Doppler microwave sounding method with determined sounding boundary

Abstract

The present application provides a Doppler microwave detection method with determined detection boundary, which is based on segmented linear frequency modulation of excitation signal, emits microwave beams in linear frequency modulation mode, and receives echo signals corresponding to reflected echoes of the microwave beams reflected by at least one object, and generates a Doppler intermediate frequency signal corresponding to frequency and phase difference between the excitation signal and the echo signal through mixed frequency detection, so that different frequency components of the Doppler intermediate frequency signal in the frequency domain correspond to different distances between the object in the coverage space of the microwave beam and the corresponding microwave detection module, and when there is movement of the object in the space, the frequency and initial phase of the Doppler intermediate frequency signal have fluctuations in the time domain, so that the object activity in the effective detection space with determined detection boundary can be detected based on multiple limit settings of the Doppler intermediate frequency signal in frequency and initial phase.

Description

Technical Field

[0001] This invention relates to the field of Doppler microwave detection, and more particularly to a Doppler microwave detection method with defined detection boundaries. 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. Radio technology, including existing microwave detection technology based on the Doppler effect, serves as a crucial hub for connecting people and objects, and between objects themselves. It possesses unique advantages in behavior and presence detection technologies. Without infringing on human privacy, it can transmit a microwave beam at a fixed frequency 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 movement of the corresponding object. Thus, the effective amplitude of the IF signal, satisfying a certain threshold, characterizes the movement of the corresponding object. When applied to the detection of human activity, it can achieve intelligent interconnection between people and objects, showing broad application prospects. However, on the one hand, the boundary of the corresponding microwave beam is an indeterminate gradient boundary where the radiated energy attenuates to a certain degree; on the other hand, there is a lack of effective control over electromagnetic radiation. The lack of methods for shaping the gradient boundary of the corresponding microwave beam mainly manifests in the shortage of methods for adjusting the beam angle of the microwave beam. The actual detection space of the corresponding microwave detection module is fixed and difficult to control, resulting in a mismatch between the actual detection space and the corresponding target detection space. This leads to a situation where 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 environment. This results in the poor accuracy and / or poor anti-interference performance of the existing microwave detection technology based on the Doppler effect principle. That is, since the boundary of the microwave beam is a gradient boundary where the radiation 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, the current approach primarily involves defining an effective detection space within the actual detection space of the microwave detection module by adjusting its sensitivity. Specifically, this is achieved by setting a corresponding threshold for the amplitude of the Doppler intermediate frequency signal to adjust the sensitivity of the microwave detection module. In scenarios where the actual detection space of the microwave detection module is larger than the corresponding target detection space, the defined effective detection space allows it to match the target detection space, thereby eliminating environmental interference from 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 formed by the moving object, and simultaneously to the size of the reflecting surface and the speed of the moving object, as well as the distance between the moving object and the microwave detection module, the definition of the effective detection space based on the sensitivity adjustment of the microwave detection module is not stable or accurate. 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 their different reflecting surface sizes and / or speeds. Similarly, moving objects farther from the microwave detection module may have higher amplitude feedbacks in the Doppler intermediate frequency signal due to their larger reflecting surface and / or speed. In other words, the sensitivity adjustment of the microwave detection module cannot form an effective detection space with a defined boundary, resulting in the detection boundary of the microwave detection module being inaccurate and unstable in practical applications.

[0004] In other words, due to the fact that the boundary of the microwave beam is a gradient boundary where the radiation energy attenuates to a certain extent, the lack of means to shape the gradient boundary of the microwave beam, and the inability to form an effective detection space with a defined boundary by adjusting the sensitivity of the microwave detection module based on the corresponding threshold setting of the amplitude of the Doppler intermediate frequency signal, the current microwave detection technology based on the Doppler effect principle has limited adaptability to different application scenarios and has poor detection stability and accuracy in practical applications. Summary of the Invention

[0005] One objective of this invention is to provide a Doppler microwave detection method with defined detection boundaries, wherein the Doppler microwave detection method with defined detection boundaries can form an effective detection space with defined boundaries in the actual detection space, and the activity detection of the effective detection space based on the Doppler microwave detection method with defined detection boundaries can obtain accurate and stable detection results.

[0006] One object of the present invention is to provide a Doppler microwave detection method with a defined detection boundary, wherein the boundary of the effective detection space can be controllably adjusted based on corresponding circuit or program settings, that is, the boundary of the effective detection space can be adjusted to match the corresponding target detection space and thus have adaptability to different application scenarios.

[0007] One object of the present invention is to provide a Doppler microwave detection method with a defined detection boundary, wherein the boundary of the effective detection space can be controllably adjusted based on corresponding circuit or program settings, thereby allowing accurate and stable detection results to be obtained for the activity detection of the target detection space based on the Doppler microwave detection method with a defined detection boundary by adjusting the boundary of the effective detection space to match the corresponding target detection space.

[0008] One object of the present invention is to provide a Doppler microwave detection method with a defined detection boundary, wherein a microwave beam of piecewise linear frequency modulation is transmitted based on piecewise linear frequency modulation of an excitation signal, and at least one reflected echo is generated by receiving the microwave beam reflected by at least one object to form an echo signal corresponding to the reflected echo. A Doppler intermediate frequency (IF) signal corresponding to the frequency and phase difference between the excitation signal and the echo signal is generated in a time-domain signal form through frequency mixing and detection. Specifically, the frequency of the Doppler IF signal is a discrete state of the frequency difference between the excitation signal and each of the echo signals, having at least one frequency component. The initial phase of the Doppler IF signal... The discrete state of the phase difference between the excitation signal and the corresponding echo signal at the time point corresponding to the starting point of the Doppler intermediate frequency signal of each frequency component, wherein the coverage space of the microwave beam is the actual detection space, then the different frequency components of the Doppler intermediate frequency signal in the time domain correspond to different distances between the object and the corresponding microwave detection module in the actual detection space. In this way, based on the corresponding limit value of the Doppler intermediate frequency signal in the frequency domain, an upper limit frequency limit is set to define the outer boundary of the effective detection space, and the effective detection space defined by the detection distance is formed, so that the effective detection space has a definite boundary.

[0009] One object of the present invention is to provide a Doppler microwave detection method with defined detection boundaries, wherein when there is motion of an object in the actual detection space, the frequency and initial phase of the Doppler intermediate frequency signal have time-domain fluctuations. This allows for the determination of object activity within the effective detection space based on further limit settings for the frequency and / or initial phase of the Doppler intermediate frequency signal, using a lower limit frequency difference limit and / or a lower limit phase difference limit. When the Doppler intermediate frequency signal corresponding to frequency components less than or equal to the upper limit frequency limit has frequency fluctuations greater than or equal to the lower limit frequency difference limit, or has initial phase fluctuations greater than or equal to the lower limit phase difference limit, it is determined that there is object activity within the effective detection space.

[0010] One object of the present invention is to provide a Doppler microwave detection method with a defined detection boundary, wherein a range Doppler intermediate frequency signal is generated by filtering the Doppler intermediate frequency signal containing frequency components less than or equal to the upper frequency limit. That is, the range Doppler intermediate frequency signal is the signal component in the Doppler intermediate frequency signal whose frequency is less than or equal to the upper frequency limit and only represents the effective detection space, thereby defining the effective detection space based on the setting of the upper frequency limit by setting the corresponding filtering parameters.

[0011] One object of the present invention is to provide a Doppler microwave detection method with a defined detection boundary, wherein the range-Doppler intermediate frequency signal is converted into a frequency fluctuation signal according to the frequency change of the range-Doppler intermediate frequency signal over time, and the amplitude fluctuation of the frequency fluctuation signal corresponds to the frequency fluctuation of the range-Doppler intermediate frequency signal. Thus, when there is an amplitude fluctuation in the frequency fluctuation signal that is greater than or equal to the lower limit frequency difference limit, it is determined that there is object activity in the effective detection space.

[0012] One objective of this invention is to provide a Doppler microwave detection method with a defined detection boundary. The method converts the distance-Doppler intermediate frequency (IF) signal into a frequency fluctuation signal based on the frequency-time variation of the IF signal. The amplitude-time variation of the frequency fluctuation signal corresponds to the frequency-time variation of the IF signal, thus characterizing the distance-time variation between the object in the effective detection space and the corresponding microwave detection module. In other words, the frequency of the frequency fluctuation signal corresponds to the motion frequency of the corresponding object. Based on filtering the frequency fluctuation signal, the amplitude fluctuation frequency is selected within a frequency range less than or equal to 10 Hz. Thus, when an amplitude fluctuation greater than or equal to the lower limit frequency difference exists in the frequency fluctuation signal after frequency selection and filtering, this amplitude fluctuation corresponds to an action with an action frequency within the 10 Hz frequency range, and can highly likely characterize the breathing and heartbeat of a human body within the effective detection space. Therefore, this method is suitable for accurately and stably detecting the presence of a human body and for intelligently controlling corresponding electrical equipment based on the detection of the human body's presence.

[0013] One objective of this invention is to provide a Doppler microwave detection method with a defined detection boundary, wherein a Fourier transform is performed on the range-Doppler intermediate frequency signal to obtain the distribution information of the frequency values ​​of the range-Doppler intermediate frequency signal of each frequency component in the time dimension. The distribution information of the frequency values ​​of the range-Doppler intermediate frequency signal of each frequency component in the time dimension corresponds to the fluctuation information of the distance between the corresponding object and the microwave detection module in the time dimension within the effective detection space, defined based on the distance resolution. Thus, when the distribution information of the frequency values ​​of the range-Doppler intermediate frequency signal of at least one frequency component in the time dimension has a frequency fluctuation greater than or equal to the lower limit frequency difference limit, it is determined that there is object activity within the effective detection space.

[0014] One object of the present invention is to provide a Doppler microwave detection method with a defined detection boundary, wherein a Fourier transform is performed on the range-Doppler intermediate frequency signal to obtain the distribution information of the frequency values ​​of the range-Doppler intermediate frequency signal of each frequency component in the time dimension. The distribution information of the frequency values ​​of the range-Doppler intermediate frequency signal of each frequency component in the time dimension corresponds to the fluctuation information of the distance between the corresponding object and the microwave detection module within the effective detection space, defined by distance resolution. That is, the fluctuation frequency of the frequency value fluctuation of the range-Doppler intermediate frequency signal of each frequency component in the time dimension corresponds to the motion frequency of the corresponding object within the effective detection space, defined by distance resolution. Thus, in at least one frequency component... The frequency distribution information of the distance Doppler intermediate frequency signal in the time dimension has a frequency value fluctuation greater than or equal to the lower limit frequency difference limit. Moreover, when the frequency fluctuation frequency of the distance Doppler intermediate frequency signal of this frequency component in the time dimension is less than or equal to a frequency range of 10 Hz, and the corresponding action frequency is within the frequency range of 10 Hz, the frequency value fluctuation of the distance Doppler intermediate frequency signal of this frequency component in the time dimension is highly likely to characterize the breathing and heartbeat of the human body in the effective detection space. Furthermore, the distance between the human body and the corresponding microwave detection module can be determined according to this frequency component. Therefore, it is suitable for accurately and stably detecting the presence of the human body and intelligently controlling the corresponding electrical equipment based on the detection of the presence of the human body.

[0015] One objective of this invention is to provide a Doppler microwave detection method with a defined detection boundary, wherein a Fourier transform is performed on the range-Doppler intermediate frequency signal to obtain the distribution information of the initial phase of the range-Doppler intermediate frequency signal of each frequency component in the time dimension. The distribution information of the initial phase of the range-Doppler intermediate frequency signal of each frequency component in the time dimension corresponds to the fluctuation information of the distance between the object and the microwave detection module in the time dimension based on the distance resolution and each frequency component within the effective detection space. Thus, when the distribution information of the initial phase of the range-Doppler intermediate frequency signal of at least one frequency component in the time dimension has a fluctuation greater than or equal to the lower limit phase difference limit, it is determined that there is object activity within the effective detection space.

[0016] One objective of this invention is to provide a Doppler microwave detection method with a defined detection boundary. Based on the periodic characteristics of the phase, when the distribution information of the frequency value of the range-Doppler intermediate frequency signal of a corresponding frequency component in the time dimension has a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, the time dimension fluctuation of the initial phase of the range-Doppler intermediate frequency signal of that frequency component provides ambiguous feedback on the time dimension fluctuation of the distance between the object corresponding to that frequency component and the microwave detection module. The method involves performing a Fourier transform on the range-Doppler intermediate frequency signal to obtain the time dimension frequency value of the range-Doppler intermediate frequency signal of each frequency component. The distribution information of the range-Doppler intermediate frequency signal of each frequency component is obtained, and the distribution information of the initial phase of the range-Doppler intermediate frequency signal of each frequency component in the time dimension is obtained. When the distribution information of the frequency value of the range-Doppler intermediate frequency signal of at least one frequency component in the time dimension does not have a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, the distribution information of the initial phase of the range-Doppler intermediate frequency signal of that frequency component in the time dimension has a phase fluctuation greater than or equal to the lower limit phase difference limit. It is then determined that there is activity of an object in the effective detection space corresponding to that frequency component based on the distance resolution, thereby improving the detection accuracy of the Doppler microwave detection method with a defined detection boundary.

[0017] One objective of this invention is to provide a Doppler microwave detection method with a defined detection boundary, wherein a Fourier transform is performed on the range-Doppler intermediate frequency (IF) signal to obtain the distribution information of the frequency values ​​of the range-Doppler IF signal of each frequency component in the time dimension, and the distribution information of the initial phase of the range-Doppler IF signal of each frequency component in the time dimension is obtained. When the distribution information of the frequency values ​​of the range-Doppler IF signal of at least one frequency component in the time dimension does not have frequency fluctuations greater than or equal to the lower limit frequency difference limit, the distribution information of the initial phase of the range-Doppler IF signal of that frequency component in the time dimension provides unambiguous feedback on the time-dimensional fluctuations of the distance between the object corresponding to that frequency component and the microwave detection module; that is, the frequency of the initial phase fluctuation of the range-Doppler IF signal of that frequency component in the time dimension corresponds to... Within the effective detection space, based on the motion frequency of the corresponding object defined by distance resolution, if the distribution information of the initial phase of the distance Doppler intermediate frequency signal of that frequency component in the time dimension has a phase fluctuation greater than or equal to the lower limit phase difference limit, and the fluctuation frequency of the initial phase of the distance Doppler intermediate frequency signal of that frequency component in the time dimension is less than or equal to a frequency range of 10 Hz, corresponding to an action frequency within a frequency range of 10 Hz, then the fluctuation of the initial phase of the distance Doppler intermediate frequency signal of that frequency component in the time dimension highly likely characterizes the breathing and heartbeat of the human body within the effective detection space, and the distance between the human body and the corresponding microwave detection module can be determined corresponding to that frequency component. Therefore, it is suitable for accurately and stably detecting the presence of the human body, and for intelligently controlling the corresponding electrical equipment based on the detection of the human body's presence.

[0018] One objective of this invention is to provide a Doppler microwave detection method with a defined detection boundary, wherein a Fourier transform is performed on the Doppler intermediate frequency signal to obtain the distribution information of the frequency values ​​of the Doppler intermediate frequency signal of each frequency component in the time dimension. The distribution information of the frequency values ​​of the Doppler intermediate frequency signal of each frequency component in the time dimension corresponds to the fluctuation information of the distance between the corresponding object and the microwave detection module in the time dimension, defined based on the distance resolution in the actual detection space. Thus, when the distribution information of the frequency values ​​of the Doppler intermediate frequency signal of at least one frequency component less than or equal to the upper limit frequency limit has a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, it is determined that there is object activity in the effective detection space.

[0019] One objective of this invention is to provide a Doppler microwave detection method with a defined detection boundary, wherein a Fourier transform is performed on the Doppler intermediate frequency signal to obtain the distribution information of the frequency values ​​of the Doppler intermediate frequency signal of each frequency component in the time dimension. The distribution information of the frequency values ​​of the Doppler intermediate frequency signal of each frequency component in the time dimension corresponds to the fluctuation information of the distance between the corresponding object and the microwave detection module in the time dimension, defined by distance resolution in the actual detection space. That is, the fluctuation frequency of the frequency values ​​of the Doppler intermediate frequency signal of each frequency component in the time dimension corresponds to the motion frequency of the corresponding object in the actual detection space, defined by distance resolution. This allows for detection within a frequency range less than or equal to the upper frequency limit. The frequency distribution information of at least one frequency component of the Doppler intermediate frequency signal in the time dimension has a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, and the fluctuation frequency of the frequency component in the time dimension is less than or equal to a frequency range of 10 Hz. When the action frequency is within the frequency range of 10 Hz, the frequency value fluctuation of the Doppler intermediate frequency signal of the frequency component in the time dimension is highly likely to characterize the breathing and heartbeat of the human body in the effective detection space, and the distance between the human body and the corresponding microwave detection module can be determined according to the frequency component. Therefore, it is suitable for accurately and stably detecting the presence of the human body and intelligently controlling the corresponding electrical equipment based on the detection of the presence of the human body.

[0020] One objective of this invention is to provide a Doppler microwave detection method with a defined detection boundary, wherein a Fourier transform is performed on the Doppler intermediate frequency signal to obtain the distribution information of the initial phase of the Doppler intermediate frequency signal of each frequency component in the time dimension. The distribution information of the initial phase of the Doppler intermediate frequency signal of each frequency component in the time dimension corresponds to the fluctuation information of the distance between the object and the microwave detection module in the time dimension based on the distance resolution and each frequency component in the actual detection space. Thus, when the distribution information of the initial phase of the Doppler intermediate frequency signal of at least one frequency component less than or equal to the upper limit frequency limit has a fluctuation greater than or equal to the lower limit phase difference limit, it is determined that there is object activity in the effective detection space.

[0021] One objective of this invention is to provide a Doppler microwave detection method with defined detection boundaries. The method involves performing a Fourier transform on the Doppler intermediate frequency (IF) signal to obtain the distribution information of the frequency values ​​of each frequency component of the IF signal in the time dimension, and obtaining the distribution information of the initial phase of each frequency component of the IF signal in the time dimension. When the distribution information of the frequency values ​​of at least one frequency component (less than or equal to the upper frequency limit) in the time dimension does not have frequency fluctuations greater than or equal to the lower frequency difference limit, and the distribution information of the initial phase of the IF signal of that frequency component in the time dimension has phase fluctuations greater than or equal to the lower phase difference limit, it is determined that there is activity of an object corresponding to that frequency component within the effective detection space, based on the distance resolution. This improves the detection accuracy of the Doppler microwave detection method with defined detection boundaries.

[0022] One objective of this invention is to provide a Doppler microwave detection method with a defined detection boundary. When at least one frequency component of the Doppler intermediate frequency signal has a frequency fluctuation greater than or equal to the lower limit frequency difference limit, and / or the initial phase of the Doppler intermediate frequency signal of at least one frequency component has an initial phase fluctuation greater than or equal to the lower limit phase difference limit, based on a setting instruction for the upper limit frequency limit, the lower limit frequency limit is preset or reset using the smallest frequency component among the frequency components. This simplifies and facilitates the setting of the boundary of the effective detection space, avoiding the need for specialized measurement and calculation of the installation height of the corresponding microwave detection module, thus providing better applicability.

[0023] One objective of this invention is to provide a Doppler microwave detection method with a defined detection boundary, wherein at least two Doppler intermediate frequency signals are formed based on the number of corresponding microwave detection modules. This allows the distribution location information of the moving object within the effective detection space to be obtained based on the correspondence between the same moving object and the corresponding frequency components of the two Doppler intermediate frequency signals. This is beneficial for further intelligent control of corresponding electrical equipment based on the detection of the location of the human body.

[0024] According to one aspect of the present invention, the present invention provides a Doppler microwave detection method with defined detection boundaries, the Doppler microwave detection method with defined detection boundaries comprising the following steps:

[0025] (A) A segmented linear frequency modulated excitation signal is used to transmit a microwave beam in a linear frequency modulated form, wherein the coverage space of the microwave beam is the actual detection space;

[0026] (B) Receive at least one reflected echo formed by the microwave beam being reflected by at least one object in the actual detection space and generate an echo signal corresponding to the reflected echo.

[0027] (C) A Doppler intermediate frequency signal corresponding to the frequency and phase difference between the excitation signal and the echo signal is generated in the form of a time-domain signal by means of frequency mixing and detection. That is, the frequency of the Doppler intermediate frequency signal is a discrete state of the frequency difference between the excitation signal and each of the echo signals and has at least one frequency component. The initial phase of the Doppler intermediate frequency signal is a discrete state of the phase difference between the excitation signal and the corresponding echo signal at the time point corresponding to the starting point of the Doppler intermediate frequency signal of each frequency component.

[0028] (D) Based on the frequency limit setting of the Doppler intermediate frequency signal, an upper limit frequency limit is used to define the outer boundary of an effective detection space in the actual detection space;

[0029] (E) Based on the frequency and / or initial phase limit settings of the Doppler intermediate frequency signal, the activity of an object in the effective detection space is determined by the lower limit frequency difference limit and / or the lower limit phase difference limit. If the Doppler intermediate frequency signal based on the frequency component less than or equal to the upper limit frequency limit has a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, or has an initial phase fluctuation greater than or equal to the lower limit phase difference limit, it is determined that there is an object activity in the effective detection space.

[0030] In one embodiment, in step (D), a distance-Doppler intermediate frequency signal is generated by selecting a Doppler intermediate frequency signal whose frequency component is less than or equal to the upper limit frequency limit using a frequency selective filtering method. The distance-Doppler intermediate frequency signal only represents the effective detection space, and the effective detection space is defined by setting the upper limit frequency limit based on the setting of the corresponding filtering parameters.

[0031] In one embodiment, step (E) includes the step of:

[0032] (E10) Based on the frequency change of the distance-Doppler intermediate frequency signal over time, the distance-Doppler intermediate frequency signal is converted into a frequency fluctuation signal. The amplitude fluctuation of the frequency fluctuation signal corresponds to the frequency fluctuation of the distance-Doppler intermediate frequency signal; and

[0033] (E11) Based on the existence of amplitude fluctuations in the frequency fluctuation signal that are greater than or equal to the lower limit frequency difference limit, it is determined that there is object activity in the effective detection space.

[0034] In one embodiment, step (E11) includes the step of:

[0035] (E111) The frequency fluctuation signal is processed by frequency selective filtering to obtain the frequency fluctuation signal in a frequency range with an amplitude fluctuation frequency less than or equal to 10Hz; and

[0036] (E112) Based on the frequency fluctuation signal after frequency selective filtering, if there is an amplitude fluctuation greater than or equal to the lower limit frequency difference limit, it is determined that there is human activity in the effective detection space.

[0037] In one embodiment, step (E) includes the step of:

[0038] (E20) Perform a Fourier transform on the range-Doppler intermediate frequency signal to obtain the time-dimensional distribution information of the frequency values ​​of each frequency component of the range-Doppler intermediate frequency signal; and

[0039] (E21) Based on the distribution information of the frequency value of the distance Doppler intermediate frequency signal of at least one frequency component in the time dimension, a frequency value fluctuation greater than or equal to the lower limit frequency difference limit is used to determine that there is an object activity in the effective detection space.

[0040] In one embodiment, in step (E21), the presence of human activity in the effective detection space is determined based on the distribution information of the frequency value of the distance Doppler intermediate frequency signal of at least one frequency component in the time dimension having a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, and the fluctuation frequency of the frequency value of the distance Doppler intermediate frequency signal of that frequency component in the time dimension being less than or equal to a frequency range of 10 Hz.

[0041] In one embodiment, step (E) includes the step of:

[0042] (E30) Perform a Fourier transform on the range-Doppler intermediate frequency signal to obtain the distribution information of the initial phase of the range-Doppler intermediate frequency signal of each frequency component in the time dimension; and

[0043] (E31) Based on the distribution information of the initial phase of the distance Doppler intermediate frequency signal of at least one frequency component in the time dimension, if the fluctuation is greater than or equal to the lower limit phase difference limit, it is determined that there is object activity in the effective detection space.

[0044] In one embodiment, step (E) includes the step of:

[0045] (E40) Perform a Fourier transform on the range-Doppler intermediate frequency signal to obtain the time-dimension distribution information of the frequency values ​​of the range-Doppler intermediate frequency signal for each frequency component, and obtain the time-dimension distribution information of the initial phase of the range-Doppler intermediate frequency signal for each frequency component; and

[0046] (E41) The presence of an object in the effective detection space is determined based on at least one of the following conditions: the distribution information of the frequency value of the distance Doppler intermediate frequency signal of at least one frequency component in the time dimension has a frequency value fluctuation greater than or equal to the lower limit frequency difference limit; and the distribution information of the initial phase of the distance Doppler intermediate frequency signal of at least one frequency component in the time dimension has a fluctuation greater than or equal to the lower limit phase difference limit.

[0047] In one embodiment, in step (E41), it is determined that there is object activity in the effective detection space based on the distribution information of the frequency value of the range Doppler intermediate frequency signal of at least one frequency component in the time dimension not having a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, and the distribution information of the initial phase of the range Doppler intermediate frequency signal of that frequency component in the time dimension having a fluctuation greater than or equal to the lower limit phase difference limit.

[0048] In one embodiment, in step (E41), the presence of human activity in the effective detection space is determined based on the distribution information of the frequency value of the range-Doppler intermediate frequency signal of at least one frequency component in the time dimension, which does not have a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, and the distribution information of the initial phase of the range-Doppler intermediate frequency signal of the frequency component in the time dimension, which has a fluctuation greater than or equal to the lower limit phase difference limit, and the fluctuation frequency of the initial phase of the range-Doppler intermediate frequency signal of the frequency component in the time dimension being less than or equal to a frequency range of 10 Hz.

[0049] In one embodiment, step (E) includes the step of:

[0050] (E50) Perform a Fourier transform on the Doppler intermediate frequency signal to obtain the time-dimension distribution information of the frequency values ​​of the Doppler intermediate frequency signal for each frequency component; and

[0051] (E51) Based on the distribution information of the frequency value of the Doppler intermediate frequency signal of at least one frequency component less than or equal to the upper limit frequency limit in the time dimension, the frequency value fluctuation of the signal is greater than or equal to the lower limit frequency difference limit, and it is determined that there is an object activity in the effective detection space.

[0052] In one embodiment, in step (E51), the presence of human activity in the effective detection space is determined based on the distribution information of the frequency value of the Doppler intermediate frequency signal of at least one frequency component less than or equal to the upper limit frequency limit in the time dimension, which has a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, and the fluctuation frequency of the frequency value of the Doppler intermediate frequency signal of that frequency component in the time dimension is less than or equal to a frequency range of 10 Hz.

[0053] In one embodiment, step (E) includes the step of:

[0054] (E60) Perform a Fourier transform on the Doppler intermediate frequency signal to obtain the distribution information of the initial phase of the Doppler intermediate frequency signal in the time dimension for each frequency component; and

[0055] (E61) Based on the distribution information of the initial phase of the Doppler intermediate frequency signal in the time dimension of at least one frequency component less than or equal to the upper limit frequency limit, the fluctuation of the signal is greater than or equal to the lower limit phase difference limit, and it is determined that there is object activity in the effective detection space.

[0056] In one embodiment, step (E) includes the step of:

[0057] (E70) Perform a Fourier transform on the Doppler intermediate frequency signal to obtain the distribution information of the frequency values ​​of the Doppler intermediate frequency signal of each frequency component in the time dimension, and obtain the distribution information of the initial phase of the Doppler intermediate frequency signal of each frequency component in the time dimension; and

[0058] (E71) The presence of an object in the effective detection space is determined based on at least one of the following conditions: the distribution information of the frequency value of the Doppler intermediate frequency signal of at least one frequency component less than or equal to the upper limit frequency limit in the time dimension has a frequency value fluctuation greater than or equal to the lower limit frequency difference limit; and the distribution information of the initial phase of the Doppler intermediate frequency signal of at least one frequency component less than or equal to the upper limit frequency limit in the time dimension has a fluctuation greater than or equal to the lower limit phase difference limit.

[0059] In one embodiment, in step (E71), the presence of an object in the effective detection space is determined based on the fact that the distribution information of the frequency value of the Doppler intermediate frequency signal of at least one frequency component less than or equal to the upper limit frequency limit in the time dimension does not have a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, and the distribution information of the initial phase of the Doppler intermediate frequency signal of that frequency component in the time dimension has a phase fluctuation greater than or equal to the lower limit phase difference limit.

[0060] In one embodiment, in step (E71), the presence of human activity in the effective detection space is determined based on the distribution information of the frequency value of the Doppler intermediate frequency signal of at least one frequency component less than or equal to the upper limit frequency limit in the time dimension, which does not have frequency fluctuations greater than or equal to the lower limit frequency difference limit, and the distribution information of the initial phase of the Doppler intermediate frequency signal of the frequency component in the time dimension which has fluctuations greater than or equal to the lower limit phase difference limit, and the frequency fluctuation frequency of the initial phase of the Doppler intermediate frequency signal of the frequency component in the time dimension being less than or equal to 10 Hz.

[0061] In one embodiment, in step (D), when the frequency value of the Doppler intermediate frequency signal of at least one frequency component has a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, and / or the initial phase of the Doppler intermediate frequency signal of at least one frequency component has an initial phase fluctuation greater than or equal to the lower limit phase difference limit, the upper limit frequency limit is set based on the instruction to set the upper limit frequency limit, using one of the minimum and maximum frequencies in the frequency component as the upper limit frequency limit.

[0062] In one embodiment, in step (D), when the frequency value of the Doppler intermediate frequency signal of at least one frequency component has a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, and / or the initial phase of the Doppler intermediate frequency signal of at least one frequency component has an initial phase fluctuation greater than or equal to the lower limit phase difference limit, the upper limit frequency limit is set based on the instruction to set the upper limit frequency limit, using the minimum frequency in the frequency component as the upper limit frequency limit.

[0063] In one embodiment, the Doppler microwave detection method with defined detection boundaries further includes the step of controlling the state of at least one electrical device based on the detection result of the presence of object activity within the effective detection space.

[0064] The further objects and advantages of the invention will become fully apparent from the following description and accompanying drawings.

[0065] 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

[0066] Figure 1 This is a partial logic diagram of a Doppler microwave detection method with defined detection boundaries according to an embodiment of the present invention under static conditions.

[0067] Figure 2 This is a partial logic diagram of the Doppler microwave detection method with defined detection boundaries according to the above embodiments of the present invention under a static environment.

[0068] Figure 3 This is a partial logic diagram of the Doppler microwave detection method with defined detection boundaries according to the above embodiments of the present invention in a dynamic environment.

[0069] Figure 4 This is a graph showing the frequency of the excitation signal versus time based on different piecewise linear frequency modulation methods.

[0070] Figure 5This is a logic block diagram of a Doppler microwave detection method with defined detection boundaries according to an embodiment of the present invention.

[0071] Figure 6 This is a logic block diagram of a Doppler microwave detection method with defined detection boundaries according to another embodiment of the present invention.

[0072] Figure 7 This is a logic block diagram of a Doppler microwave detection method with defined detection boundaries according to another embodiment of the present invention.

[0073] Figure 8 This is a logic block diagram of a Doppler microwave detection method with defined detection boundaries according to another embodiment of the present invention.

[0074] Figure 9 This is a logic block diagram of a Doppler microwave detection method with defined detection boundaries according to another embodiment of the present invention.

[0075] Figure 10 This is a logic block diagram of a Doppler microwave detection method with defined detection boundaries according to another embodiment of the present invention.

[0076] Figure 11 This is a logic block diagram of a Doppler microwave detection method with defined detection boundaries according to another embodiment of the present invention.

[0077] Figure 12 This is a schematic diagram of an application scenario of the Doppler microwave detection method with defined detection boundaries according to these embodiments of the present invention. Detailed Implementation

[0078] 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.

[0079] 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.

[0080] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0081] This invention provides a Doppler microwave detection method with a defined detection boundary. Specifically, it involves segmented linear frequency modulation (MLFM) of an excitation signal from a microwave detection module, transmitting a microwave beam in a segmented MLFM configuration, and receiving at least one reflected echo from the microwave beam formed by reflection from at least one object to generate an echo signal corresponding to the reflected echo. Furthermore, it generates a Doppler intermediate frequency (IF) signal in a time-domain signal format using a mixing and detection method, corresponding to the frequency and phase differences between the excitation signal and the echo signal. Specifically, the frequency of the Doppler IF signal is a discrete state of the frequency difference between the excitation signal and each of the echo signals, and the initial phase of the Doppler IF signal is the Doppler frequency of each frequency component. The discrete state of the phase difference between the excitation signal and the corresponding echo signal at the time point corresponding to the start of the Doppler intermediate frequency signal, wherein the coverage space of the microwave beam is the actual detection space of the microwave detection module, then the different frequency components of the Doppler intermediate frequency signal in the time domain correspond to different distances between the object in the actual detection space and the corresponding microwave detection module. In this way, based on the corresponding limit value of the Doppler intermediate frequency signal in the frequency domain, an upper limit frequency limit is set in the actual detection space to define the outer boundary of an effective detection space, thereby forming an effective detection space defined by the detection distance, so that the effective detection space has a definite boundary.

[0082] Furthermore, when any object moves within the actual detection space, the frequency and initial phase of the Doppler intermediate frequency signal fluctuate in the time domain. This allows for the determination of object activity within the effective detection space based on further limit settings for the frequency and / or initial phase of the Doppler intermediate frequency signal, using a lower limit frequency difference limit and / or a lower limit phase difference limit. When the Doppler intermediate frequency signal corresponding to frequency components less than or equal to the upper limit frequency limit has frequency fluctuations greater than or equal to the lower limit frequency difference limit, or has initial phase fluctuations greater than or equal to the lower limit phase difference limit, it is determined that object activity exists within the effective detection space.

[0083] Please refer to the accompanying drawings of this invention for details. Figure 1 As shown, the excitation signal of the microwave detection module is segmented into linear frequency modulation (LFM), specifically illustrated by a triangular wave-shaped LFM state. The relationship between the excitation signal, the echo signal, and the Doppler intermediate frequency signal is illustrated in the graph. In the graph showing the frequency variation of the excitation signal over time, T... Cf is the sweep period of a segment of the excitation signal in a piecewise linear frequency modulation configuration. C The scanning bandwidth of the excitation signal described in this section, i.e., in T C Within this section, the frequency f of the excitation signal... S The function that changes with time t is f S (t)=f0+f C ·t / T C Where f0 is the excitation signal described in this segment at T C The starting frequency within the interval corresponds to the amplitude of the excitation signal in that segment changing over time. The time-domain expression of the excitation signal in that segment can be represented as U. S (t)=sin(2π·f S (t)·t+Φ1). For a single static object, based on the transmission time τ of the microwave beam and the reflected echo, in the state where the excitation signal is piecewise linearly frequency modulated, the frequency f of the echo signal is... E The function that changes with time is f E (t)=f S (t-τ), corresponding to the time-domain expression of the echo signal, can be represented as U E (t)=sin(2π·f E (t)·t+Φ2), that is, the excitation signal and the echo signal have a frequency difference f. S (t)-f E (t)=f C ·τ / T c The phase difference Φ1-Φ2=2πf0·τ, corresponding to the expression of the Doppler intermediate frequency signal in the time domain, can be expressed as U B (t)=sin(2π·f C ·τ·t / T c +2πf0·τ), that is, the frequency f of the Doppler intermediate frequency signal. B =f C ·τ / T c The initial phase is 2πf0·τ, where τ is related to the distance d between the object and the microwave detection module, i.e., τ = 2d / c, where c is the speed of light. Then U B (t)=sin(2π·f B ·t+4πdf0 / c), where f B =2f C ·d / c·T C In other words, the frequency of the Doppler intermediate frequency signal is directly proportional to the distance between the object and the microwave detection module.

[0084] Understandably, corresponding to Figure 2Since in practical applications, the actual detection space often contains multiple objects, meaning the frequency of the Doppler intermediate frequency signal is a discrete state of the frequency difference between the excitation signal and each echo signal, and thus has at least one frequency component, when the time-domain signal of the Doppler intermediate frequency signal is converted into a frequency-domain signal through Fourier transform, the Doppler intermediate frequency signal has at least one peak in the frequency domain. Each peak corresponds to a frequency component of the Doppler intermediate frequency signal and is based on T... C Since the time width has a certain bandwidth, the frequency of the Doppler intermediate frequency signal is directly proportional to the distance between the corresponding object and the microwave detection module. Different frequency components of the Doppler intermediate frequency signal in the time domain correspond to different distances between the corresponding object and the microwave detection module in the actual detection space. In this way, based on the corresponding limit value of the Doppler intermediate frequency signal in the frequency domain, the outer boundary of the effective detection space can be defined by the upper limit frequency value, and the effective detection space defined by the detection distance can be formed, so that the effective detection space has a definite boundary.

[0085] Furthermore, corresponding to Figure 3 When an object moves within the actual detection space, the Doppler effect will cause changes in the frequency and phase of the echo signal, specifically based on the time-domain expression U of the Doppler intermediate frequency signal. B (t)=sin(2π·f B ·t+4πdf0 / c), where f B =2f C ·d / c·T C The understanding is that the change in distance Δd between the corresponding object and the microwave detection module will cause the frequency value of the Doppler intermediate frequency signal of the corresponding frequency component to change within the bandwidth of the frequency component, and at the same time cause the initial phase of the Doppler intermediate frequency signal of the corresponding frequency component to change. When there is motion of the object in the actual detection space, the frequency value and initial phase of the Doppler intermediate frequency signal of the corresponding frequency component have fluctuations in the time domain. Thus, based on the further setting of the frequency and / or initial phase limits of the Doppler intermediate frequency signal, the activity of the object in the effective detection space can be judged by the lower limit frequency difference limit and / or the lower limit phase difference limit. When the Doppler intermediate frequency signal of the frequency component corresponding to the frequency component less than or equal to the upper limit frequency limit has a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, or has an initial phase fluctuation greater than or equal to the lower limit phase difference limit, it is determined that there is activity of the object in the effective detection space.

[0086] Specifically, the Doppler microwave detection method with defined detection boundaries according to the present invention includes the following steps:

[0087] A. A segmented linear frequency modulated excitation signal is used to transmit a microwave beam in a linear frequency modulated form, wherein the coverage space of the microwave beam is the actual detection space;

[0088] B. Receive at least one reflected echo formed by the microwave beam being reflected by at least one object in the actual detection space and generate an echo signal corresponding to the reflected echo.

[0089] C. A Doppler intermediate frequency (IF) signal corresponding to the frequency and phase difference between the excitation signal and the echo signal is generated in the time domain form by frequency mixing and detection. That is, the frequency of the Doppler IF signal is a discrete state of the frequency difference between the excitation signal and each echo signal and has at least one frequency component. The initial phase of the Doppler IF signal is a discrete state of the phase difference between the excitation signal and the corresponding echo signal at the time point corresponding to the starting point of the Doppler IF signal of each frequency component.

[0090] D. Based on the frequency limit setting of the Doppler intermediate frequency signal, an upper frequency limit is used to define the outer boundary of an effective detection space within the actual detection space; and

[0091] E. Based on the frequency and / or initial phase limit settings of the Doppler intermediate frequency signal, determine the object activity in the effective detection space using a lower limit frequency difference limit and / or a lower limit phase difference limit. If the Doppler intermediate frequency signal corresponding to a frequency component less than or equal to the upper limit frequency limit has a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, or has an initial phase fluctuation greater than or equal to the lower limit phase difference limit, it is determined that there is object activity in the effective detection space.

[0092] It is worth mentioning that, in step (A), the segmented linear frequency modulation of the excitation signal includes, but is not limited to, triangular wave frequency modulation, sawtooth wave frequency modulation, stepped wave frequency modulation, and coded frequency modulation.

[0093] Example, referring to the accompanying drawings of the specification of the present invention. Figure 4 As shown, the frequency of the excitation signal varies with time based on different piecewise linear frequency modulation methods, where T... C f is the sweep period of a segment of the excitation signal in a piecewise linear frequency modulation configuration. C The scanning bandwidth of the excitation signal described in this section, i.e., in T C Within this section, the frequency f of the excitation signal... S The function that changes with time t is f S (t)=f0+f C ·t / T C Where f0 is the excitation signal described in this segment at T CThe starting frequency within. It is worth mentioning that, in some embodiments of the present invention, the scanning bandwidth T of each segment of the excitation signal formed by piecewise linear frequency modulation of the excitation signal... C Scan bandwidth f C And the starting frequency f0 is not limited to the same, that is, based on the relationship f B =2f C ·d / c·T C The frequency f of the Doppler intermediate frequency signal at different time periods B The proportionality coefficient 2f between the distance d between the corresponding object and the microwave detection module. C / c·T C Not limited to the same, but can also be based on 2f C / c·T C By analyzing the changes over different time periods, the proportional relationship of frequency components corresponding to the distance d between the same object and the microwave detection module in the Doppler intermediate frequency signal at different time periods is obtained to form a superposition analysis of the Doppler intermediate frequency signal. Therefore, in step (D), the outer boundary of the effective detection space can be defined in the actual detection space by the corresponding upper limit frequency limit, and in step (E), the activity of objects in the effective detection space can be judged by the corresponding lower limit frequency difference limit and / or the corresponding lower limit phase difference limit. This is also beneficial for determining the object activity based on different 2f values. C / c·T C The corresponding relationship between detection speed and / or accuracy improves the detection accuracy and applicability of the Doppler microwave detection method with defined detection boundaries, but the present invention does not limit this.

[0094] Preferably, the piecewise linear frequency modulation of the excitation signal is periodic, such as corresponding to Figure 1 The illustrated triangular wave frequency modulation uses two scan periods T of the two adjacent segments of the excitation signal. C For the minimum period, or corresponding to Figure 4 The illustrated sawtooth wave frequency modulation is based on a scan period T of the excitation signal. C For the minimum period, or corresponding to Figure 4 The illustrated stepped wave frequency modulation has different scan periods T C The multiple excitation signals are the excitation signals with the smallest period, so as to form a periodic piecewise linear frequency modulation of the excitation signals, thereby allowing the detection accuracy of the Doppler microwave detection method with defined detection boundaries to be improved in steps (D) and (E) based on the periodic data superposition analysis of the Doppler intermediate frequency signals.

[0095] Specifically, corresponding to the accompanying drawings of this invention... Figure 5As shown, a logic block diagram of a Doppler microwave detection method with a defined detection boundary according to an embodiment of the present invention is illustrated. In this embodiment of the present invention, according to step (D), a range Doppler intermediate frequency signal is generated by selecting a Doppler intermediate frequency signal with a frequency component less than or equal to the upper limit frequency limit by means of frequency selective filtering. The range Doppler intermediate frequency signal only represents the effective detection space, and the effective detection space is defined by setting the upper limit frequency limit based on the setting of the corresponding filtering parameters.

[0096] Further, step (E) includes the step of:

[0097] E10. Based on the frequency change of the distance-Doppler intermediate frequency signal over time, the distance-Doppler intermediate frequency signal is converted into a frequency fluctuation signal. The amplitude fluctuation of the frequency fluctuation signal corresponds to the frequency fluctuation of the distance-Doppler intermediate frequency signal.

[0098] E11. Based on the existence of amplitude fluctuations in the frequency fluctuation signal that are greater than or equal to the lower limit frequency difference limit, it is determined that there is object activity in the effective detection space.

[0099] It is understood that by converting the distance-Doppler intermediate frequency signal into a frequency fluctuation signal based on the frequency change of the distance-Doppler intermediate frequency signal over time, the amplitude fluctuation of the frequency fluctuation signal corresponds to the discrete state of the frequency fluctuation of the distance-Doppler intermediate frequency signal with different frequency components, thus characterizing the distance change characteristics between different objects in the effective detection space and the microwave detection module over time. The periodic change in distance between the object and the microwave detection module is based on the periodic movement of the object, and the amplitude fluctuation frequency of the frequency fluctuation signal corresponds to the movement frequency of the corresponding object. This allows for the selection of the amplitude fluctuation frequency of the frequency fluctuation signal within a frequency range less than or equal to 10 Hz based on frequency selective filtering. When there is an amplitude fluctuation greater than or equal to the lower limit frequency difference in the frequency fluctuation signal after frequency selective filtering, this amplitude fluctuation in the frequency fluctuation signal after frequency selective filtering corresponds to an action with an action frequency within the 10 Hz frequency range, and can very likely characterize the breathing and heartbeat of a human body in the effective detection space. Therefore, it is suitable for accurately and stably detecting the presence of a human body and intelligently controlling corresponding electrical equipment based on the detection of the human body's presence.

[0100] Correspondingly, step (E11) includes the following steps:

[0101] E111. The frequency fluctuation signal is processed by frequency selective filtering to obtain the frequency fluctuation signal in a frequency range with an amplitude fluctuation frequency less than or equal to 10Hz; and

[0102] E112. Based on the frequency fluctuation signal after frequency selective filtering, if there is an amplitude fluctuation greater than or equal to the lower limit frequency difference limit, it is determined that there is human activity in the effective detection space.

[0103] Furthermore, refer to the accompanying drawings of the specification of this invention. Figure 6 As shown, a logic block diagram of a Doppler microwave detection method with a defined detection boundary according to another embodiment of the present invention is illustrated. Similarly, in this embodiment of the present invention, according to step (D), a range Doppler intermediate frequency signal is generated by selecting the Doppler intermediate frequency signal with a frequency component less than or equal to the upper limit frequency limit by means of frequency selective filtering. The range Doppler intermediate frequency signal only characterizes the effective detection space, and the effective detection space is defined by setting the upper limit frequency limit based on the setting of the corresponding filtering parameters.

[0104] Specifically, step (E) includes the following steps:

[0105] E20. Perform a Fourier transform on the range-Doppler intermediate frequency signal to obtain the time-dimension distribution information of the frequency values ​​of the range-Doppler intermediate frequency signal for each frequency component. The time-dimension distribution information of the frequency values ​​of the range-Doppler intermediate frequency signal for each frequency component corresponds to the time-dimension fluctuation information of the distance between the corresponding object and the microwave detection module within the effective detection space, defined by distance resolution.

[0106] E21. Based on the distribution information of the frequency value of the distance Doppler intermediate frequency signal of at least one frequency component in the time dimension, if the frequency value fluctuation is greater than or equal to the lower limit frequency difference limit, it is determined that there is object activity in the effective detection space.

[0107] It is understood that performing a Fourier transform on the range-Doppler intermediate frequency signal to obtain the time-dimensional distribution information of the frequency values ​​of the range-Doppler intermediate frequency signal for each frequency component corresponds to the time-dimensional fluctuation information of the distance between the corresponding object and the microwave detection module within the effective detection space, defined by the distance resolution. That is, the fluctuation frequency of the time-dimensional frequency value fluctuation of the range-Doppler intermediate frequency signal for each frequency component corresponds to the motion frequency of the corresponding object within the effective detection space, defined by the distance resolution. Thus, the frequency distribution information of the range-Doppler intermediate frequency signal for at least one frequency component... The frequency fluctuation of the distance Doppler intermediate frequency signal in the time dimension is greater than or equal to the lower limit frequency difference limit. When the frequency fluctuation frequency of the distance Doppler intermediate frequency signal of the frequency component is less than or equal to 10 Hz and corresponds to an action with an action frequency in the 10 Hz frequency range, the frequency fluctuation of the distance Doppler intermediate frequency signal of the frequency component in the time dimension is highly likely to characterize the breathing and heartbeat of the human body in the effective detection space. Furthermore, the distance between the human body and the corresponding microwave detection module can be determined according to the frequency component. Therefore, it is suitable for accurately and stably detecting the presence of the human body and intelligently controlling the corresponding electrical equipment based on the detection of the presence of the human body.

[0108] Therefore, in this embodiment of the present invention, in step (E21), the presence of human activity in the effective detection space is determined based on the distribution information of the frequency value of the distance Doppler intermediate frequency signal of at least one frequency component in the time dimension having a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, and the fluctuation frequency of the frequency value of the distance Doppler intermediate frequency signal of the frequency component in the time dimension being less than or equal to a frequency range of 10 Hz.

[0109] Furthermore, refer to the accompanying drawings of the specification of this invention. Figure 7 As shown, a logic block diagram of a Doppler microwave detection method with a defined detection boundary according to another embodiment of the present invention is illustrated. Similarly, in this embodiment of the present invention, according to step (D), a range Doppler intermediate frequency signal is generated by selecting the Doppler intermediate frequency signal with a frequency component less than or equal to the upper limit frequency limit by means of frequency selective filtering. The range Doppler intermediate frequency signal only characterizes the effective detection space, and the effective detection space is defined by setting the upper limit frequency limit based on the setting of the corresponding filtering parameters.

[0110] Specifically, step (E) includes the step of:

[0111] E30. Perform a Fourier transform on the range-Doppler intermediate frequency signal to obtain the distribution information of the initial phase of the range-Doppler intermediate frequency signal of each frequency component in the time dimension. Then, the distribution information of the initial phase of the range-Doppler intermediate frequency signal of each frequency component in the time dimension corresponds to the fluctuation information of the distance between the object and the microwave detection module in the time dimension based on the distance resolution and each frequency component within the effective detection space; and

[0112] E31. The distribution information of the initial phase of the distance Doppler intermediate frequency signal based on at least one frequency component in the time dimension has a fluctuation greater than or equal to the lower limit phase difference limit, which determines that there is object activity in the effective detection space.

[0113] It is worth mentioning that, based on the periodic characteristics of the phase, when the distribution information of the corresponding frequency component of the Doppler intermediate frequency signal in the time dimension has a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, the initial phase fluctuation of the Doppler intermediate frequency signal of that frequency component in the time dimension may exceed π, resulting in ambiguity in the feedback of the time dimension fluctuation of the distance between the corresponding object and the microwave detection module. In other words, when there is motion of an object in the actual detection space, the Doppler effect will simultaneously cause changes in the frequency and phase of the echo signal, but based on the time domain expression U of the Doppler intermediate frequency signal... B (t)=sin(2π·f B ·t+4πdf0 / c), f B =2f C ·d / c·T C The feedback accuracy of the Doppler intermediate frequency signal with respect to the activity of the corresponding object varies depending on the frequency value or initial phase change of the corresponding frequency component.

[0114] Specifically, the change in distance Δd between the corresponding object and the microwave detection module causes a change in the frequency value Δf of the corresponding frequency component of the Doppler intermediate frequency signal. B =2f C ·Δd / c·T CAs Δd increases, the initial phase change of the corresponding frequency component of the Doppler intermediate frequency signal, ΔΦ = 4πΔdf0 / c, also increases periodically with the increase of Δd. Therefore, when the change in distance Δd between the object and the microwave detection module is small, and the resulting change in the frequency value of the Doppler intermediate frequency signal of the corresponding frequency component is small and difficult to identify, if the distribution information of the frequency value of the Doppler intermediate frequency signal of the frequency component in the time dimension has a frequency value fluctuation less than the lower limit frequency difference limit, the distribution information of the initial phase of the Doppler intermediate frequency signal of the frequency component in the time dimension provides relatively higher feedback accuracy for the fluctuation of the distance between the object and the microwave detection module in the time dimension. However, when the change in distance Δd between the object and the microwave detection module is large, if the distribution information of the frequency value of the Doppler intermediate frequency signal of the corresponding frequency component in the time dimension has a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, the fluctuation of the initial phase of the Doppler intermediate frequency signal of the frequency component in the time dimension may exceed π, which can only characterize the change in distance between the object and the microwave detection module, but cannot specifically characterize the amount of distance change between the object and the microwave detection module.

[0115] Therefore, in some embodiments of the present invention, in step (E), based on the frequency and initial phase limits set for the Doppler intermediate frequency signal, the activity of an object within the effective detection space is determined by a combination of the lower limit frequency difference limit and the lower limit phase difference limit. For example, based on at least one of the following conditions: the Doppler intermediate frequency signal with frequency components less than or equal to the upper limit frequency limit has frequency fluctuations greater than or equal to the lower limit frequency difference limit; and the Doppler intermediate frequency signal has initial phase fluctuations greater than or equal to the lower limit phase difference limit, it is determined that there is activity within the effective detection space. This is beneficial for improving the detection accuracy of the Doppler microwave detection method with defined detection boundaries.

[0116] Specifically, refer to the accompanying drawings of the specification of this invention. Figure 8 As shown, a logic block diagram of a Doppler microwave detection method with a defined detection boundary according to another embodiment of the present invention is illustrated. Similarly, in this embodiment of the present invention, according to step (D), a range Doppler intermediate frequency signal is generated by selecting the Doppler intermediate frequency signal with a frequency component less than or equal to the upper limit frequency limit by means of frequency selective filtering. The range Doppler intermediate frequency signal only characterizes the effective detection space, and the effective detection space is defined by setting the upper limit frequency limit based on the setting of the corresponding filtering parameters.

[0117] Further, step (E) includes the step of:

[0118] E40. Perform a Fourier transform on the range-Doppler intermediate frequency signal to obtain the time-dimension distribution information of the frequency values ​​of the range-Doppler intermediate frequency signal for each frequency component, and obtain the time-dimension distribution information of the initial phase of the range-Doppler intermediate frequency signal for each frequency component; and

[0119] E41. Based on the fact that the distribution information of the frequency value of the range Doppler intermediate frequency signal of at least one frequency component in the time dimension does not have a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, and the distribution information of the initial phase of the range Doppler intermediate frequency signal of that frequency component in the time dimension has a fluctuation greater than or equal to the lower limit phase difference limit, it is determined that there is object activity in the effective detection space.

[0120] It is worth mentioning that Fourier transform is performed on the range-Doppler intermediate frequency signal to obtain the distribution information of the frequency values ​​of the range-Doppler intermediate frequency signal of each frequency component in the time dimension, and the distribution information of the initial phase of the range-Doppler intermediate frequency signal of each frequency component in the time dimension is obtained. When the distribution information of the frequency values ​​of the range-Doppler intermediate frequency signal of at least one frequency component in the time dimension does not have a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, the fluctuation of the initial phase of the range-Doppler intermediate frequency signal of that frequency component in the time dimension is likely not to exceed π and can specifically characterize the distance change between the object and the microwave detection module. That is, the fluctuation frequency of the initial phase of the distance Doppler intermediate frequency signal of this frequency component in the time dimension corresponds to the motion frequency of the object within the effective detection space defined by the distance resolution. Thus, if the distribution information of the initial phase of the distance Doppler intermediate frequency signal of this frequency component in the time dimension has a phase fluctuation greater than or equal to the lower limit phase difference limit, and the fluctuation frequency of the initial phase of the distance Doppler intermediate frequency signal of this frequency component in the time dimension is less than or equal to a frequency range of 10 Hz, corresponding to an action frequency within a frequency range of 10 Hz, then the fluctuation of the initial phase of the distance Doppler intermediate frequency signal of this frequency component in the time dimension highly likely characterizes the breathing and heartbeat of the human body within the effective detection space, and the distance between the human body and the corresponding microwave detection module can be determined according to this frequency component. Therefore, it is suitable for accurately and stably detecting the presence of the human body, and for intelligently controlling the corresponding electrical equipment based on the detection of the human body's presence.

[0121] Therefore, in this embodiment of the present invention, in step (E41), the presence of human activity in the effective detection space is determined based on the distribution information of the frequency value of the distance Doppler intermediate frequency signal of at least one frequency component in the time dimension not having a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, and the distribution information of the initial phase of the distance Doppler intermediate frequency signal of the frequency component in the time dimension having a fluctuation greater than or equal to the lower limit phase difference limit, and the fluctuation frequency of the initial phase of the distance Doppler intermediate frequency signal of the frequency component in the time dimension being less than or equal to a frequency range of 10 Hz.

[0122] Further reference is made to the accompanying drawings of this invention. Figure 9 As shown, a logic block diagram of a Doppler microwave detection method with a defined detection boundary according to another embodiment of the present invention is illustrated. In particular, in this embodiment of the present invention, step (E) includes the following steps:

[0123] E50. Perform a Fourier transform on the Doppler intermediate frequency signal to obtain the distribution information of the frequency values ​​of the Doppler intermediate frequency signal of each frequency component in the time dimension. Then, the distribution information of the frequency values ​​of the Doppler intermediate frequency signal of each frequency component in the time dimension corresponds to the fluctuation information of the distance between the corresponding object and the microwave detection module in the time dimension, defined based on distance resolution within the actual detection space; and

[0124] E51. Based on the distribution information of the frequency value of the Doppler intermediate frequency signal of at least one frequency component less than or equal to the upper limit frequency limit in the time dimension, a frequency value fluctuation greater than or equal to the lower limit frequency difference limit is used to determine that there is object activity in the effective detection space.

[0125] Further, a Fourier transform is performed on the Doppler intermediate frequency signal to obtain the distribution information of the frequency values ​​of the Doppler intermediate frequency signal of each frequency component in the time dimension. The distribution information of the frequency values ​​of the Doppler intermediate frequency signal of each frequency component in the time dimension corresponds to the fluctuation information of the distance between the corresponding object and the microwave detection module in the time dimension, defined by distance resolution within the actual detection space. This is based on the periodic change in the distance between the object and the microwave detection module caused by periodic object movement. The fluctuation frequency of the frequency values ​​of the Doppler intermediate frequency signal of each frequency component in the time dimension corresponds to the motion frequency of the corresponding object in the actual detection space, defined by distance resolution. Thus, in a range less than or equal to... The frequency distribution information of the Doppler intermediate frequency signal of at least one frequency component of the upper frequency limit in the time dimension has a frequency value fluctuation greater than or equal to the lower frequency difference limit, and the fluctuation frequency of the frequency component in the time dimension is less than or equal to a frequency range of 10 Hz. When the action frequency is within the frequency range of 10 Hz, the frequency value fluctuation of the Doppler intermediate frequency signal of the frequency component in the time dimension is highly likely to characterize the breathing and heartbeat of the human body in the effective detection space, and the distance between the human body and the corresponding microwave detection module can be determined according to the frequency component. Therefore, it is suitable for accurately and stably detecting the presence of the human body and intelligently controlling the corresponding electrical equipment based on the detection of the presence of the human body.

[0126] Correspondingly, in this embodiment of the present invention, in step (E51), the distribution information of the frequency value of the Doppler intermediate frequency signal of at least one frequency component less than or equal to the upper limit frequency limit in the time dimension has a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, and the fluctuation frequency of the frequency value of the Doppler intermediate frequency signal of the frequency component in the time dimension is less than or equal to a frequency range of 10 Hz, it is determined that there is human activity in the effective detection space.

[0127] Further reference is made to the accompanying drawings of this invention. Figure 10 As shown, a logic block diagram of a Doppler microwave detection method with a defined detection boundary according to another embodiment of the present invention is illustrated. In particular, in this embodiment of the present invention, step (E) includes the following steps:

[0128] E60. Perform a Fourier transform on the Doppler intermediate frequency signal to obtain the distribution information of the initial phase of the Doppler intermediate frequency signal of each frequency component in the time dimension. Then, the distribution information of the initial phase of the Doppler intermediate frequency signal of each frequency component in the time dimension corresponds to the fluctuation information of the distance between the corresponding object and the microwave detection module in the time dimension within the actual detection space, defined by the distance resolution.

[0129] E61. Based on the distribution information of the initial phase of the Doppler intermediate frequency signal in the time dimension of at least one frequency component less than or equal to the upper limit frequency limit, the fluctuation of the initial phase of the Doppler intermediate frequency signal is greater than or equal to the lower limit phase difference limit, and it is determined that there is object activity in the effective detection space.

[0130] Similarly, in some embodiments of the present invention, in step (E), based on the frequency and initial phase limits set for the Doppler intermediate frequency signal, the lower limit frequency difference limit and the lower limit phase difference limit are used to determine the object activity within the effective detection space. This is based on at least one of the following conditions: the Doppler intermediate frequency signal of at least one frequency component less than or equal to the upper limit frequency limit has a frequency fluctuation greater than or equal to the lower limit frequency difference limit; and the Doppler intermediate frequency signal of at least one frequency component less than or equal to the upper limit frequency limit has an initial phase fluctuation greater than or equal to the lower limit phase difference limit. This is beneficial for improving the detection accuracy of the Doppler microwave detection method with defined detection boundaries.

[0131] Specifically, corresponding to Figure 11 A logic block diagram of a Doppler microwave detection method with a defined detection boundary according to another embodiment of the present invention is shown. In particular, in this embodiment of the present invention, step (E) includes the step:

[0132] E70. Perform a Fourier transform on the Doppler intermediate frequency signal to obtain the distribution information of the frequency values ​​of the Doppler intermediate frequency signal of each frequency component in the time dimension, and obtain the distribution information of the initial phase of the Doppler intermediate frequency signal of each frequency component in the time dimension; and

[0133] E71. Based on the fact that the distribution information of the frequency value of the Doppler intermediate frequency signal of at least one frequency component less than or equal to the upper limit frequency limit in the time dimension does not have a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, and the distribution information of the initial phase of the Doppler intermediate frequency signal of that frequency component in the time dimension has a phase fluctuation greater than or equal to the lower limit phase difference limit, it is determined that there is object activity in the effective detection space.

[0134] Furthermore, in this embodiment of the invention, in step (E71), the distribution information of the frequency value of the Doppler intermediate frequency signal of at least one frequency component less than or equal to the upper limit frequency limit in the time dimension does not have a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, and the distribution information of the initial phase of the Doppler intermediate frequency signal of the frequency component in the time dimension has a fluctuation greater than or equal to the lower limit phase difference limit, and the fluctuation frequency of the initial phase of the Doppler intermediate frequency signal of the frequency component in the time dimension is less than or equal to 10 Hz, it is determined that there is human activity in the effective detection space.

[0135] It is worth mentioning that, in these embodiments of the present invention, a step of setting the upper limit frequency limit is further included. Specifically, in step (D), when the frequency value of the Doppler intermediate frequency signal of at least one frequency component has a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, and / or the initial phase of the Doppler intermediate frequency signal of at least one frequency component has an initial phase fluctuation greater than or equal to the lower limit phase difference limit, based on the instruction to set the upper limit frequency limit, the upper limit frequency limit is set (preset or reset) with the minimum or maximum frequency in the frequency component as the upper limit frequency limit. In this way, the boundary setting of the effective detection space is simple and easy to implement, and can avoid the professional requirement of measuring and calculating the installation height of the corresponding microwave detection module, thus having better applicability.

[0136] Specifically, corresponding to Figure 12 Based on the penetrating characteristics of microwaves, in practical applications, the far end of the actual detection space is uncontrollable and may contain unknown object activity. Therefore, in the step of setting the upper limit frequency limit, preferably when the frequency value of the Doppler intermediate frequency signal of at least one frequency component has a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, and / or the initial phase of the Doppler intermediate frequency signal of at least one frequency component has an initial phase fluctuation greater than or equal to the lower limit phase difference limit, the upper limit frequency limit is set (preset or reset) based on the instruction to set the upper limit frequency limit, using the minimum frequency in that frequency component as the upper limit frequency limit. This facilitates the remote control definition of the effective detection space by the observer of the corresponding space, using the boundary of their location as the outer boundary of the effective detection space, which is simple and easy to implement.

[0137] It is worth mentioning that, in some embodiments of the present invention, based on the setting of multiple upper frequency limits, the effective detection space is divided into multiple regions to obtain the positional distribution of moving objects in the effective detection space, which is conducive to further enriching the intelligent application of the Doppler microwave detection method with defined detection boundaries.

[0138] Furthermore, in practical applications of the present invention, the number of microwave detection modules can be set to multiple, so that at least two Doppler intermediate frequency signals can be formed based on the corresponding number of microwave detection modules. This allows the distribution location information of the moving object in the effective detection space to be obtained based on the correspondence between the same moving object and the corresponding frequency components of the two Doppler intermediate frequency signals. This is beneficial for further intelligent control of the corresponding electrical equipment based on the detection of the location of the human body.

[0139] It is worth mentioning that, in these embodiments of the present invention, based on the intelligent application of the Doppler microwave detection method with defined detection boundaries, the Doppler microwave detection method with defined detection boundaries further includes the step of controlling the state of at least one electrical device based on the detection result of the presence of object activity within the effective detection space.

[0140] It will be understood by those skilled in the art that the above embodiments are merely examples, and features of different embodiments can be combined with each other to obtain implementations that are readily conceivable according to the content disclosed in the present invention but are not explicitly shown in the accompanying drawings. The present invention is not limited in this respect.

[0141] 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. A Doppler microwave detection method with defined detection boundaries, characterized in that, Includes the following steps: (A) A segmented linear frequency modulated excitation signal is used to transmit a microwave beam in a linear frequency modulated form, wherein the coverage space of the microwave beam is the actual detection space; (B) Receive at least one reflected echo formed by the microwave beam being reflected by at least one object in the actual detection space and generate an echo signal corresponding to the reflected echo. (C) A Doppler intermediate frequency signal corresponding to the frequency and phase difference between the excitation signal and the echo signal is generated in the form of a time-domain signal by means of frequency mixing and detection. That is, the frequency of the Doppler intermediate frequency signal is a discrete state of the frequency difference between the excitation signal and each of the echo signals and has at least one frequency component. The initial phase of the Doppler intermediate frequency signal is a discrete state of the phase difference between the excitation signal and the corresponding echo signal at the time point corresponding to the starting point of the Doppler intermediate frequency signal of each frequency component. (D) Based on the frequency limit setting of the Doppler intermediate frequency signal, an upper limit frequency limit is used to define the outer boundary of an effective detection space in the actual detection space; (E) Based on the frequency and / or initial phase limit settings of the Doppler intermediate frequency signal, the activity of an object in the effective detection space is determined by the lower limit frequency difference limit and / or the lower limit phase difference limit. If the Doppler intermediate frequency signal based on the frequency component less than or equal to the upper limit frequency limit has a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, or has an initial phase fluctuation greater than or equal to the lower limit phase difference limit, it is determined that there is an object activity in the effective detection space.

2. The Doppler microwave detection method with a defined detection boundary according to claim 1, wherein in step (D), a distance Doppler intermediate frequency signal is generated by selecting the Doppler intermediate frequency signal with a frequency component less than or equal to the upper limit frequency limit by means of frequency selective filtering, and the distance Doppler intermediate frequency signal only characterizes the effective detection space, thereby defining the effective detection space by setting the upper limit frequency limit based on the setting of the corresponding filtering parameters.

3. The Doppler microwave detection method with defined detection boundaries according to claim 2, wherein step (E) includes the following steps: (E10) Based on the frequency change of the distance-Doppler intermediate frequency signal over time, the distance-Doppler intermediate frequency signal is converted into a frequency fluctuation signal. The amplitude fluctuation of the frequency fluctuation signal corresponds to the frequency fluctuation of the distance-Doppler intermediate frequency signal; and (E11) Based on the existence of amplitude fluctuations in the frequency fluctuation signal that are greater than or equal to the lower limit frequency difference limit, it is determined that there is object activity in the effective detection space.

4. The Doppler microwave detection method with defined detection boundaries according to claim 3, wherein step (E11) includes the following steps: (E111) The frequency fluctuation signal is processed by frequency selective filtering to obtain the frequency fluctuation signal in a frequency range with an amplitude fluctuation frequency less than or equal to 10Hz; and (E112) Based on the frequency fluctuation signal after frequency selective filtering, if there is an amplitude fluctuation greater than or equal to the lower limit frequency difference limit, it is determined that there is human activity in the effective detection space.

5. The Doppler microwave detection method with defined detection boundaries according to claim 2, wherein step (E) includes the following steps: (E20) Perform a Fourier transform on the range-Doppler intermediate frequency signal to obtain the time-dimensional distribution information of the frequency values ​​of each frequency component of the range-Doppler intermediate frequency signal; and (E21) Based on the distribution information of the frequency value of the distance Doppler intermediate frequency signal of at least one frequency component in the time dimension, a frequency value fluctuation greater than or equal to the lower limit frequency difference limit is used to determine that there is an object activity in the effective detection space.

6. The Doppler microwave detection method with a defined detection boundary according to claim 5, wherein in step (E21), the presence of human activity in the effective detection space is determined based on the distribution information of the frequency value of the distance Doppler intermediate frequency signal of at least one frequency component in the time dimension having a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, and the fluctuation frequency of the frequency value of the distance Doppler intermediate frequency signal of the frequency component in the time dimension being less than or equal to a frequency range of 10 Hz.

7. The Doppler microwave detection method with defined detection boundaries according to claim 2, wherein step (E) includes the following steps: (E30) Perform a Fourier transform on the range-Doppler intermediate frequency signal to obtain the distribution information of the initial phase of the range-Doppler intermediate frequency signal of each frequency component in the time dimension; and (E31) Based on the distribution information of the initial phase of the distance Doppler intermediate frequency signal of at least one frequency component in the time dimension, if the fluctuation is greater than or equal to the lower limit phase difference limit, it is determined that there is object activity in the effective detection space.

8. The Doppler microwave detection method with defined detection boundaries according to claim 2, wherein step (E) includes the step of: (E40) Perform a Fourier transform on the range-Doppler intermediate frequency signal to obtain the time-dimension distribution information of the frequency values ​​of the range-Doppler intermediate frequency signal for each frequency component, and obtain the time-dimension distribution information of the initial phase of the range-Doppler intermediate frequency signal for each frequency component; and (E41) The presence of an object in the effective detection space is determined based on at least one of the following conditions: the distribution information of the frequency value of the distance Doppler intermediate frequency signal of at least one frequency component in the time dimension has a frequency value fluctuation greater than or equal to the lower limit frequency difference limit; and the distribution information of the initial phase of the distance Doppler intermediate frequency signal of at least one frequency component in the time dimension has a fluctuation greater than or equal to the lower limit phase difference limit.

9. The Doppler microwave detection method with a defined detection boundary according to claim 8, wherein in step (E41), the presence of an object in the effective detection space is determined based on the fact that the distribution information of the frequency value of the range Doppler intermediate frequency signal of at least one frequency component in the time dimension does not have a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, and the distribution information of the initial phase of the range Doppler intermediate frequency signal of that frequency component in the time dimension has a fluctuation greater than or equal to the lower limit phase difference limit.

10. The Doppler microwave detection method with a defined detection boundary according to claim 8, wherein in step (E41), the presence of human activity in the effective detection space is determined based on the distribution information of the frequency value of the distance Doppler intermediate frequency signal of at least one frequency component in the time dimension not having a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, and the distribution information of the initial phase of the distance Doppler intermediate frequency signal of the frequency component in the time dimension having a fluctuation greater than or equal to the lower limit phase difference limit, and the fluctuation frequency of the initial phase of the distance Doppler intermediate frequency signal of the frequency component in the time dimension being less than or equal to a frequency range of 10 Hz.

11. The Doppler microwave detection method with defined detection boundaries according to claim 1, wherein step (E) includes the step of: (E50) Perform a Fourier transform on the Doppler intermediate frequency signal to obtain the time-dimension distribution information of the frequency values ​​of the Doppler intermediate frequency signal for each frequency component; and (E51) Based on the distribution information of the frequency value of the Doppler intermediate frequency signal of at least one frequency component less than or equal to the upper limit frequency limit in the time dimension, the frequency value fluctuation of the signal is greater than or equal to the lower limit frequency difference limit, and it is determined that there is an object activity in the effective detection space.

12. The Doppler microwave detection method with a defined detection boundary according to claim 11, wherein in step (E51), the frequency distribution information of the Doppler intermediate frequency signal of at least one frequency component less than or equal to the upper limit frequency limit in the time dimension has a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, and the fluctuation frequency of the Doppler intermediate frequency signal of the frequency component in the time dimension is less than or equal to a frequency range of 10 Hz, it is determined that there is human activity in the effective detection space.

13. The Doppler microwave detection method with defined detection boundaries according to claim 1, wherein step (E) includes the step of: (E60) Perform a Fourier transform on the Doppler intermediate frequency signal to obtain the distribution information of the initial phase of the Doppler intermediate frequency signal in the time dimension for each frequency component; and (E61) Based on the distribution information of the initial phase of the Doppler intermediate frequency signal in the time dimension of at least one frequency component less than or equal to the upper limit frequency limit, the fluctuation of the signal is greater than or equal to the lower limit phase difference limit, and it is determined that there is object activity in the effective detection space.

14. The Doppler microwave detection method with defined detection boundaries according to claim 1, wherein step (E) includes the step of: (E70) Perform a Fourier transform on the Doppler intermediate frequency signal to obtain the distribution information of the frequency values ​​of the Doppler intermediate frequency signal of each frequency component in the time dimension, and obtain the distribution information of the initial phase of the Doppler intermediate frequency signal of each frequency component in the time dimension; and (E71) The presence of an object in the effective detection space is determined based on at least one of the following conditions: the distribution information of the frequency value of the Doppler intermediate frequency signal of at least one frequency component less than or equal to the upper limit frequency limit in the time dimension has a frequency value fluctuation greater than or equal to the lower limit frequency difference limit; and the distribution information of the initial phase of the Doppler intermediate frequency signal of at least one frequency component less than or equal to the upper limit frequency limit in the time dimension has a fluctuation greater than or equal to the lower limit phase difference limit.

15. The Doppler microwave detection method with a defined detection boundary according to claim 14, wherein in step (E71), the presence of an object in the effective detection space is determined based on the distribution information of the frequency value of the Doppler intermediate frequency signal of at least one frequency component less than or equal to the upper limit frequency limit in the time dimension, which does not have frequency value fluctuations greater than or equal to the lower limit frequency difference limit, and the distribution information of the initial phase of the Doppler intermediate frequency signal of that frequency component in the time dimension, which has phase fluctuations greater than or equal to the lower limit phase difference limit.

16. The Doppler microwave detection method with a defined detection boundary according to claim 15, wherein in step (E71), the presence of human activity in the effective detection space is determined based on the distribution information of the frequency value of the Doppler intermediate frequency signal of at least one frequency component less than or equal to the upper limit frequency limit in the time dimension, which does not have frequency value fluctuations greater than or equal to the lower limit frequency difference limit, and the distribution information of the initial phase of the Doppler intermediate frequency signal of the frequency component in the time dimension which has fluctuations greater than or equal to the lower limit phase difference limit, and the frequency fluctuation frequency of the initial phase of the Doppler intermediate frequency signal of the frequency component in the time dimension being less than or equal to 10 Hz.

17. The Doppler microwave detection method with a defined detection boundary according to any one of claims 1 to 16, wherein in step (D), when the frequency value of the Doppler intermediate frequency signal of at least one frequency component has a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, and / or the initial phase of the Doppler intermediate frequency signal of at least one frequency component has an initial phase fluctuation greater than or equal to the lower limit phase difference limit, the upper limit frequency limit is set based on the instruction to set the upper limit frequency limit, using one of the minimum and maximum frequencies in the frequency component as the upper limit frequency limit.

18. The Doppler microwave detection method with a defined detection boundary according to claim 17, wherein in step (D), when the frequency value of the Doppler intermediate frequency signal of at least one frequency component has a frequency value fluctuation greater than or equal to the lower limit frequency difference limit, and / or the initial phase of the Doppler intermediate frequency signal of at least one frequency component has an initial phase fluctuation greater than or equal to the lower limit phase difference limit, the upper limit frequency limit is set based on the instruction to set the upper limit frequency limit, using the minimum frequency in the frequency component as the upper limit frequency limit.

19. The Doppler microwave detection method with defined detection boundaries according to claim 17, further comprising the step of: controlling the state of at least one electrical device based on the detection result of the presence of object activity within the effective detection space.

Images