediate frequency signal in the frequency spectrum, energy spectrum, power spectrum, or amplitude is compared with the effective amplitude V of the corresponding excitation signal. n When there is a difference in the corresponding environmental noise floor value, the amplitude V of the corresponding excitation signal is used. L To match the minimum amplitude of the target detection space, so that it is possible to base the excitation signal on the amplitude range V L V H At least one effective amplitude V of the segment n The setting enables adaptive configuration of the target detection space, with the location of the moving object as the boundary.

[0019] According to one aspect of the present invention, a Doppler microwave detection device is provided, the Doppler microwave detection device comprising:

[0020] One adjustment input unit;

[0021] An adjustment control circuit, wherein the adjustment control circuit includes an input recognition unit, a logic processing unit and a communication interface unit, wherein the input recognition unit is electrically connected to the adjustment input unit and the logic processing unit to recognize the input information of the adjustment input unit and transmit digital information corresponding to the input information to the logic processing unit;

[0022] A power supply circuit, wherein the power supply circuit is configured in the form of an integrated circuit and includes a communication interface module, a digital logic processing unit, a voltage-controlled oscillator (VCO) unit, and an excitation signal amplitude adjustment unit. The VCO unit is pre-configured with corresponding hierarchical control commands that can be recognized by the digital logic processing unit and is electrically connected to the communication interface unit to retrieve the corresponding hierarchical control commands based on digital information received from the input recognition unit and transmit them to the communication interface unit. The communication interface module is electrically connected to the communication interface unit to receive the corresponding hierarchical control commands from the communication interface unit. The VCO unit is simultaneously electrically connected to both the digital logic processing unit and the excitation signal amplitude adjustment unit to output an excitation signal of a corresponding frequency to the excitation signal amplitude adjustment unit under the control of the digital logic processing unit. The digital logic processing unit is electrically connected to both the communication interface module and the excitation signal amplitude adjustment unit to receive the corresponding hierarchical control commands from the communication interface module and, based on the received hierarchical control commands, control the excitation signal amplitude adjustment unit to adjust the effective amplitude of the excitation signal.

[0023] A mixer unit; and

[0024] An antenna unit, wherein the antenna unit is electrically connected to the mixer unit and fed to the excitation signal amplitude adjustment unit, so as to transmit a microwave beam corresponding to the frequency of the excitation signal in a state fed by the excitation signal output by the excitation signal amplitude adjustment unit to form an actual detection space, and receive a reflected echo formed by the microwave beam being reflected by a corresponding object in the actual detection space, so as to transmit an echo signal corresponding to the reflected echo to the mixer unit, wherein the mixer unit is further electrically connected to the voltage-controlled oscillator unit to receive the excitation signal output from the voltage-controlled oscillator unit, and is configured to output a Doppler intermediate frequency signal corresponding to the frequency / phase difference between the excitation signal and the echo signal in a mixing detection manner.

[0025] In one embodiment, the excitation signal amplitude adjustment unit includes at least two branch adjustment circuits, each branch adjustment circuit including a first MOS transistor and a second MOS transistor. The source of the first MOS transistor in the same branch adjustment circuit is electrically connected to the drain of the second MOS transistor. The gate of the second MOS transistor in each branch adjustment circuit is electrically connected to the voltage-controlled oscillator unit. The source of the second MOS transistor in each branch adjustment circuit is grounded. The drain of the first MOS transistor in each branch adjustment circuit is electrically connected to the antenna unit and connected to the positive terminal of the power supply via a resistor / inductor. The gate of the first MOS transistor in each branch adjustment circuit is electrically connected to the digital logic processing unit. This allows for effective amplitude adjustment of the excitation signal output by the excitation signal amplitude adjustment unit by controlling the conduction and cutoff of the first MOS transistor in the corresponding branch adjustment circuit based on the input information transformation of the adjustment input unit.

[0026] In one embodiment, the excitation signal amplitude adjustment unit includes at least two branch adjustment circuits, each branch adjustment circuit including a first MOS transistor and a second MOS transistor. The source of the first MOS transistor in the same branch adjustment circuit is electrically connected to the drain of the second MOS transistor. The gate of the second MOS transistor in each branch adjustment circuit is electrically connected to the voltage-controlled oscillator unit. The source of the second MOS transistor in each branch adjustment circuit is grounded. The drain of the first MOS transistor in each branch adjustment circuit is electrically connected to the antenna unit and connected to the positive terminal of the power supply via a resistor / inductor. The gate of the first MOS transistor in each branch adjustment circuit is electrically connected to the digital logic processing unit. The second MOS transistors in each branch adjustment circuit are equivalently arranged as at least two MOS transistors connected in parallel. Based on the corresponding input information transformation of the adjustment input unit, the on / off control of the first MOS transistor in the corresponding branch adjustment circuit is realized to achieve effective amplitude adjustment of the excitation signal output by the excitation signal amplitude adjustment unit.

[0027] In one embodiment, the excitation signal amplitude adjustment unit includes at least two branch adjustment circuits, each branch adjustment circuit including a first MOSFET and a second MOSFET, wherein the source of the first MOSFET in the same branch adjustment circuit is electrically connected to the drain of the second MOSFET, the gate of the second MOSFET in each branch adjustment circuit is electrically connected to the voltage-controlled oscillator unit, the source of the second MOSFET in each branch adjustment circuit is grounded, the drain of the first MOSFET in each branch adjustment circuit is connected to the positive terminal of the power supply via a first inductor, each first inductor is coupled to a second inductor, wherein the second inductor is connected in parallel to the mutually coupled... One of the two third inductors, wherein the third inductor connected in parallel with the second inductor is grounded, and one end of the other third inductor is electrically connected to the antenna element, and the other end is grounded, to form an electrically coupled connection between the drain of the first MOS transistor of each branch adjustment circuit and the antenna element, wherein the gate of the first MOS transistor of each branch adjustment circuit is electrically connected to the digital logic processing unit, so as to realize the on and off control of the first MOS transistor of the corresponding branch adjustment circuit based on the corresponding input information transformation of the adjustment input unit, thereby realizing the effective amplitude adjustment of the excitation signal output by the excitation signal amplitude adjustment unit.

[0028] In one embodiment, the excitation signal amplitude adjustment unit includes at least two branch adjustment circuits, each branch adjustment circuit including a branch MOS transistor and a branch inductor / resistor. One end of the branch inductor / resistor of the same branch adjustment circuit is electrically connected to the drain of the branch MOS transistor, and the other end of the branch inductor / resistor of each branch adjustment circuit is electrically connected to the voltage-controlled oscillator unit and the antenna unit, and connected to the positive terminal of the power supply via a resistor / inductor. The source of the branch MOS transistor of each branch adjustment circuit is grounded, and the gate of the branch MOS transistor of each branch adjustment circuit is electrically connected to the digital logic processing unit. This allows for effective amplitude adjustment of the excitation signal output by the excitation signal amplitude adjustment unit by controlling the conduction and cutoff of the branch MOS transistor of the corresponding branch adjustment circuit based on the input information transformation of the adjustment input unit.

[0029] In one embodiment, the excitation signal amplitude adjustment unit includes at least two branch adjustment circuits, each branch adjustment circuit including a branch resistor / inductor, a first MOSFET, and a second MOSFET. The source of the first MOSFET in the same branch adjustment circuit is electrically connected to the drain of the second MOSFET, and the drain of the first MOSFET in the same branch adjustment circuit is connected to the positive terminal of the power supply via the branch resistor / inductor. The gate of the second MOSFET in each branch adjustment circuit is electrically connected to the voltage-controlled oscillator unit, and the source of the second MOSFET in each branch adjustment circuit is electrically connected to the antenna unit and grounded via a resistor / inductor. The gate of the first MOSFET in each branch adjustment circuit is electrically connected to the digital logic processing unit. This allows for effective amplitude adjustment of the excitation signal output by the excitation signal amplitude adjustment unit by controlling the conduction and cutoff of the first MOSFET in the corresponding branch adjustment circuit based on the input information transformation of the adjustment input unit.

[0030] In one embodiment, based on the correspondence between the gate, drain, and source of a MOS transistor and the base, collector, and emitter of a bipolar transistor, at least one of the MOS transistors in the excitation signal amplitude adjustment unit is replaced with a bipolar transistor.

[0031] In one embodiment, the Doppler microwave detection device further includes an intermediate frequency (IF) amplification unit and a signal processing unit. The IF amplification unit is electrically connected to the mixing unit to receive the Doppler IF signal from the mixing unit and amplify the received Doppler IF signal. The signal processing unit is electrically connected to the IF amplification unit to extract effective features of the Doppler IF signal based on a corresponding threshold setting. The logic processing unit is electrically connected to the signal processing unit to output corresponding control information according to the effective features of the Doppler IF signal extracted by the signal processing unit.

[0032] In one embodiment, the Doppler microwave detection device further includes a control unit, wherein the control unit is electrically connected to the logic processing unit to access the control information output by the logic processing unit, and outputs a corresponding control signal to the corresponding electrical equipment or performs a corresponding control action to control the working state of the corresponding electrical equipment when the corresponding control information is accessed.

[0033] In one embodiment, the signal processing unit and the adjustment control circuit are respectively configured as integrated circuits and integrated into a single MCU, and the mixing unit and the intermediate frequency amplification unit are respectively configured as integrated circuits and integrated into a single microwave chip with the power supply circuit.

[0034] In one embodiment, the signal processing unit and the adjustment control circuit are respectively configured as integrated circuits and integrated into a single MCU, the intermediate frequency amplification unit is configured as an integrated circuit and integrated into a single microwave chip with the power supply circuit, and the mixer unit is externally located on the microwave chip.

[0035] In one embodiment, the adjustment input unit is selected from a mechanical switch input device combination consisting of a DIP switch, an coded switch, a multi-position switch, and a toggle switch.

[0036] In one embodiment, the adjustment input unit is configured as an adjustable potentiometer.

[0037] In one embodiment, the adjustment input unit is configured as a digital signal access device.

[0038] According to another aspect of the present invention, the present invention also provides a method for adaptive adjustment of the detection boundary of a Doppler microwave detection device, the method comprising the following steps:

[0039] S1. In a state where the target detection space is unmanned, a preset amplitude segment V of an excitation signal is used. I V II The effective amplitude V of the excitation signal is adaptively adjusted from large to small. n ;

[0040] S2. Read the effective amplitude V of the corresponding excitation signal. n The noise floor A of the Doppler intermediate frequency signal in terms of frequency spectrum, energy spectrum, power spectrum, or amplitude. k And compare the noise floor value A of the read Doppler intermediate frequency signal. k With a preset noise floor value A0, the noise floor value A of the read Doppler intermediate frequency signal is... k When the noise floor value is less than or equal to the preset noise floor value A0, the amplitude V of the corresponding excitation signal is used. H The maximum amplitude of the excitation signal is determined to be suitable for the current environment, and the noise floor value A of the read Doppler intermediate frequency signal is also considered. k Let A be the ambient noise floor value, and establish the ambient noise floor value A under the current environment. k The amplitude range V of the excitation signal I V H Effective amplitude V n The corresponding information;

[0041] S3, In the state where there is a moving object in the target detection space, in the amplitude segment V I V H Adjust the effective amplitude V of the excitation signal from small to largen ;

[0042] S4. Read the effective amplitude V of the corresponding excitation signal. n The amplitude A of the Doppler intermediate frequency signal in the frequency spectrum, energy spectrum, power spectrum, or amplitude is measured, and the amplitude A of the Doppler intermediate frequency signal is compared with the effective amplitude V of the corresponding excitation signal. n The corresponding ambient noise level A k The amplitude A of the Doppler intermediate frequency signal read is greater than the effective amplitude V of the corresponding excitation signal. n The corresponding ambient noise level A k At that time, the amplitude V of the corresponding excitation signal is... L To match the minimum amplitude in the target detection space, the amplitude range V is determined. L V H The effective amplitude V of the excitation signal is adapted to the current environment. n The adjustment range; and

[0043] S5, in the amplitude range V of the excitation signal L V H Set the effective amplitude V of the excitation signal n .

[0044] In one embodiment, the Doppler microwave detection device includes a feed circuit, a mixer unit, and an antenna unit. The feed circuit is configured as an integrated circuit and includes a digital logic processing unit, a voltage-controlled oscillator (VCO) unit, and an excitation signal amplitude adjustment unit. The VCO unit is electrically connected to both the digital logic processing unit and the excitation signal amplitude adjustment unit, and outputs an excitation signal of a corresponding frequency to the excitation signal amplitude adjustment unit under the control of the digital logic processing unit. The excitation signal amplitude adjustment unit is electrically connected to the antenna unit and electrically connected to the digital logic processing unit under the control of the digital logic processing unit, and adjusts the signal input from the VCO unit under the control of the digital logic processing unit. The effective amplitude of the excitation signal is adjusted and fed to the antenna element, wherein the antenna element is electrically connected to the mixer unit to transmit a microwave beam corresponding to the frequency of the excitation signal in a state fed by the excitation signal output by the excitation signal amplitude adjustment unit to form an actual detection space, and to receive a reflected echo formed by the microwave beam being reflected by a corresponding object in the actual detection space and transmit an echo signal corresponding to the reflected echo to the mixer unit, wherein the mixer unit is further electrically connected to the voltage-controlled oscillator unit to receive the excitation signal output from the voltage-controlled oscillator unit and output a Doppler intermediate frequency signal corresponding to the frequency / phase difference between the excitation signal and the echo signal in a mixing detection manner.

[0045] In one embodiment, the Doppler microwave detection device further includes an adjustment input unit and an adjustment control circuit. The adjustment control circuit includes an input identification unit, a logic processing unit, and a communication interface unit. The input identification unit is electrically connected to the adjustment input unit and the logic processing unit to identify the input information of the adjustment input unit and transmit digital information corresponding to the input information to the logic processing unit. The logic processing unit is pre-loaded with corresponding hierarchical control commands that can be recognized by the digital logic processing unit and is electrically connected to the communication interface unit to retrieve the corresponding hierarchical control commands based on the digital information received from the input identification unit and transmit them to the communication interface unit. The power supply circuit further includes a communication interface module. The communication interface module is electrically connected to the communication interface unit to receive the corresponding hierarchical control commands from the communication interface unit. The digital logic processing unit is electrically connected to the communication interface module to receive the corresponding hierarchical control commands from the communication interface module and, based on the received hierarchical control commands, control the excitation signal amplitude adjustment unit to adjust the effective amplitude of the excitation signal input from the voltage-controlled oscillator unit.

[0046] The further objects and advantages of the invention will become fully apparent from the following description and accompanying drawings.

[0047] These and other objects, features and advantages of the present invention will be fully realized through the following detailed description, drawings and claims. Attached Figure Description

[0048] Figure 1A This is a schematic block diagram of a Doppler microwave detection device according to an embodiment of the present invention when using a transmit-receive antenna unit.

[0049] Figure 1B This is a schematic block diagram of the Doppler microwave detection device according to the above embodiments of the present invention when using a transmit / receive separate antenna unit.

[0050] Figure 2A This is a schematic structural block diagram of an integrated form of the Doppler microwave detection device according to the above embodiments of the present invention.

[0051] Figure 2B This is a schematic diagram of another integrated form of the Doppler microwave detection device according to the above embodiments of the present invention.

[0052] Figure 3A This is a schematic diagram of a portion of the circuit structure of the Doppler microwave detection device according to the above embodiments of the present invention, which implements amplitude adjustment of the excitation signal.

[0053] Figure 3B This is a schematic diagram of a portion of the circuit structure of the Doppler microwave detection device according to the above embodiments of the present invention, which implements amplitude adjustment of the excitation signal.

[0054] Figure 3C This is a schematic diagram of a portion of the circuit structure of the Doppler microwave detection device according to the above embodiments of the present invention, which implements amplitude adjustment of the excitation signal.

[0055] Figure 3D This is a schematic diagram of a portion of the circuit structure of the Doppler microwave detection device according to the above embodiments of the present invention, which implements amplitude adjustment of the excitation signal.

[0056] Figure 3E This is a schematic diagram of a portion of the circuit structure of the Doppler microwave detection device according to the above embodiments of the present invention, which implements amplitude adjustment of the excitation signal.

[0057] Figure 4 The energy density distribution of the microwave beam emitted by the Doppler microwave detection device according to the above embodiments of the present invention affects the effective amplitude V of the excitation signal. n A schematic diagram of the response curve to the change.

[0058] Figure 5 This is a schematic diagram showing the variation of the actual detection space of the Doppler microwave detection device according to the above embodiments of the present invention with the effective amplitude Vn of the excitation signal.

[0059] Figure 6 This is a schematic diagram of the logic block diagram of an adaptive adjustment method for the detection boundary of a Doppler microwave detection device according to an embodiment of the present invention.

[0060] Figure 7 A schematic diagram showing the adaptation relationship between the target detection space and the actual detection space under different combinations of detection height and detection area.

[0061] Figure 8A This is a schematic diagram illustrating the application scenario of the Doppler microwave detection device of the present invention in a confined space where the target detection space is small.

[0062] Figure 8B This is a schematic diagram illustrating the application scenario of the Doppler microwave detection device of the present invention in the presence of an object with a high reflectivity in the corresponding target detection space.

[0063] Figure 8C This is a schematic diagram illustrating the application scenario of the Doppler microwave detection device of the present invention in the presence of interference in the corresponding target detection space. Detailed Implementation

[0064] The following description is intended to disclose the present invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0065] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0066] In this invention, the term "a" in the claims and specification should be understood as "one or more," that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. Unless explicitly indicated in the disclosure of this invention that the number of the element is only one, the term "a" should not be construed as unique or single, and the term "a" should not be construed as a limitation on the quantity.

[0067] In the description of this invention, it should be understood that terms such as "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, terms such as "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through a medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0069] Referring to the accompanying drawings of this invention Figure 1A and Figure 1BAs shown, a structural block diagram of a Doppler microwave detection device according to an embodiment of the present invention is illustrated. The Doppler microwave detection device includes an adjustment input unit 10, an adjustment control circuit 20, a feed circuit 30, a mixer unit 40, and an antenna unit 100. The feed circuit 30 is configured as an integrated circuit and electrically connected to the mixer unit 40 and fed to the antenna unit 100. In a powered state, it transmits an excitation signal to the mixer unit 40 and feeds the antenna unit 100 with the excitation signal. In the fed state, the antenna unit 100 transmits signals corresponding to the excitation signal. A microwave beam of a certain frequency is used to form an actual detection space, and a reflected echo formed by the microwave beam being reflected by a corresponding object in the actual detection space is received. An echo signal corresponding to the reflected echo is transmitted to the mixing unit 40. The mixing unit 40 outputs a Doppler intermediate frequency signal corresponding to the frequency / phase difference between the excitation signal and the echo signal in a mixing detection manner. The adjustment control circuit 20 is connected to the feed circuit 30 and is preset with multiple levels corresponding to the circuit parameters of the adjustment control circuit 20, so as to select a preset amplitude range V based on the corresponding level of the adjustment control circuit 20. I V II The effective amplitude V of the excitation signal output by the feed circuit 30 is set in the section. n .

[0070] Specifically, corresponding to Figure 1A The antenna element 100 is exemplified in a transmit-receive configuration. Corresponding to the state where the antenna element 100 is electrically connected to the feed circuit 30 while being fed by the feed circuit 30, it transmits the microwave beam as a transmitting antenna and simultaneously receives the reflected echo formed by the microwave beam reflected by a corresponding object in the actual detection space, and transmits the echo signal corresponding to the reflected echo to the mixer unit 40. Figure 1BThe antenna unit 100 is configured in a transmit / receive split configuration. Correspondingly, the antenna unit 100 is electrically connected to the mixing unit 40 while being fed to the feeding circuit 30. Specifically, unlike the transmit / receive combined configuration where the antenna unit 100 has a single feed point fed to the feeding circuit 30 and electrically connected to the mixing unit 40, in the transmit / receive split configuration, the antenna unit 100 has a transmit feed point fed to the feeding circuit 30 and a receive feed point electrically connected to the mixing unit 40. The transmit feed point is fed by the feeding circuit 30, and the receive feed point transmits the echo signal corresponding to the reflected echo to the mixing unit 40.

[0071] It is worth mentioning that, in these embodiments of the present invention, the antenna element 100 can correspond to... Figure 1A Antennas employing a combined transmit and receive configuration can also correspond to Figure 1B The present invention does not limit the use of antennas with separate transmit and receive configurations.

[0072] Further, the adjustment control circuit 20 includes an input identification unit 21, a logic processing unit 22, and a communication interface unit 23. The power supply circuit 30 includes a communication interface module 31, a digital logic processing unit 32, a voltage-controlled oscillator unit 33, and an excitation signal amplitude adjustment unit 34. The adjustment input unit 10 is electrically connected to the input identification unit 21 of the adjustment control circuit 20. The input identification unit 21 is electrically connected to the logic processing unit 22 to identify the input information of the adjustment input unit 10 and transmit corresponding digital information to the logic processing unit 22. The logic processing unit 22 is pre-set with corresponding hierarchical control commands that can be recognized by the digital logic processing unit 32 of the power supply circuit 30 and is electrically connected to the communication interface unit 23 to adjust the data received from the input identification unit 21. The corresponding hierarchical control command is retrieved from the information and transmitted to the communication interface unit 23. The communication interface module 31 of the power supply circuit 30 is electrically connected to the communication interface unit 23 of the adjustment control circuit 20 to receive the corresponding hierarchical control command from the communication interface unit 23. The voltage-controlled oscillator unit 33 is simultaneously electrically connected to the digital logic processing unit 32 and the excitation signal amplitude adjustment unit 34, so as to output the excitation signal of the corresponding frequency to the excitation signal amplitude adjustment unit 34 under the control of the digital logic processing unit 32. The digital logic processing unit 32 is electrically connected to the communication interface module 31 and the excitation signal amplitude adjustment unit 34 to receive the corresponding hierarchical control command from the communication interface module 31 and control the excitation signal amplitude adjustment unit 34 to adjust the effective amplitude V of the excitation signal according to the received hierarchical control command. n The system is adjusted such that the excitation signal amplitude adjustment unit 34 is fed to the antenna unit 100 to transmit the amplitude-adjusted excitation signal to the antenna unit 100, thereby powering the antenna unit 100. Corresponding to the state where the antenna unit 100 is powered by the excitation signal output by the excitation signal amplitude adjustment unit 34, it transmits a microwave beam corresponding to the frequency of the excitation signal to form the actual detection space, and receives the reflected echo formed by the microwave beam reflected by corresponding objects in the actual detection space, so as to transmit the echo signal corresponding to the reflected echo to the mixing unit 40. The mixing unit 40 is further electrically connected to the voltage-controlled oscillator unit 33 to receive the excitation signal output from the voltage-controlled oscillator unit 33, and is configured to output the Doppler intermediate frequency signal corresponding to the frequency / phase difference between the excitation signal and the echo signal in a mixing detection manner.

[0073] It is worth mentioning that, based on the above-described structural form of the Doppler microwave detection device, the effective amplitude selection of the excitation signal output by the feed circuit 30 in the form of a high-frequency integrated circuit is achieved by transforming the corresponding input information of the adjustment input unit 10. This will not change the frequency of the excitation signal output by the feed circuit 30, nor will it affect the impedance matching between the feed circuit 30 and the antenna unit 100. That is, the above-described connection relationship between the adjustment input unit 10, the adjustment control circuit 20 and the feed circuit 30 can maintain the independence of the operating frequency and impedance of the feed circuit 30, and is therefore suitable for microwave detection based on the Doppler effect principle.

[0074] Furthermore, the aforementioned connection relationship between the adjustment input unit 10, the adjustment control circuit 20, and the feed circuit 30 can maintain the independence of the operating frequency and impedance of the feed circuit 30. Therefore, the corresponding grade selection of the adjustment control circuit 20 will not change the output efficiency of the excitation signal output by the feed circuit 30. In this way, the radiation power consumption of the microwave detection device can be adjusted with the same output efficiency based on the corresponding grade selection of the adjustment control circuit 20. This allows the adjustment of the amplitude of the excitation signal in the actual detection space to match the target detection space, thereby reducing the overall power consumption of the microwave detection device.

[0075] Specifically, in this embodiment of the invention, the adjustment input unit 10 can be configured as a mechanical switch input device, a digital signal access device, or an analog switch input device, serving as the human-machine interface window of the Doppler microwave detection device. The effective amplitude of the excitation signal output by the feed circuit 30 in the form of a high-frequency device is adjusted by switching the input information of the adjustment input unit 10. The specific form of the adjustment input unit 10 does not constitute a limitation of the invention. Mechanical switch input devices include DIP switches, coded switches (e.g., BCD coded switches), multi-position switches, and toggle switches. Digital signal access devices include wireless RF modules, such as infrared remote control modules, 433MHz, 868MHz, 2.4GHz Wi-Fi, Bluetooth, Zigbee, NFC, carrier communication, etc., and also include wired digital modules, such as DALI, KNX, CAN BUS, RS485, RS232 modules, etc. Analog switch input devices include adjustable potentiometers.

[0076] Furthermore, in this embodiment of the invention, the Doppler microwave detection device further includes an intermediate frequency (IF) amplification unit 50 and a signal processing unit 60. The IF amplification unit 50 is electrically connected to the mixing unit 40 to receive the Doppler IF signal from the mixing unit 40 and amplify the received Doppler IF signal. The signal processing unit 60 is electrically connected to the IF amplification unit 50 to extract effective features of the Doppler IF signal based on corresponding threshold settings, such as corresponding threshold settings for the Doppler IF signal in frequency, frequency change rate, phase, phase change rate, amplitude, or amplitude change rate, and / or corresponding threshold settings for the amplitude of the Doppler IF signal in frequency spectrum, energy spectrum, or power spectrum. The logic processing unit 22 of the adjustment control circuit 20 is further electrically connected to the signal processing unit 60 to output corresponding control information based on the effective features of the Doppler IF signal extracted by the signal processing unit 60 according to corresponding logic rules.

[0077] Specifically, in this embodiment of the invention, the Doppler microwave detection device further includes a control unit 70, wherein the control unit 70 is electrically connected to the logic processing unit 22 to access the control information output by the logic processing unit 22, and outputs corresponding control signals to the corresponding electrical equipment or performs corresponding control actions to control the working state of the corresponding electrical equipment when the corresponding control information is accessed. For example, when the control unit 70 is set to output control signals for the corresponding electrical equipment, it outputs corresponding control signals to control the corresponding electrical equipment, and when the control unit 70 is set to an electronic switch or a controllable transformer / converter, it performs switching operations or transformer / converter operations to control the working state of the corresponding electrical equipment, thereby realizing the intelligent response of the corresponding electrical equipment to the corresponding actions based on the effective characteristics of the Doppler intermediate frequency signal to the characterization of the corresponding actions of the human (object) body.

[0078] It is worth mentioning that, in some embodiments of the present invention, at least one filtering unit is further provided between the mixing unit 40 and the intermediate frequency amplification unit 50 and / or between the intermediate frequency amplification unit 50 and the signal processing unit 60. The filtering unit is configured in either analog or digital circuit form. When the filtering unit is configured in analog circuit form, it is configured as an analog filter comprising capacitors, resistors, inductors, and integrated filter circuits. The type of analog filter is not limited; it can be selected from one or a combination of LC and RC, such as a low-pass filter, high-pass filter, band-pass filter, band-stop filter, dielectric filter, active filter, passive filter, or one or more combinations of other analog filters known to those skilled in the art. When the filtering unit is configured in digital circuit form, it is configured as a digital filter comprising an ADC conversion module, a central processing unit (CPU), and a DAC conversion module. The ADC conversion module, CPU, and DAC conversion module are communicatively connected to each other, and the CPU provides the hardware environment for running digital filter algorithms. Alternatively, the ADC conversion module and the DAC conversion module are integrated into the CPU. Those skilled in the art should understand that the specific hardware configuration and algorithm of the digital filter are not limited. For example, but not limited to, the digital filter may be configured to support the operation of the corresponding algorithm software, such as MCU, DSP, FPGA, external high-precision ADC integrated chip, digital logic unit chip composed of operational amplifier, or one or more of the chips known to those skilled in the art. The corresponding algorithms include, but are not limited to, Butterworth filter algorithm, Fourier (FFT / DFT) algorithm, Kalman filter algorithm, finite impulse response filter, non-recursive filter (FIR) algorithm, Hilbert-Huang transform (HHT), linear system transform, wavelet transform, infinite impulse response filter, recursive filter (IIR) algorithm, or one or more of the algorithms known to those skilled in the art.

[0079] It is understood that the corresponding circuits of the Doppler microwave detection device can be integrated in different combinations when configured as integrated circuits, and the present invention does not limit this. For example, in some embodiments of the present invention, the figures in the specification of the present invention are shown. Figure 2AAs shown, the signal processing unit 60 is configured as an integrated circuit and integrated with the adjustment and control circuit 20 into a single MCU. The mixer unit 40 and the intermediate frequency amplifier unit 50 are respectively configured as integrated circuits and integrated with the power supply circuit 30 into a single microwave chip. In other embodiments of the present invention, the drawings corresponding to the specifications of the present invention are... Figure 2B As shown, the signal processing unit 60 is configured as an integrated circuit and integrated with the adjustment and control circuit 20 as an MCU, the intermediate frequency amplification unit 50 is configured as an integrated circuit and integrated with the power supply circuit 30 as a microwave chip, wherein the mixer unit 40 is externally located on the microwave chip.

[0080] In particular, in some embodiments of the present invention, when the mixing unit 40 and the intermediate frequency amplification unit 50 are respectively configured as integrated circuits and integrated with the feed circuit 30 as a microwave chip, or when the intermediate frequency amplification unit 50 is configured as an integrated circuit and integrated with the feed circuit 30 as a microwave chip, the antenna unit 100 is integrated and packaged in the microwave chip.

[0081] Furthermore, it can be understood that the multiple preset levels corresponding to the corresponding circuit parameters of the adjustment control circuit 20 in the adjustment control circuit 20 can be either a finite number of levels or a series of levels, so as to select the corresponding level of the adjustment control circuit 20 based on the corresponding state adjustment of the adjustment input unit 10 in the preset amplitude range V. I V II The effective amplitude V of the excitation signal output by the power supply circuit 30 can be set in segments or steplessly. n .

[0082] To further understand the present invention, please refer to the accompanying drawings in the specification of the present invention. Figures 3A to 3C As shown, different circuit structures of the excitation signal amplitude adjustment unit 34 in the power supply circuit 30 are illustrated. Wherein, corresponding to... Figure 3AIn this embodiment of the invention, the excitation signal amplitude adjustment unit 34 includes at least two branch adjustment circuits 341, each branch adjustment circuit 341 including a first MOS transistor 3411 and a second MOS transistor 3412. The source of the first MOS transistor 3411 in the same branch adjustment circuit 341 is electrically connected to the drain of the second MOS transistor 3412. The gate of the second MOS transistor 3412 in each branch adjustment circuit 341 is electrically connected to the voltage-controlled oscillator unit 33. The source of the second MOS transistor 3412 in each branch adjustment circuit 341 is grounded. The drain of the first MOS transistor 3411 in each branch adjustment circuit 341 is electrically connected to... The antenna unit 100 is connected to the positive terminal of the power supply via a resistor / inductor 344. The gates of the first MOS transistors 3411 of each branch adjustment circuit 341 are electrically connected to the digital logic processing unit 32. Thus, in the aforementioned structural configuration of the Doppler microwave detection device, based on the circuit structure of the excitation signal amplitude adjustment unit 34, while maintaining the independence of the operating frequency and impedance of the feed circuit 30, the corresponding input information of the adjustment input unit 10 is used to control the on and off of the first MOS transistors 3411 of the corresponding branch adjustment circuits 341, thereby achieving hierarchical selection of the effective amplitude of the excitation signal output by the feed circuit 30 in the form of a high-frequency integrated circuit.

[0083] Corresponding to Figure 3BIn this embodiment of the invention, the excitation signal amplitude adjustment unit 34 includes at least two branch adjustment circuits 341, each branch adjustment circuit 341 including a branch inductor / resistor 3411 and a branch MOS transistor 3412. One end of the branch inductor / resistor 3411 of the same branch adjustment circuit 341 is electrically connected to the drain of the branch MOS transistor 3412, and the other end of the branch inductor / resistor 3411 of each branch adjustment circuit 341 is electrically connected to the voltage-controlled oscillator unit 33 and the antenna unit 100, and connected to the positive power supply via a resistor / inductor 344. The branch MOS transistor of each branch adjustment circuit 341... The source of transistor 3412 is grounded, and the gates of the branch MOS transistors 3412 of each branch adjustment circuit 341 are electrically connected to the digital logic processing unit 32. Thus, in the aforementioned structural configuration of the Doppler microwave detection device, based on the circuit structure of the excitation signal amplitude adjustment unit 34, while maintaining the independence of the operating frequency and impedance of the feed circuit 30, the corresponding input information of the adjustment input unit 10 is used to control the conduction and cutoff of the branch MOS transistors 3412 of the corresponding branch adjustment circuit 341, thereby achieving graded selection of the effective amplitude of the excitation signal output by the feed circuit 30 in the form of a high-frequency integrated circuit.

[0084] Corresponding to Figure 3CIn this embodiment of the invention, the excitation signal amplitude adjustment unit 34 includes at least two branch adjustment circuits 341, each branch adjustment circuit 341 including a branch resistor / inductor 3411, a first MOSFET 3412, and a second MOSFET 3413. The source of the first MOSFET 3412 in the same branch adjustment circuit 341 is electrically connected to the drain of the second MOSFET 3413. The drain of the first MOSFET 3412 in the same branch adjustment circuit 341 is connected to the positive terminal of the power supply via the branch resistor / inductor 3411. The gate of the second MOSFET 3413 in each branch adjustment circuit 341 is electrically connected to the voltage-controlled oscillator unit 33. The source of MOS transistor 3413 is electrically connected to the antenna unit 100 and grounded through a resistor / inductor 344. The gates of the first MOS transistors 3412 of each branch adjustment circuit 341 are electrically connected to the digital logic processing unit 32. Thus, in the aforementioned structural configuration of the Doppler microwave detection device, based on the circuit structure of the excitation signal amplitude adjustment unit 34, while maintaining the independence of the operating frequency and impedance of the feed circuit 30, the corresponding input information of the adjustment input unit 10 is used to control the on and off states of the first MOS transistors 3412 of the corresponding branch adjustment circuit 341, thereby achieving graded selection of the effective amplitude of the excitation signal output by the feed circuit 30 in the form of a high-frequency integrated circuit.

[0085] Corresponding to Figure 3D , Figure 3AA modified circuit structure of the excitation signal amplitude adjustment unit 34 is illustrated, wherein the excitation signal amplitude adjustment unit 34 includes at least two branch adjustment circuits 341, each branch adjustment circuit 341 including a first MOSFET 3411 and a second MOSFET 3412, wherein the source of the first MOSFET 3411 in the same branch adjustment circuit 341 is electrically connected to the drain of the second MOSFET 3412, wherein the gate of the second MOSFET 3412 in each branch adjustment circuit 341 is electrically connected to the voltage-controlled oscillator unit 33, and the source of the second MOSFET 3412 in each branch adjustment circuit 341 is grounded, wherein the first MOSFET 3411 in each branch adjustment circuit 341... The drains of 1 are electrically connected to the antenna unit 100 and connected to the positive power supply via a resistor / inductor 344. The gates of the first MOS transistors 3411 of each branch adjustment circuit 341 are electrically connected to the digital logic processing unit 32. Thus, in the aforementioned structural configuration of the Doppler microwave detection device, based on the circuit structure of the excitation signal amplitude adjustment unit 34, while maintaining the independence of the operating frequency and impedance of the feed circuit 30, the corresponding input information of the adjustment input unit 10 is used to control the conduction and cutoff of the first MOS transistors 3411 of the corresponding branch adjustment circuit 341, thereby achieving hierarchical selection of the effective amplitude of the excitation signal output by the feed circuit 30 in the form of a high-frequency integrated circuit.

[0086] Corresponding to Figure 3E , Figure 3AAnother variation of the circuit structure of the excitation signal amplitude adjustment unit 34 is illustrated. The excitation signal amplitude adjustment unit 34 includes at least two branch adjustment circuits 341, each branch adjustment circuit 341 including a first MOS transistor 3411 and a second MOS transistor 3412. The source of the first MOS transistor 3411 in the same branch adjustment circuit 341 is electrically connected to the drain of the second MOS transistor 3412. The gate of the second MOS transistor 3412 in each branch adjustment circuit 341 is electrically connected to the voltage-controlled oscillator unit 33. The source of the second MOS transistor 3412 in each branch adjustment circuit 341 is grounded. The drain of the first MOS transistor 3411 in each branch adjustment circuit 341 is connected to the positive terminal of the power supply via a first inductor 344. Each first inductor 344 is coupled to a second inductor 345. The second inductor 345 is connected in parallel to one of two mutually coupled third inductors 346. The third inductor 346, which is connected in parallel with the second inductor 345 in the three inductors 346, is grounded. One end of the other third inductor 346 is electrically connected to the antenna unit 100, and the other end is grounded, so as to form an electrical connection between the drain of the first MOS transistor 3411 of each branch adjustment circuit 341 and the antenna unit 100. The gate of the first MOS transistor 3411 of each branch adjustment circuit 341 is electrically connected to the digital logic processing unit 32. In this way, based on the above-mentioned circuit structure of the excitation signal amplitude adjustment unit 34 in the aforementioned structural configuration of the Doppler microwave detection device, while maintaining the independence of the operating frequency and impedance of the feed circuit 30, the corresponding input information of the adjustment input unit 10 is used to realize the on and off control of the first MOS transistor 3411 of the corresponding branch adjustment circuit 341, thereby realizing the hierarchical selection of the effective amplitude of the excitation signal output by the feed circuit 30 in the form of a high-frequency integrated circuit.

[0087] Alternatively, in this embodiment of the invention, the two mutually coupled third inductors 346 are implemented as transformers with center taps.

[0088] It is worth mentioning that, based on the correspondence between the gate, drain, and source of a MOSFET and the base, collector, and emitter of a transistor, in Figures 3A to 3E In the circuit structure of the excitation signal amplitude adjustment unit 34 of the power supply circuit 30 shown, any of the MOS transistors can be equivalently replaced by transistors, and the present invention does not limit this.

[0089] To further disclose the present invention, reference is made to the accompanying drawings in the specification of the present invention. Figure 4 and Figure 5As shown, in the vertical detection application scenario of the Doppler microwave detection device, the effective amplitude V of the excitation signal feeding the antenna element 100 is... n Using the energy density distribution of the microwave beam as a variable, and based on the correspondence between the energy density distribution of the microwave beam and the corresponding noise floor value of the Doppler intermediate frequency signal, the energy density distribution of the microwave beam is related to the effective amplitude V of the excitation signal. n The correlation curves between them and the corresponding actual detection space are illustrated.

[0090] Specifically, based on the noise floor of the Doppler intermediate frequency signal and the effective amplitude V of the excitation signal... n Exploring the correlation curve reveals that it has a segment that tends towards linear change, corresponding to the amplitude segment V of the excitation signal. I V II The segment, then in the amplitude segment V I V II The effective amplitude V of the excitation signal of the segment n When adjusting or setting different amplitude ranges, the energy density distribution of the microwave beam affects the amplitude range V. I V II The effective amplitude V of the excitation signal of the segment n The response to changes in the microwave detection device tends to change linearly, ensuring the energy efficiency of the device.

[0091] In other words, the actual detection space formed by the microwave beam emitted by the antenna element 100 based on its energy density distribution is a space bounded by a gradient boundary. This gradient boundary is the space where the energy density distribution of the corresponding microwave beam attenuates to a certain degree and is therefore non-deterministic. Figure 4 The effective amplitude V of the excitation signal n The change will alter the energy density distribution of the microwave beam, but since the beam angle of the antenna element 100 remains constant, that is, the gradient boundary corresponds to... Figure 5 The outer boundary, indicated by the dashed line, remains unchanged; therefore, the effective amplitude V of the excitation signal is constant. n The change in the energy density distribution of the microwave beam caused by the change is mainly reflected in the adjustment of the inner boundary of the gradient boundary of the actual detection space, in the effective amplitude V of the excitation signal. n In states that are too high or too low, the change in the gradient boundary is not obvious, and the energy efficiency of the microwave detection device is relatively low.

[0092] It is understandable that, since the excitation signal is a high-frequency microwave signal, its effective amplitude V n It is difficult to represent concretely the effective amplitude V of the excitation signal. nIn some expressions, such as in the Doppler microwave detection device in the product form, when the effective amplitude V of the corresponding excitation signal of the adjustment input unit 10 is... n When the corresponding gear is indicated, it can optionally correspond to Figure 5 The effective amplitude V of the excitation signal corresponding to different gear levels is expressed in "dB". n The relative changes between them. Simultaneously, due to the effective amplitude V of the excitation signal... n In the actual circuit, the change manifests as a change in the effective current and / or effective voltage output of the corresponding feed circuit 30, which characterizes or determines the effective amplitude V of the excitation signal. n When the effective current and / or effective voltage output by the feed circuit 30 changes, the effective amplitude V of the excitation signal can be optionally characterized or determined by the change in the effective current and / or effective voltage output by the feed circuit 30. n The changes.

[0093] It is worth mentioning that the effective amplitude V of the excitation signal of the Doppler microwave detection device n The adjustable state is based on the effective amplitude V of the excitation signal. n Correlation with the energy density distribution of the microwave beam emitted by the Doppler microwave detection device allows the actual detection space bounded by the gradient boundary to be adjusted. This effectively adjusts the sensitivity of the Doppler microwave detection device to regulate its detection range. Utilizing the characteristic that the attenuation, reflectivity, and transmittance of the microwave beam tend to remain constant within the same dielectric layer, the adjustment of the amplitude of the excitation signal within the actual detection space is adapted to the target detection space defined by a wall, glass, or metal plate. That is, the inner boundary of the gradient boundary is adapted to the target detection space. The field strength of the microwave beam outside the target detection space can be reduced, which is beneficial for adjusting the effective amplitude V of the excitation signal. n The adjustment eliminates environmental and operational interference outside the target detection space, reduces electromagnetic interference from the Doppler microwave detection device outside the target detection space, and reduces radiation loss outside the target detection space, thereby reducing the radiation power consumption of the microwave detection device. Simultaneously, the intensity of the echo signal formed by the reflection of the microwave beam by the walls, glass, or metal plates defining the target detection space can also be reduced. This reduces the probability of self-excited interference generated by the Doppler microwave detection device based on multipath reflection, especially in situations where highly reflective objects exist or the target detection space is a small, non-open space.

[0094] Furthermore, compared to independently adjusting the sensitivity, adjusting the amplitude of the excitation signal has a relatively clear detection boundary because it can adjust the actual detection space, which is beneficial to ensuring the stability and accuracy of the Doppler microwave detection device in actual detection applications.

[0095] Further reference is made to the accompanying drawings of this invention. Figure 6 As shown, a logic block diagram of an adaptive adjustment method for the detection boundary of a Doppler microwave detection device according to an embodiment of the present invention is illustrated. The adjustment control circuit 20 is configured with an adaptive hierarchy, and the signal processing unit 60 is preset with a preset noise floor value A0. When the adjustment control circuit 20 is adjusted to the adaptive hierarchy state based on the corresponding input information of the adjustment input unit 10, the adjustment control circuit 20 controls the amplitude of the excitation signal generated by the feed circuit 30 to be at V... II The initial value is based on the relatively high correlation between the energy density distribution of the microwave beam and the detection direction of the Doppler microwave detection device and the amplitude of the excitation signal. In the absence of personnel in the target detection space, the adjustment control circuit 20 adjusts the excitation signal to the preset amplitude range V of the excitation signal. I V II The effective amplitude V of the excitation signal generated by the feed circuit 30 is adaptively adjusted from large to small. n The signal processing unit 60 reads the effective amplitude V of the corresponding excitation signal. n The noise floor value A of the Doppler intermediate frequency signal in the frequency spectrum, energy spectrum, power spectrum, or amplitude is described below. k The noise floor value A of the read Doppler intermediate frequency signal. k When the noise level is less than or equal to the preset noise floor value A0, the adjustment control circuit 20 is fed back to adjust the amplitude V of the excitation signal accordingly. H To accommodate the maximum amplitude of the excitation signal in the current environment, it is advantageous to subsequently set the effective amplitude V of the excitation signal based on the boundary of the target detection space. n During adjustment, the controllable range of the target detection space boundary should be ensured, radiation loss outside the target detection space should be reduced, and self-excitation interference and malfunction interference caused by environmental factors should be avoided. For example, if the target detection space is a small space (narrow space) or a space with a high reflectivity, the effective amplitude V of the excitation signal should be avoided. n Correspondingly, the actual detection space is much larger than the target detection space, resulting in self-excited interference, and there is also interference from movements such as curtains swaying outside the target detection space, avoiding interference with the effective amplitude V of the excitation signal. n The corresponding actual detection space extends beyond the target detection space, causing erroneous interference.

[0096] It is worth mentioning that, based on the aforementioned noise floor value A k The fluctuations in actual detection affect the noise floor A of the Doppler intermediate frequency signal. k The determination that the noise floor value is less than or equal to the preset noise floor value A0 allows for the determination of the noise floor value A based on the Doppler intermediate frequency signal. k The range of the difference between the noise floor value A0 and the preset noise floor value A0 is determined, such as the noise floor value A0 of the Doppler intermediate frequency signal. k When the difference between the noise floor value A0 and the preset noise floor value A0 is less than a preset difference, the noise floor value A of the Doppler intermediate frequency signal is determined to be less than or equal to the preset noise floor value A0. k The noise level is less than or equal to the preset noise floor value A0, but the present invention does not impose any restrictions on this.

[0097] Furthermore, the adjustment and control circuit 20 continues to operate within the preset amplitude range V of the excitation signal. I V II With V H The effective amplitude V of the excitation signal is adjusted from large to small to set the maximum amplitude limit. n The signal processing unit 60 reads the effective amplitude V of the corresponding excitation signal. n The noise floor value A of the Doppler intermediate frequency signal below k And the noise floor value A of the Doppler intermediate frequency signal read. k The ambient noise floor value is used to establish the relationship between the current ambient noise floor value and the effective amplitude V of the corresponding excitation signal. n The corresponding information is used to adaptively set the target detection space based on the location of the moving object (such as a waving or walking human body) as the boundary of the target detection space in the subsequent state where a moving object exists in the target detection space. The adjustment control circuit 20 is in the amplitude range V of the excitation signal. I V II Section V H The effective amplitude V of the excitation signal is adjusted from small to large to set the maximum amplitude limit. n The signal processing unit 60 reads the effective amplitude V of the corresponding excitation signal. n The amplitude A of the Doppler intermediate frequency signal in the frequency spectrum, energy spectrum, power spectrum, or amplitude is compared with the effective amplitude V of the corresponding excitation signal. n When there is a difference in the corresponding environmental noise floor value, the amplitude V of the corresponding excitation signal is used. L To match the minimum amplitude of the target detection space, so that it is possible to base the excitation signal on the amplitude range V L V H The effective amplitude V of the segment nThe setting allows for adaptive setting of the target detection space with the location of the moving object as the boundary, which is simple and easy to implement, and helps to reduce the installation cost of the Doppler microwave detection device.

[0098] Correspondingly, the adaptive adjustment method for the detection boundary of the Doppler microwave detection device includes the following steps:

[0099] S1. In a state where the target detection space is unoccupied, within a preset amplitude range V of the excitation signal. I V II The effective amplitude V of the excitation signal is adaptively adjusted from large to small. n ;

[0100] S2. Read the effective amplitude V of the corresponding excitation signal. n The noise floor value A of the Doppler intermediate frequency signal in the frequency spectrum, energy spectrum, power spectrum, or amplitude is described below. k And compare the noise floor value A of the read Doppler intermediate frequency signal. k Compared with the preset noise floor value A0, the noise floor value A of the read Doppler intermediate frequency signal is... k When the noise floor value is less than or equal to the preset noise floor value A0, the amplitude V of the corresponding excitation signal is used. H The maximum amplitude of the excitation signal is determined to be suitable for the current environment, and the noise floor value A of the read Doppler intermediate frequency signal is also considered. k Let A be the ambient noise floor value, and establish the ambient noise floor value A under the current environment. k The amplitude range V of the excitation signal I V H Effective amplitude V n The corresponding information;

[0101] S3. In the state where there is a moving object in the target detection space, in the amplitude segment V I V H Adjust the effective amplitude V of the excitation signal from small to large n ;

[0102] S4. Read the effective amplitude V of the corresponding excitation signal. n The amplitude A of the Doppler intermediate frequency signal in the frequency spectrum, energy spectrum, power spectrum, or amplitude is measured, and the amplitude A of the Doppler intermediate frequency signal is compared with the effective amplitude V of the corresponding excitation signal. n The corresponding ambient noise level A k The amplitude A of the Doppler intermediate frequency signal read is greater than the effective amplitude V of the corresponding excitation signal. n The corresponding ambient noise level A k At that time, the amplitude V of the corresponding excitation signal is... LTo match the minimum amplitude in the target detection space, the amplitude range V is determined. L V H The effective amplitude V of the excitation signal is adapted to the current environment. n The adjustment range; and

[0103] S5, in the amplitude range V of the excitation signal L V H Set the effective amplitude V of the excitation signal n .

[0104] Preferably, in step S4, the amplitude A of the Doppler intermediate frequency signal read is used as the amplitude threshold to establish the amplitude segment V of the excitation signal. L V H The effective amplitude V of the segment n The corresponding information between the amplitude threshold and the corresponding amplitude threshold, and in step S5, to correspond to the effective amplitude V n The amplitude threshold is the threshold of the Doppler intermediate frequency signal at amplitude A. The effective features of the Doppler intermediate frequency signal are extracted, and the corresponding control signal is output to the corresponding electrical equipment based on the extracted effective features of the Doppler intermediate frequency signal.

[0105] It is understood that the description of the uninhabited state of the target detection space in step S1 and the description of the presence of a moving object in the target detection space in step S3 are reasonable descriptions of the execution timing of steps S1 and S2. That is, step S1 is suitable for execution when the target detection space is uninhabited, and step S3 is suitable for execution when a moving object is present in the target detection space. They are only used to explain the rationality of the adaptive adjustment method of the detection boundary of the Doppler microwave detection device and do not constitute a limitation on whether there are human bodies / moving objects in the operating environment of the Doppler microwave detection device, nor do they constitute a limitation on the Doppler microwave detection device's adaptive adjustment method of the detection boundary including a step of judging whether there are human bodies / moving objects in the target detection space. In fact, the state of no one in the target detection space in step S1 and the state of having an active object in the target detection space in step S3 correspond to the Doppler microwave detection device receiving the corresponding instructions. For example, the Doppler microwave detection device executes step S1 based on receiving a first instruction sent by the user and executes step S3 based on receiving a second instruction sent by the user. The description of the state of no one in the target detection space in step S1 and the description of the state of having an active object in the target detection space in step S3 are reasonable descriptions of the timing of the user sending the first instruction and the second instruction.

[0106] It is worth mentioning that, compared to independently using sensitivity adjustment, adjusting the effective amplitude V of the excitation signal...n In this way, the actual detection space bounded by the gradient boundary can be adjusted based on the changes in the gradient boundary. Therefore, the adaptation relationship between the input information of the adjustment input unit 10 corresponding to different levels of the adjustment control circuit 20 and the target detection space under the corresponding scene or size can be intuitively illustrated based on the adaptability between the size of the actual detection space and the corresponding target detection space. This allows users to easily select the appropriate level of the adjustment control circuit 20 for different scenes or sizes of target detection space based on the adaptation relationship between the input information of the adjustment input unit 10 and the target detection space under the corresponding scene or size. This facilitates the widespread adoption of the Doppler microwave detection device even in microwave-invisible environments.

[0107] Example, referring to the accompanying drawings of the specification of the present invention. Figure 7 As shown in the figure, the excitation signal is adjusted to the amplitude range V. L V H When the effective amplitude of the segment is reached, the adaptation relationship between the size of the actual detection space and the target detection space of different sizes is shown in the figure. It can be seen that when the excitation signal is adjusted to the current effective amplitude, the adaptation between the actual detection space and the target detection space with a detection height of H1 and a detection area of ​​S1 is better. Therefore, compared to independently using sensitivity adjustment, adjusting the effective amplitude V of the excitation signal... n In this way, since the actual detection space bounded by the gradient boundary can be adjusted based on changes in the gradient boundary, the effective amplitude V of different excitation signals is... n The compatibility between the actual detection space size and the target detection space of the corresponding scene or size, and the compatibility relationship between the input information of the adjustment input unit 10 and the target detection space of the corresponding scene or size, can be intuitively reflected. For example, the input information of the adjustment input unit 10 and the corresponding scene (such as a high-reflection scene) or size (such as the size characterized by parameters such as height, area, and diameter) of the target detection space can be listed in a table form on the body or instruction manual of the Doppler microwave detection device. This is beneficial for users to easily select the appropriate level of the adjustment control circuit 20 according to the compatibility relationship between the input information of the adjustment input unit 10 and the target detection space of the corresponding scene or size for different scenes or sizes of target detection spaces. Therefore, it is beneficial to popularize the Doppler microwave detection device in the state where microwaves are not visible.

[0108] Example, referring to the accompanying drawings of the specification of the present invention. Figures 8A to 8C As shown, the application scenarios of the Doppler microwave detection device of the present invention in the target detection space under different scenes or sizes are illustrated. Corresponding to Figure 8A and Figure 8B The intended target detection space is a microwave detection scenario in a small (narrow) space or a space with a high reflectivity. Since independently adjusting the sensitivity does not change the actual detection space of the Doppler microwave detection device, and the actual detection space is much larger than the target detection space, sensitivity adjustment cannot solve the interference problems outside the target detection space and the self-excitation interference problems caused by multipath reflections. However, by reducing the effective amplitude V of the excitation signal... n In this way, the actual detection space can be adjusted to match the target detection space, thereby reducing the field strength of the microwave beam outside the target detection space. This helps to eliminate environmental and motion interference outside the target detection space, reduce electromagnetic interference from the Doppler microwave detection device outside the target detection space, and reduce radiation loss outside the target detection space, thus reducing the radiation power consumption of the microwave detection device. Simultaneously, the intensity of the echo signal formed by the reflection of the microwave beam from walls, glass, or metal plates defining the target detection space can also be reduced. This reduces the probability of self-excited interference from the Doppler microwave detection device based on multipath reflection in the presence of highly reflective objects or in the case of a small, non-open space within the target detection space. Consequently, it increases the proportion of echo signals reflected from moving objects, thus helping to ensure the stability and accuracy of the Doppler microwave detection device in practical detection applications.

[0109] Corresponding to Figure 8C The illustrated detection space represents a microwave detection scenario with interfering actions. Taking the movement of curtains as an example, the Doppler intermediate frequency (IF) signal corresponding to the curtain movement is similar in frequency to the signal corresponding to human movement. However, because the reflective area of ​​the curtain is larger than that of the human body, the amplitude of the Doppler IF signal corresponding to the curtain movement is greater than that corresponding to human movement at the same distance. Therefore, the interference from the curtain movement cannot be eliminated by independently reducing sensitivity. Instead, the interference is eliminated by reducing the effective amplitude V of the excitation signal. n In this way, the actual detection space can be adjusted to an area that does not include the fluttering of the curtains, thereby eliminating interference from the fluttering of the curtains.

[0110] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and any variations or modifications may be made to the implementation of the present invention without departing from the stated principles.

Claims

1. An adaptive adjustment method for the detection boundary of a Doppler microwave detection device, characterized in that, Includes the following steps: S1. In a state where the target detection space is unmanned, a preset amplitude segment V of an excitation signal is used. I V II The effective amplitude V of the excitation signal is adaptively adjusted from large to small. n ; S2. Read the effective amplitude V of the corresponding excitation signal. n The noise floor A of the Doppler intermediate frequency signal in terms of frequency spectrum, energy spectrum, power spectrum, or amplitude. k And compare the noise floor value A of the read Doppler intermediate frequency signal. k With a preset noise floor value A0, the noise floor value A of the read Doppler intermediate frequency signal is... k When the noise floor value is less than or equal to the preset noise floor value A0, the amplitude V of the corresponding excitation signal is used. H The maximum amplitude of the excitation signal is determined to be suitable for the current environment, and the noise floor value A of the read Doppler intermediate frequency signal is also considered. k Let A be the ambient noise floor value, and establish the ambient noise floor value A under the current environment. k The amplitude segment V of the excitation signal I V H Effective amplitude V n The corresponding information; S3, In the state where there is a moving object in the target detection space, in the amplitude segment V I V H Adjust the effective amplitude V of the excitation signal from small to large n ; S4. Read the effective amplitude V of the corresponding excitation signal. n The amplitude A of the Doppler intermediate frequency signal in the frequency spectrum, energy spectrum, power spectrum, or amplitude is measured, and the amplitude A of the Doppler intermediate frequency signal is compared with the effective amplitude V of the corresponding excitation signal. n The corresponding ambient noise level A k The amplitude A of the Doppler intermediate frequency signal read is greater than the effective amplitude V of the corresponding excitation signal. n The corresponding ambient noise level A k At that time, the amplitude V of the corresponding excitation signal is... L To match the minimum amplitude in the target detection space, the amplitude range V is determined. L V H The effective amplitude V of the excitation signal is adapted to the current environment. n The adjustment range; and S5, at the amplitude segment V of the excitation signal L V H setting the effective amplitude V of the excitation signal n .

2. The adaptive adjustment method for the detection boundary of the Doppler microwave detection device according to claim 1, wherein the Doppler microwave detection device includes a feed circuit, a mixer unit, and an antenna unit, wherein the feed circuit is configured in an integrated circuit form and includes a digital logic processing unit, a voltage-controlled oscillator unit, and an excitation signal amplitude adjustment unit, wherein the voltage-controlled oscillator unit is simultaneously electrically connected to the digital logic processing unit and the excitation signal amplitude adjustment unit, so as to output the excitation signal of a corresponding frequency to the excitation signal amplitude adjustment unit under the control of the digital logic processing unit, wherein the excitation signal amplitude adjustment unit is electrically connected to the antenna unit and electrically connected to the digital logic processing unit under the control of the digital logic processing unit, so as to be controlled by the digital logic processing unit. The effective amplitude of the excitation signal received from the voltage-controlled oscillator unit is adjusted and fed to the antenna unit. The antenna unit is electrically connected to the mixer unit to transmit a microwave beam corresponding to the frequency of the excitation signal while fed by the excitation signal output from the excitation signal amplitude adjustment unit, thereby forming an actual detection space. The mixer unit receives a reflected echo formed by the microwave beam reflected by a corresponding object in the actual detection space and transmits an echo signal corresponding to the reflected echo to the mixer unit. The mixer unit is further electrically connected to the voltage-controlled oscillator unit to receive the excitation signal output from the voltage-controlled oscillator unit and outputs a Doppler intermediate frequency signal corresponding to the frequency / phase difference between the excitation signal and the echo signal in a mixing and detection manner.

3. The adaptive adjustment method for the detection boundary of the Doppler microwave detection device according to claim 2, wherein the Doppler microwave detection device further includes an adjustment input unit and an adjustment control circuit, wherein the adjustment control circuit includes an input identification unit, a logic processing unit, and a communication interface unit, wherein the input identification unit is electrically connected to the adjustment input unit and the logic processing unit to identify the input information of the adjustment input unit and transmit digital information corresponding to the input information to the logic processing unit, wherein the logic processing unit is preset with corresponding hierarchical control commands that can be recognized by the digital logic processing unit and is electrically connected to the... The communication interface unit retrieves corresponding hierarchical control commands based on digital information received from the input recognition unit and transmits them to the communication interface unit. The power supply circuit further includes a communication interface module, which is electrically connected to the communication interface unit to receive the corresponding hierarchical control commands from the communication interface unit. The digital logic processing unit is electrically connected to the communication interface module to receive the corresponding hierarchical control commands from the communication interface module and, based on the received hierarchical control commands, controls the excitation signal amplitude adjustment unit to adjust the effective amplitude of the excitation signal input from the voltage-controlled oscillation unit.

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