Near-field interference-resistant microwave detection device

Abstract

A near-field interference-resistant microwave detection device. A near field refers to a spatial range within which the distance to the near-field interference-resistant microwave detection device is smaller Rmin. The near-field interference-resistant microwave detection device, based on the dynamic ranging principle, has an equivalent configuration with Rmin as a minimum distance threshold. Correspondingly, when the near-field interference-resistant microwave detection device is configured to control a corresponding device on the basis of detection for a target moving object, the device is free from responding to object motion in the near field.

Description

Microwave detection device with near-zone interference resistance TECHNICAL FIELD

[0001] The present application relates to the field of microwave detection based on the principle of Doppler effect, and particularly relates to a microwave detection device with near-zone interference resistance. BACKGROUND

[0002] As an important hub for the connection between people and things and between things, the microwave detection technology based on the principle of Doppler effect has a unique advantage in the presence detection and behavior detection technology. It can detect the motion characteristics of moving objects, such as the action characteristics, movement characteristics, and micro-motion characteristics of people, and even the heartbeat and breathing characteristics information of people without invading the privacy of the human body. Therefore, it has a wide range of application requirements, such as intelligently adjusting the working state of the corresponding electrical equipment based on the detection results to realize the intelligent interconnection between people and things and between things.

[0003] Specifically, the corresponding microwave detector transmits a microwave beam at a fixed frequency, and receives a reflected echo formed by the reflection of the microwave beam by the corresponding object, and then generates a Doppler intermediate frequency signal corresponding to the frequency difference between the microwave beam and the reflected echo through subsequent mixing detection, and the amplitude fluctuation of the Doppler intermediate frequency signal corresponds to the Doppler effect caused by the movement of the corresponding object, so as to represent the movement of the corresponding object based on the effective amplitude of the Doppler intermediate frequency signal that meets the corresponding threshold setting, and when applied to the detection of the movement of the target detection object, it can realize the intelligent interconnection between people and objects and has wide application prospects. However, corresponding to FIG. 1, for the current microwave detector with directional radiation characteristics, on the one hand, its microwave beam still contains a back lobe located in the reverse direction of the directional radiation direction, so that the actual detection space corresponding to the microwave beam cannot usually match the target detection space in the directional radiation direction. When there is motion interference, electromagnetic interference, and self-excitation interference caused by electromagnetic shielding environment in the backward space corresponding to the back lobe in the actual detection space, such as motion interference generated by the air outlet, exhaust fan, and pipeline in the backward space, electromagnetic interference generated by the router and devices with WIFI or Bluetooth function in the backward space, and self-excitation interference caused by multipath reflection of the microwave beam by the metal surface and metal pipeline in the backward space, it causes the problem of poor precision and / or poor anti-interference performance of the current microwave detection technology based on the principle of Doppler effect; on the other hand, since the amplitude of the Doppler intermediate frequency signal is related to the energy of the reflected echo reflected by the moving object and the distance between the moving object and the microwave detector, the intensity of the above interference signal corresponding to the near zone of the microwave detector in the Doppler intermediate frequency signal is stronger, so that the target signal corresponding to the movement of the target detection object in the Doppler intermediate frequency signal is difficult to be separated and identified, and the backward space corresponding to the back lobe is usually located in the near zone of the microwave detector, so that the detection accuracy of the current microwave detector cannot be guaranteed when there is near zone interference; in addition, the boundary of the corresponding microwave beam is a gradient boundary with a certain degree of radiation energy attenuation, which has non-determinacy, that is, the actual detection space of the current microwave detector is a space with a gradient boundary as the outer boundary, which is difficult to match the corresponding target detection space in actual application, causing the defects of limited adaptability to different application scenarios and poor detection stability of the current microwave detector in actual application.

[0004] To solve the above-mentioned defects of the existing microwave detector, currently, an effective detection area is defined in the actual detection space of the microwave detector mainly by adjusting the sensitivity of the microwave detector, and the corresponding sensitivity adjustment of the microwave detector is realized by setting the corresponding threshold value of the Doppler intermediate frequency signal in amplitude. 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 is related to the distance between the moving object and the microwave detector, the size of the reflecting surface of the moving object and the moving speed, the definition of the boundary of the effective detection area based on the sensitivity adjustment of the microwave detector is limited to defining the outer boundary of the effective detection area, and cannot isolate the near area of the microwave detector from the effective detection area, and the definition of the outer boundary is not intuitive and accurate. For example, different moving objects with the same distance from the microwave detector have different amplitude feedbacks in the Doppler intermediate frequency signal due to different reflecting surface sizes and / or moving speeds, and for example, moving objects farther away from the microwave detector may have higher amplitude feedback in the Doppler intermediate frequency signal due to larger reflecting surface and / or moving speed. That is, the effective detection area defined by adjusting the sensitivity of the microwave detector is not intuitive and accurate, and the relevant microwave detector manufacturers can only give the corresponding relationship between the sensitivity level and the installation space size for the installation personnel to refer to, but even for the same installation space size, the different or changes in the environment will cause the stability of the microwave sensor with the same sensitivity level to be different or changed. Therefore, how to intuitively and accurately set the effective detection area of the microwave detector is of great significance to the applicability, stability and accuracy of the microwave detector, and is beneficial to the popularization and application of the microwave detector.

[0005] SUMMARY

[0006] One object of the present application is to provide an anti-near-zone interference microwave detection device, wherein the near zone refers to a space range with a distance less than Rmin from the anti-near-zone interference microwave detection device, and the anti-near-zone interference microwave detection device has an equivalent setting with Rmin as the minimum distance threshold based on the dynamic ranging principle, so that the effective detection area corresponds to a space range with a distance greater than or equal to Rmin from the anti-near-zone interference microwave detection device, and can exclude the interference of moving objects in the near zone on the detection result, thereby improving the anti-interference ability of the anti-near-zone interference microwave detection device based on the equivalent setting with Rmin as the minimum distance threshold, especially the anti-near-zone interference ability.

[0007] Another object of the present invention is to provide a microwave detection device that is resistant to near-field interference, wherein the microwave detection device that is resistant to near-field interference transmits a microwave beam in a periodic frequency-modulated form by periodically frequency-modulating an excitation signal of a transmitting antenna, and receives a reflected echo formed by the microwave beam being reflected by at least one object through a receiving antenna to generate an echo signal corresponding to the reflected echo, and generates a Doppler intermediate frequency signal corresponding to the frequency and / or phase difference between the excitation signal and the corresponding echo signal through a mixing detection method, wherein the coverage space of the microwave beam is taken as the actual detection space, and the frequency component f of the Doppler intermediate frequency signal in the frequency domain is B is proportional to the distance d between the moving object in the actual detection space and the microwave detection device for resisting near-field interference, so that Rmin and the corresponding frequency component f of the Doppler intermediate frequency signal are proportional to the distance d between the moving object in the actual detection space and the microwave detection device for resisting near-field interference. B1 The corresponding relationship, in f B ≥f B1 The conditions form an equivalent setting of the microwave detection device resistant to near-field interference with Rmin as the minimum distance threshold, thereby eliminating the influence of a moving object whose distance from the microwave detection device resistant to near-field interference is less than Rmin on the detection result.

[0008] Another object of the present invention is to provide a microwave detection device that is resistant to near-field interference, wherein the microwave detection device that is resistant to near-field interference uses analog filtering to filter the Doppler intermediate frequency signal with a frequency less than f B1 The signal is filtered so that the frequency component f of the Doppler intermediate frequency signal after filtering in the frequency domain is B ≥f B1 , corresponding to the formation of f B ≥f B1 The condition makes the microwave detection device resistant to near-field interference have an equivalent setting with Rmin as the minimum distance threshold, thereby eliminating the influence of a moving object whose distance from the microwave detection device resistant to near-field interference is less than Rmin on the detection result.

[0009] Another object of the present application is to provide an anti-near-zone interference microwave detection device, wherein the anti-near-zone interference microwave detection device has an equivalent setting with Rmin as the minimum distance threshold, so that the effective detection area of the anti-near-zone interference microwave detection device corresponds to a spatial range with a distance greater than or equal to Rmin from the anti-near-zone interference microwave detection device, and can exclude the interference of the moving objects in the near zone on the detection results, such as the interference caused by the activities of the upper floor or the adjacent room when the installation surface of the anti-near-zone interference microwave detection device is made of a material that can be penetrated or leaked by microwaves, the vibration / movement interference caused by the work of the wind pipe, water pipe, fan and air conditioner around the installation position, and the interference caused by the swinging of the hanging objects around the installation position, thus being beneficial to improving the anti-interference ability of the anti-near-zone interference microwave detection device based on the equivalent setting with Rmin as the minimum distance threshold, especially the anti-near-zone interference ability.

[0010] Another object of the present application is to provide an anti-near-zone interference microwave detection device, wherein Rmin is greater than 5 meters, so that the anti-near-zone interference microwave detection device has a larger near-zone shielding range and can guarantee the accuracy of the signals with a frequency greater than f B1 Another object of the present application is to provide an anti-near-zone interference microwave detection device, wherein the effective detection area corresponds to a spatial range with a distance greater than or equal to Rmin from the anti-near-zone interference microwave detection device, and can exclude the influence of the moving objects in the near zone on the detection results, that is, even if the detection sensitivity of the anti-near-zone interference microwave detection device is maintained at a high level, the influence of the moving objects in the near zone on the detection results can be effectively avoided, thus being beneficial to guaranteeing the detection accuracy of the anti-near-zone interference microwave detection device based on the high sensitivity setting, and at the same time guaranteeing the accuracy and stability of the detection results.

[0011] Another object of the present application is to provide an anti-near-zone interference microwave detection device, wherein the effective detection area corresponds to a spatial range with a distance greater than or equal to Rmin from the anti-near-zone interference microwave detection device, and can exclude the influence of the moving objects in the near zone on the detection results, that is, even if the detection sensitivity of the anti-near-zone interference microwave detection device is maintained at a high level, the influence of the moving objects in the near zone on the detection results can be effectively avoided, thus being beneficial to guaranteeing the detection accuracy of the anti-near-zone interference microwave detection device based on the high sensitivity setting, and at the same time guaranteeing the accuracy and stability of the detection results.

[0012] Another object of the present application is to provide an anti-near-zone interference microwave detection device, wherein the anti-near-zone interference microwave detection device further has an equivalent setting with Rmax as the maximum distance threshold based on the dynamic ranging principle, so that the effective detection zone corresponds to the spatial range with the distance between the anti-near-zone interference microwave detection device greater than or equal to Rmin and less than or equal to Rmax, thus excluding the influence of the moving objects in the near zone and the far zone on the detection results, thereby further improving the anti-interference capability of the anti-near-zone interference microwave detection device.

[0013] Another object of the present application is to provide an anti-near-zone interference microwave detection device, wherein the anti-near-zone interference microwave detection device further has an equivalent setting with Rmax as the maximum distance threshold based on the dynamic ranging principle, so that the effective detection zone corresponds to the spatial range with the distance between the anti-near-zone interference microwave detection device greater than or equal to Rmin and less than or equal to Rmax, thus excluding the influence of the moving objects in the near zone and the far zone on the detection results, thereby further improving the anti-interference capability of the anti-near-zone interference microwave detection device. B2 B B2 Another object of the present application is to provide an anti-near-zone interference microwave detection device, wherein the anti-near-zone interference microwave detection device further has an equivalent setting with Rmax as the maximum distance threshold based on the dynamic ranging principle, so that the effective detection zone corresponds to the spatial range with the distance between the anti-near-zone interference microwave detection device greater than or equal to Rmin and less than or equal to Rmax, thus excluding the influence of the moving objects in the near zone and the far zone on the detection results, thereby further improving the anti-interference capability of the anti-near-zone interference microwave detection device.

[0014] Another object of the present application is to provide an anti-near-zone interference microwave detection device, wherein the anti-near-zone interference microwave detection device further has an equivalent setting with Rmax as the maximum distance threshold based on the dynamic ranging principle, so that the effective detection zone corresponds to the spatial range with the distance between the anti-near-zone interference microwave detection device greater than or equal to Rmin and less than or equal to Rmax, thus excluding the influence of the moving objects in the near zone and the far zone on the detection results, thereby further improving the anti-interference capability of the anti-near-zone interference microwave detection device. B2 B B2 B B2 Another object of the present application is to provide an anti-near-zone interference microwave detection device, wherein the anti-near-zone interference microwave detection device further has an equivalent setting with Rmax as the maximum distance threshold based on the dynamic ranging principle, so that the effective detection zone corresponds to the spatial range with the distance between the anti-near-zone interference microwave detection device greater than or equal to Rmin and less than or equal to Rmax, thus excluding the influence of the moving objects in the near zone and the far zone on the detection results, thereby further improving the anti-interference capability of the anti-near-zone interference microwave detection device.

[0015] Another object of the present application is to provide an anti-near-zone interference microwave detection device, wherein Rmax is greater than Rmin and the difference between them is less than or equal to 3 meters, so that the effective detection zone of the anti-near-zone interference microwave detection device can be further matched with the height of the human body, thereby further improving the anti-interference capability of the anti-near-zone interference microwave detection device.

[0016] ​​​​​​Another object of the present application is to provide a near-zone interference resistant microwave detection device, wherein Rmax is less than or equal to the installation height of the near-zone interference resistant microwave detection device relative to the ground, so that the near-zone interference resistant microwave detection device is suitable for vertical detection application scenarios, and the relative vibration / shaking interference of the near-zone interference resistant microwave detection device itself due to external force impact such as wind and rain is further reduced, so as to reduce the influence of the detection result.

[0017] Another object of the present application is to provide a near-zone interference resistant microwave detection device, wherein the near-zone interference resistant microwave detection device has an equivalent setting with Rmin as the minimum distance threshold by filtering out signals with a frequency less than f B1 from the Doppler intermediate frequency signal through analog filtering, or further filtering out signals with a frequency greater than f B2 from the Doppler intermediate frequency signal to have an equivalent setting with Rmax as the maximum distance threshold, wherein Rmin and Rmax of the near-zone interference resistant microwave detection device are adjustably set based on the parameter adjustment of the corresponding analog filter circuit, so as to ensure the applicability of the near-zone interference resistant microwave detection device in different installation environments.

[0018] Another object of the present application is to provide a near-zone interference resistant microwave detection device, wherein the near-zone interference resistant microwave detection device can form equivalent adjustment of Rmin and Rmax in a graphical remote control adjustment mode, so as to accurately adjust the effective detection zone by forming adjustment of the near zone and the far zone, so as to make the adjustment of the effective detection zone more intuitive and convenient based on the meaning expressed by the near zone and the far zone, and to be easily accepted and popularized.

[0019] To achieve at least one of the above objects, the present application provides a near-zone interference resistant microwave detection device, which generates a microwave beam in a periodically frequency-modulated form by periodically frequency-modulating an excitation signal of a transmitting antenna, and generates a return wave signal corresponding to a reflected return wave of the microwave beam reflected by at least one object by receiving the reflected return wave by a receiving antenna, and generates a Doppler intermediate frequency signal corresponding to the frequency and / or phase difference between the excitation signal and the corresponding return wave signal by mixing and detecting, wherein the coverage space of the microwave beam is the actual detection space, and the frequency component f B of the Doppler intermediate frequency signal in the frequency domain satisfies d=f B ·c·T Cc, where c is the speed of light, T C is the sweep period of a segment of the excitation signal in periodic frequency modulation mode, B is the scan bandwidth of the segment of the excitation signal, where the near zone is expressed as a spatial range whose distance from the near-zone interference-resistant microwave detection device is less than Rmin, and in the case where d takes the value of Rmin, the near-zone interference-resistant microwave detection device is set based on the corresponding relationship between Rmin and the corresponding frequency component f B1 of the Doppler intermediate frequency signal, and the near-zone interference-resistant microwave detection device is set to have an equivalent setting with Rmin as the minimum distance threshold based on the condition that f B ≥ f B1 , which corresponds to the case where the near-zone interference-resistant microwave detection device is set to control the corresponding equipment for detecting a target moving object, and the equipment is able to avoid responding to the movement of the object in the near zone.

[0020] In an embodiment, Rmin is greater than 2 meters.

[0021] In an embodiment, the near-zone interference-resistant microwave detection device is further set to filter out at least a portion of the signals in the Doppler intermediate frequency signal with a frequency less than f B1 in an analog filtering manner.

[0022] In an embodiment, in the case where at least a portion of the signals in the Doppler intermediate frequency signal with a frequency less than f B1 is filtered out in an analog filtering manner, the cutoff frequency of the corresponding filter circuit is greater than or equal to the value of f B corresponding to the relationship between d and f B in the case where d takes the value of 2 meters.

[0023] In an embodiment, the near-zone interference-resistant microwave detection device is further set to filter out the signals in the Doppler intermediate frequency signal with a frequency less than f B1 to form the condition that f B ≥ f B1 .

[0024] In an embodiment, Rmin is greater than 5 meters.

[0025] In an embodiment, the near-zone interference-resistant microwave detection device is further set to filter out at least a portion of the signals in the Doppler intermediate frequency signal with a frequency less than f B1 in an analog filtering manner.

[0026] In an embodiment, in the case where at least a portion of the signals in the Doppler intermediate frequency signal with a frequency less than f B1 is filtered out in an analog filtering manner, the cutoff frequency of the corresponding filter circuit is greater than or equal to the value of f corresponding to the relationship between d and fB The relationship corresponding to f B The value of .

[0027] In one embodiment, the microwave detection device for resisting near-field interference is further configured to filter the Doppler intermediate frequency signal with a frequency less than f in an analog filtering manner. B1 The signal is filtered to form f B ≥f B1 conditions.

[0028] In one embodiment, where f B ≥f B1 The condition is formed by using f in the process of digital analysis and processing of the Doppler intermediate frequency signal. B1 Formed by the setting of the minimum frequency threshold.

[0029] In one embodiment, where f B ≥f B1 The condition is formed by using the corresponding function to analyze the frequency component f of the Doppler intermediate frequency signal in the frequency domain during the digital analysis of the Doppler intermediate frequency signal. B After conversion, f B1 The value formed by substituting it into this function is equivalent to the setting of the minimum threshold.

[0030] In one embodiment, the far zone represents a spatial range where the distance from the microwave detection device to the near-zone interference resistance device is greater than Rmax. When d takes the state of Rmax, the corresponding frequency component f of the Doppler intermediate frequency signal is calculated based on Rmax. B2 The corresponding relationship, the microwave detection device for resisting near-field interference is set based on f B ≤f B2 The condition has an equivalent setting with Rmax as the maximum distance threshold.

[0031] In one embodiment, Rmax is greater than Rmin and the difference between the two is less than or equal to 3 meters.

[0032] In one embodiment, where f B ≤f B2 The condition is formed by using f in the process of digital analysis and processing of the Doppler intermediate frequency signal. B2 Formed by the setting of the maximum frequency threshold.

[0033] In one embodiment, where f B ≤f B2 The condition is formed by using the corresponding function to analyze the frequency component f of the Doppler intermediate frequency signal in the frequency domain during the digital analysis of the Doppler intermediate frequency signal. B After conversion, f B2The value formed by substituting the function is equivalent to the setting of the maximum threshold value.

[0034] In one embodiment, the microwave detection device against near-zone interference is further configured to filter out signals with a frequency greater than f B2 from the Doppler intermediate frequency signal in a simulated filtering manner to form a condition of f B ≤ f B2 .

[0035] In one embodiment, the value of Rmax is set to be less than or equal to the installation height of the microwave detection device against near-zone interference relative to the ground in a vertical detection application scenario.

[0036] In one embodiment, the values of Rmin and Rmax are adjustably set.

[0037] In one embodiment, the microwave detection device against near-zone interference is configured to adjust the values of Rmin and Rmax through the adjustment of a dial switch.

[0038] In one embodiment, the microwave detection device against near-zone interference is configured to enable adjustment of Rmin and Rmax in a graphical remote control adjustment manner.

[0039] Further purposes and advantages of the present application will be fully apparent from the following description and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0040] FIG. 1 is a schematic diagram of the application of a prior art microwave detector in an office / home environment vertical lighting control scenario.

[0041] FIG. 2 is a schematic diagram of the application of a microwave detection device against near-zone interference according to one embodiment of the present application in an office / home environment vertical lighting control scenario.

[0042] FIG. 3 is a schematic diagram of the application of the microwave detection device against near-zone interference according to the above embodiment of the present application in a semi-outdoor environment wall-mounted lighting control scenario with a near-zone shielding range greater than 2 meters in radius.

[0043] FIG. 4 is a schematic diagram of the application of the microwave detection device against near-zone interference according to the above embodiment of the present application in an indoor high installation lighting control scenario with a near-zone shielding range greater than 5 meters in radius.

[0044] FIG. 5 is a schematic diagram of the application of the microwave detection device against near-zone interference according to the above embodiment of the present application in an outdoor high installation lighting control scenario with a near-zone shielding range greater than 5 meters in radius. DETAILED DESCRIPTION

[0045] The following description is presented to enable any person skilled in the art to practice the application as claimed. Preferred embodiments are presented in the following description only as examples and modifications can be made by persons skilled in the art having the benefit of this disclosure without departing from the spirit and scope of the present application. Basic principles of the present application defined in the following description can be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the present application.

[0046] It can be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as a limitation on the number.

[0047] The present application provides an anti-near-zone interference microwave detection device, wherein the application scenario of the anti-near-zone interference microwave detection device is shown in Figure 2, the space range with a distance between the anti-near-zone interference microwave detection device and the near zone less than Rmin, the anti-near-zone interference microwave detection device has an equivalent setting with Rmin as the minimum distance threshold based on the dynamic ranging principle, so that the effective detection area of the anti-near-zone interference microwave detection device corresponds to the space range with a distance between the anti-near-zone interference microwave detection device and the near zone greater than or equal to Rmin, and the motion object in the near zone can be excluded from the interference of the detection result, such as when the installation surface of the anti-near-zone interference microwave detection device is a material that microwaves can penetrate or leak, the activities of the upper floor or the adjacent room cause interference actions, the vibration / motion interference caused by the work of the wind pipe, water pipe, fan and air conditioner around the installation position, and the interference actions caused by the swinging of the hanging objects around the installation position, so as to improve the anti-interference ability of the anti-near-zone interference microwave detection device based on the equivalent setting with Rmin as the minimum distance threshold, especially the anti-near-zone interference ability.

[0048] It is worth mentioning that, on the one hand, although the anti-near-zone interference microwave detection device is mainly applied to the vertical / horizontal detection application scene and has the directional radiation requirement, the actual emitted microwave beam still inevitably contains the back lobe located in the opposite direction of the directional radiation direction, and when the corresponding backward space of the back lobe exists the motion interference, the detection result is easily negatively affected; on the other hand, the near zone is the space range with the distance less than Rmin from the anti-near-zone interference microwave detection device, and the closer the region to the anti-near-zone interference microwave detection device, the stronger the electromagnetic wave radiation intensity generated by the anti-near-zone interference microwave detection device, and the stronger the penetration, so the interference of the near zone range, including the interference of the backward space corresponding to the aforementioned back lobe, such as when the installation surface of the anti-near-zone interference microwave detection device is the material that microwaves can penetrate or leak, the upper floor or the activity of the adjacent room causes the interference motion, the vibration / motion interference caused by the work of the wind pipe, water pipe, fan and air conditioner around the installation position, and the interference motion caused by the swinging of the hanging object around the installation position, and so on, the negative influence on the detection result is greater. But since the anti-near-zone interference microwave detection device has the equivalent setting with Rmin as the minimum distance threshold based on the dynamic ranging principle, the corresponding effective detection zone corresponds to the space range with the distance greater than or equal to Rmin from the anti-near-zone interference microwave detection device, so that the influence of the motion object in the near zone on the detection result can be excluded, especially the influence of the motion object in the space corresponding to the back lobe of the anti-near-zone interference microwave detection device in the near zone range on the detection result.

[0049] In addition, the effective detection zone corresponds to the space range with the distance greater than or equal to Rmin from the anti-near-zone interference microwave detection device, so that the influence of the motion object in the near zone on the detection result can be excluded, that is, even if the detection sensitivity of the anti-near-zone interference microwave detection device is maintained in a high state, the influence of the motion object in the near zone on the detection result can be effectively avoided, so as to facilitate the guarantee of the detection accuracy of the anti-near-zone interference microwave detection device based on the high sensitivity setting, and at the same time, the accuracy and stability of the detection result are guaranteed.

[0050] Further, in the state that the influence of the motion object in the near zone on the detection result can be excluded, based on the appropriate setting of the near zone range, the motion of the object in the effective detection zone has a high probability of corresponding to the motion of the target detection object (mainly refers to the human body / vehicle based on the current application requirement), so the anti-near-zone interference microwave detection device is optionally set to realize the intelligent control of the corresponding equipment according to whether there is a motion object in the effective detection zone, so that the instantaneity and accuracy of the response of the corresponding equipment to the motion of the target detection object can be guaranteed at the same time.

[0051] Preferably, in order to further improve the accuracy of the response of the corresponding equipment to the movement of the target detection object, the microwave detection device that is resistant to near-range interference is configured to distinguish whether the detected moving object in the effective detection area belongs to the movement of the target detection object based on at least one feature recognition algorithm, and to realize intelligent control of the corresponding equipment based on the detection result of whether the movement of the target detection object exists, so that the accuracy of the intelligent response of the corresponding equipment to the movement of the target detection object in the effective detection area can be further guaranteed.

[0052] Specifically, the microwave detection device with resistance to near-field interference generates an echo signal corresponding to the reflected echo by periodically modulating the excitation signal of a transmitting antenna, transmitting a microwave beam in a periodically frequency-modulated form through the transmitting antenna, and receiving a reflected echo formed by the microwave beam being reflected by at least one object through a receiving antenna, and generates a Doppler intermediate frequency signal corresponding to the frequency and / or phase difference between the excitation signal and the corresponding echo signal through mixing detection. The coverage space of the microwave beam is taken as the actual detection space, and the frequency component f of the Doppler intermediate frequency signal in the frequency domain is B The distance d between the moving object in the actual detection space and the microwave detection device for resisting near-field interference satisfies d=f B ·c·T C / 2B, where c is the speed of light, T C is the sweep frequency period of the excitation signal in the periodic frequency modulation form, B is the sweep bandwidth of the excitation signal in this section, so when d takes the state of Rmin, according to Rmin and the corresponding frequency component f of the Doppler intermediate frequency signal B1 The corresponding relationship, the microwave detection device for resisting near-field interference is set based on f B ≥f B1 The condition has an equivalent setting with Rmin as the minimum distance threshold, thereby eliminating the influence of a moving object whose distance from the microwave detection device resistant to near-zone interference is less than Rmin on the detection result. Correspondingly, when the microwave detection device resistant to near-zone interference is set to control the corresponding device based on the detection of the target moving object, the device can be exempted from responding to the movement of objects in the near zone.

[0053] It is understood that the transmitting antenna and the receiving antenna can be independent antennas, or can be set in a state of using the same antenna in a form of unified distribution or separate transmission and reception. The present invention does not limit this.

[0054] It is worth mentioning that the microwave detection device that is resistant to near-field interference is based on the principle of dynamic ranging. B ≥f B1 The conditions form the equivalent setting of the microwave detection device for resisting near-field interference with Rmin as the minimum distance threshold, where fB ≥f B1 The condition of f B ≥f B1 may be directly formed by setting f B as the minimum frequency threshold in the digital analysis process of the Doppler intermediate frequency signal, or equivalently formed by setting Rmin as the minimum distance threshold in the digital analysis process of the Doppler intermediate frequency signal according to the above correspondence between d and f

[0055] That is, the condition of f B ≥f B1 may be directly formed by setting f B1 as the minimum frequency threshold in the digital analysis process of the Doppler intermediate frequency signal, or equivalently formed by setting the value formed by substituting f B into the function as the minimum threshold after converting the frequency component f B1 of the Doppler intermediate frequency signal in the frequency domain by the corresponding function, and the present application does not limit this.

[0056] It is worth mentioning that the microwave detection device against near-zone interference preferably forms the condition of f B1 ≥f B by filtering and removing the signals with a frequency less than f B1 from the Doppler intermediate frequency signal through analog filtering, and the condition of f B1 ≥f B is formed by setting f B1 as the minimum frequency threshold in the digital analysis process of the Doppler intermediate frequency signal, or the condition of f B ≥f B1 is formed by setting the value formed by substituting f B into the function as the minimum threshold after converting the frequency component f B1 of the Doppler intermediate frequency signal in the frequency domain by the corresponding function, and the microwave detection device against near-zone interference of the present application can exclude the influence of static objects and moving objects in the near zone on the detection results, and at the same time further guarantee the accuracy of the signals in the Doppler intermediate frequency signal corresponding to the moving objects in the effective detection zone, thereby being beneficial to improve the detection accuracy of the microwave detection device against near-zone interference for the weak movements in the effective detection zone.

[0057] Therefore, in some embodiments of the present application, the microwave detection device against near-zone interference can optionally form the condition of f B1At least a portion of the signal is filtered out, and in the subsequent digital analysis and processing of the Doppler intermediate frequency signal, f B1 Form f for the setting of the minimum frequency threshold B ≥f B1 Conditions, or using the corresponding function to calculate the frequency component f of the Doppler intermediate frequency signal in the frequency domain B After conversion, f B1 Substituting the value formed by this function into the minimum threshold value setting forms f B ≥f B1 The conditions are as follows: B1 Form f for the setting of the minimum frequency threshold B ≥f B1 Conditions, or using the corresponding function to calculate the frequency component f of the Doppler intermediate frequency signal in the frequency domain B After conversion, f B1 Substituting the value formed by this function into the minimum threshold value setting forms f B ≥f B1 The conditions can also eliminate the influence of static objects and moving objects in the near area on the detection results, and at the same time further ensure the accuracy of the signal in the Doppler intermediate frequency signal corresponding to the moving objects in the effective detection area, thereby helping to improve the detection accuracy of the microwave detection device that is resistant to near-area interference on weak movements in the effective detection area.

[0058] Furthermore, taking the application of the microwave detection device resistant to near-field interference to the lighting control scenario as an example, the microwave detection device resistant to near-field interference has an equivalent setting state with Rmin as the minimum distance threshold based on the dynamic ranging principle. The microwave detection device resistant to near-field interference is not only suitable for the vertical lighting control scenario in the office / home environment as shown in Figure 2, but also for the wall-mounted lighting control scenario in the semi-outdoor environment as shown in Figure 3.

[0059] Specifically, when the microwave detection device resistant to near-range interference is applied to the wall-mounted lighting control scenario in the semi-outdoor environment shown in Figure 3, in addition to the vibration / motion interference around the installation surface, the main interferences include the interference of moths and mosquitoes' phototaxis, and the interference of green plants and road signs' shaking. In theory, this type of interference can be shielded based on the setting of a suitable Rmin value. However, since the near-range interference factors in the wall-mounted lighting control scenario in the semi-outdoor environment shown in Figure 3 are more complex than the near-range interference factors in the vertical lighting control scenario in the office / home environment shown in Figure 2, in fact, only when Rmin is greater than 2 meters, the accuracy of the signal in the Doppler intermediate frequency signal corresponding to the active objects in the effective detection area is applicable to the wall-mounted lighting control scenario in the semi-outdoor environment shown in Figure 3.

[0060] It is worth mentioning that, in the case of Rmin greater than 2 meters, when the Doppler IF signal is filtered by analog filtering to remove at least part of the signal with a frequency less than f B1 , the microwave detection device with anti-near-zone interference can also obtain good raindrop interference resistance performance.

[0061] That is, when the microwave detection device with anti-near-zone interference is applied to the wall-mounted lighting control scene in the semi-outdoor environment shown in FIG. 3, although the raindrop falling action can also be an interference factor, in the case of Rmin greater than 2 meters, when the Doppler IF signal is filtered by analog filtering to remove at least part of the signal with a frequency less than f B1 , for the raindrop falling action with a distance greater than 2 meters from the microwave detection device with anti-near-zone interference, on the one hand, the energy density of the interference signal formed is low, which does not distort the effective signal corresponding to the movement of the target detection object in terms of signal analysis and processing technology, and does not drown out the effective signal corresponding to the movement of the target detection object; on the other hand, the change pattern and continuity of the interference signal in the time domain are obviously different from the effective signal corresponding to the movement of the target detection object, and can be easily distinguished based on signal analysis and processing technology. Therefore, when the microwave detection device with anti-near-zone interference is applied to the wall-mounted lighting control scene in the semi-outdoor environment shown in FIG. 3, whether the microwave detection device with anti-near-zone interference has a rain-shielding protective measure within a certain range or not, the microwave detection device with anti-near-zone interference can obtain good raindrop interference resistance performance when the Doppler IF signal is filtered by analog filtering to remove at least part of the signal with a frequency less than f B1 in the case of Rmin greater than 2 meters.

[0062] In particular, in the case of Rmin greater than 2 meters, when the Doppler IF signal is filtered by analog filtering to remove at least part of the signal with a frequency less than f B1 , the cutoff frequency of the corresponding filter circuit is preferably greater than or equal to the value of f B corresponding to the relationship between d and f B in the case of d being 2 meters, so as to ensure the raindrop interference resistance performance of the microwave detection device with anti-near-zone interference and the detection accuracy of the weak movement in the effective detection zone.

[0063] Further, in some application scenarios of the anti-near-zone interference microwave detection device, for example, in the indoor high-installation lighting control scenario shown in FIG. 4 and the outdoor high-installation lighting control scenario shown in FIG. 5, the corresponding interference factors almost exist in the entire actual detection space, and it is generally considered that the accuracy and stability of the anti-near-zone interference microwave detection device in the high-installation lighting control scenario cannot be guaranteed based on the near-zone shielding idea with the setting of any Rmin value.

[0064] Specifically, in the indoor high-installation lighting control scenarios such as warehouses, workshops, stations, and airports, and the outdoor high-installation lighting control scenarios such as highways, open-air activities, and construction sites, such high-installation lighting control scenarios are prone to interference actions in the entire actual detection space, for example, but not limited to, the phototactic behavior interference of moths and mosquitoes, the interference actions caused by the shaking of shelves, the flow of rainwater, and the falling of raindrops, and especially the relative vibration / shaking interference caused by the vibration / shaking of the anti-near-zone interference microwave detection device due to external force impact such as wind and rain.

[0065] However, among the same interference actions, the closer the interference action to the anti-near-zone interference microwave detection device, the higher the energy proportion of the interference signal formed by the interference action in the Doppler intermediate frequency signal. In the state that Rmin is greater than 5 meters, since the anti-near-zone interference microwave detection device has a larger near-zone shielding range, the energy proportion of the interference signal corresponding to the foregoing interference action in the Doppler intermediate frequency signal can be greatly reduced, and at the same time, the weakening of the effective signal corresponding to the movement of the target detection object in such a high-installation lighting control scenario is not formed, thereby being able to guarantee the energy proportion of the effective signal corresponding to the movement of the target detection object in the Doppler intermediate frequency signal and correspondingly guarantee the accuracy thereof.

[0066] That is, based on the setting of Rmin, the anti-near-zone interference microwave detection device can guarantee the accuracy of the signal with a frequency greater than f B1 in the Doppler intermediate frequency signal, and in the high-installation lighting control scenario, when the value of Rmin is greater than 5 meters, the effective signal corresponding to the movement of the target detection object in the Doppler intermediate frequency signal has a higher energy proportion relative to the signal with a frequency greater than f B1 in the Doppler intermediate frequency signal, correspondingly making the accuracy of the effective signal corresponding to the movement of the target detection object in the Doppler intermediate frequency signal be guaranteed, so that the anti-near-zone interference microwave detection device is suitable for guaranteeing the detection accuracy of a weak action at a long distance in the indoor high-installation lighting control scenario shown in FIG. 4 and the outdoor high-installation lighting control scenario shown in FIG. 5.

[0067] In particular, when Rmin is greater than 5 meters, since the microwave detection device resistant to near-field interference has a larger near-field shielding range and needs to shield a larger noise energy, in order to ensure the signal-to-noise ratio of the signal corresponding to the active object in the effective detection area in the Doppler intermediate frequency signal, and to correspondingly ensure the anti-raindrop interference performance of the microwave detection device resistant to near-field interference and the detection accuracy of weak movements in the effective detection area, the microwave detection device resistant to near-field interference can be optionally further configured to filter the Doppler intermediate frequency signal with a frequency less than f by analog filtering. B1 At least a portion of the signal is filtered out, and the cutoff frequency of the corresponding filter circuit is preferably greater than or equal to the state where d is 5 meters according to d and f B The relationship corresponding to f B The value of is taken in order to ensure the anti-raindrop interference performance of the microwave detection device that is resistant to near-range interference and the detection accuracy of weak movements in the effective detection area.

[0068] Furthermore, the far zone is used to express the spatial range whose distance from the microwave detection device resistant to near-zone interference is greater than Rmax. In some embodiments of the present invention, the microwave detection device resistant to near-zone interference further has an equivalent setting with Rmax as the maximum distance threshold based on the dynamic ranging principle, so that the effective detection zone corresponds to the spatial range whose distance from the microwave detection device resistant to near-zone interference is greater than or equal to Rmin and less than or equal to Rmax, and can exclude the influence of static objects and moving objects in the near and far zones on the detection results, thereby helping to further improve the anti-interference capability of the microwave detection device resistant to near-zone interference.

[0069] Specifically, when d takes Rmax, the microwave detection device for resisting near-field interference is based on Rmax and the corresponding frequency component f of the Doppler intermediate frequency signal. B2 The corresponding relationship, in f B ≤f B2 The conditions form an equivalent setting of the microwave detection device resistant to near-field interference with Rmax as the maximum distance threshold, thereby eliminating the influence of static objects and moving objects whose distance from the microwave detection device resistant to near-field interference is greater than Rmax on the detection results.

[0070] Likewise, f B ≤f B2 The formation of the conditions can be in the process of digital analysis and processing of the Doppler intermediate frequency signal with f B2 The maximum frequency threshold is directly formed by setting the maximum frequency threshold, or the frequency component f of the Doppler intermediate frequency signal in the frequency domain is calculated by using a corresponding function in the digital analysis process of the Doppler intermediate frequency signal. B After conversion, f B2The value formed by substituting into the function is equivalent to the setting of the maximum threshold, and the present invention is not limited to this.

[0071] In particular, in the embodiment of the present invention, the microwave detection device for resisting near-field interference preferably uses analog filtering to filter the Doppler intermediate frequency signal with a frequency greater than f B2 The signal is filtered so that the frequency component f of the Doppler intermediate frequency signal after filtering in the frequency domain is B ≤f B2 , corresponding to the formation of f B ≤f B2 The condition makes the microwave detection device resistant to near-field interference have an equivalent setting with Rmax as the maximum distance threshold, thereby eliminating the influence of a moving object whose distance from the microwave detection device resistant to near-field interference is greater than Rmax on the detection result.

[0072] It is worth mentioning that the microwave detection device for resisting near-field interference uses analog filtering to filter the Doppler intermediate frequency signal with a frequency greater than f B2 The signal is filtered to form f B ≤f B2 The condition is relative to the direct digital analysis of the Doppler intermediate frequency signal with f B2 Form f for the setting of the maximum frequency threshold B ≤f B2 Conditions, or using the corresponding function to calculate the frequency component f of the Doppler intermediate frequency signal in the frequency domain B After conversion, f B2 Substituting the value formed by this function into the maximum threshold value setting forms f B ≤f B2 Under the conditions of the present invention, the microwave detection device resistant to near-zone interference can eliminate the influence of static objects and moving objects in the far area on the detection results, while further ensuring the accuracy of the signal in the Doppler intermediate frequency signal corresponding to the moving objects in the effective detection area, thereby helping to improve the detection accuracy of the microwave detection device resistant to near-zone interference on the weak movements in the effective detection area.

[0073] In particular, corresponding to the application scenarios illustrated in Figures 2 to 5, especially the indoor high-mounted lighting control scenario illustrated in Figure 4 and the outdoor high-mounted lighting control scenario illustrated in Figure 5, Rmax is greater than Rmin and preferably satisfies that the difference between the two is less than or equal to 3 meters. If the effective detection area of ​​the microwave detection device that is resistant to near-field interference can be further matched with the height of the human body, it is beneficial to improve the signal-to-noise ratio of the microwave detection device that is resistant to near-field interference, and correspondingly further improve the detection accuracy of the microwave detection device that is resistant to near-field interference for weak movements in the effective detection area.

[0074] It is worth mentioning that in the vertical detection application scenario of the near-zone interference resistant microwave detection device, for example, the vertical detection application scenarios corresponding to FIG. 2, FIG. 4 and FIG. 5, the value of Rmax is optionally set to be less than or equal to the installation height of the near-zone interference resistant microwave detection device relative to the ground (target detection surface), so that in the vertical detection application scenario, based on Rmax being less than or equal to the installation height of the near-zone interference resistant microwave detection device relative to the ground, the influence of the relative vibration / shaking interference of the near-zone interference resistant microwave detection device itself caused by external force impact such as wind and rain on the detection result is further reduced.

[0075] Further, in the digital analysis and processing of the Doppler intermediate frequency signal, f B1 and f B2 corresponding to the adjustment of Rmin and Rmax of the near-zone interference resistant microwave detection device, and in the state that the near-zone interference resistant microwave detection device has equivalent settings with Rmin as the minimum distance threshold by filtering the signals with a frequency less than f B1 in the Doppler intermediate frequency signal through analog filtering, or further filtering the signals with a frequency greater than f B2 in the Doppler intermediate frequency signal, based on the parameter adjustment of the corresponding analog filter circuit, the adjustment of Rmin and Rmax of the near-zone interference resistant microwave detection device can also be formed, so as to ensure the applicability of the near-zone interference resistant microwave detection device to different installation environments.

[0076] For example, in some embodiments of the present application, the near-zone interference resistant microwave detection device is set to form the selection of f B1 and / or f B2 by mechanical adjustment such as dial switch (code switch), or the adjustment of the parameters of the corresponding analog filter circuit, which corresponds to the adjustment of Rmin and / or Rmax of the near-zone interference resistant microwave detection device.

[0077] Preferably, the near-zone interference resistant microwave detection device is set to be able to form the adjustment of Rmin and Rmax in a graphical remote control adjustment mode, including but not limited to infrared, Bluetooth, WIFI and other remote control communication modes, which corresponds to the adjustment of the near zone and the far zone to accurately adjust the effective detection zone, so that the adjustment of the effective detection zone is more intuitive and convenient based on the meaning expressed by the near zone and the far zone, and is easy to be accepted and popularized.

[0078] Those skilled in the art should understand that, in the description of the present application, the understanding of the verbs such as "shield", "exclude" and "avoid" is only to express the execution of the corresponding action of the verbs, and the verbs themselves do not constitute a limitation on the degree of the execution effect, so the verbs themselves should not be understood as "the execution effect of the action is that the execution object completely does not exist", for example, "shielding these interference actions" is only to express that the execution object of the "shielding" action is the interference action in the near zone, and should not be understood as that the interference signal generated by the interference action in the near zone is shielded to completely disappear in the Doppler intermediate frequency signal; similarly, "excluding the influence of the moving object in the near zone on the detection result" is only to express that the execution object of the "excluding" action is "the influence of the moving object in the near zone on the detection result", which should not be understood as that the "moving object in the near zone" or "the influence of the moving object in the near zone on the detection result" is "excluded" to completely not exist; "the influence of the moving object in the near zone on the detection result can also be effectively avoided" is only to express that the object of "avoiding" is "the influence of the moving object in the near zone on the detection result", which does not constitute a limitation that "the moving object in the near zone" or "the influence of the moving object in the near zone on the detection result" is completely "avoided" and does not exist.

[0079] Those skilled in the art should understand that the embodiments of the present application shown in the above description and the drawings are only examples and do not limit the present application. The purpose of the present application has been completely and effectively achieved. The function and structural principle of the present application has been shown and explained in the embodiments, and the implementation of the present application can have any modification or modification without departing from the principle.

Claims

1. A microwave detection device against near-zone interference, characterized in that, The anti-near-zone interference microwave detection device generates a return signal corresponding to a reflected echo of a microwave beam emitted by a transmitting antenna and received by a receiving antenna, by periodically modulating an excitation signal of the transmitting antenna, emitting the microwave beam in a periodically modulated form, and receiving the reflected echo formed by the reflection of the microwave beam by at least one object, and generates a Doppler intermediate frequency signal corresponding to the frequency and / or phase difference between the excitation signal and the corresponding return signal by means of frequency mixing detection, wherein the coverage space of the microwave beam is the actual detection space, and the frequency component f B of the Doppler intermediate frequency signal in the frequency domain is proportional to the distance d between the moving object in the actual detection space and the anti-near-zone interference microwave detection device, satisfying d = f B · c · T C / 2B, where c is the speed of light, T C is the sweep period of a segment of the excitation signal in a periodically modulated form, and B is the scanning bandwidth of the segment of the excitation signal, wherein the near zone is expressed as the space range with a distance less than Rmin between the anti-near-zone interference microwave detection device, and in the state of d = Rmin, the anti-near-zone interference microwave detection device is set based on the corresponding relationship between Rmin and the corresponding frequency component f B1 of the Doppler intermediate frequency signal, and the anti-near-zone interference microwave detection device is set to have an equivalent setting with Rmin as the minimum distance threshold based on the condition f B ≥ f B1 , corresponding to the situation that the corresponding equipment for the detection control of the target moving object is able to be exempted from responding to the object motion in the near zone.

2. The near-zone interference resistant microwave probe of claim 1, wherein Rmin is greater than 2 meters.

3. The near-field resistant microwave probe of claim 2, wherein the near-field resistant microwave probe is further configured to filter out at least a portion of the Doppler intermediate frequency signal having a frequency less than f B1 in a simulated filter manner.

4. The near-zone interference resistant microwave probe device according to claim 3, wherein when the at least a portion of the Doppler IF signal having a frequency less than f B1 is filtered out in an analog filtering manner, a cutoff frequency of a corresponding filter circuit is equal to or greater than a value of f B corresponding to a relationship between d and f B in a state where d is 2 meters.

5. The near-field interference resistant microwave detecting apparatus according to claim 2, wherein the near-field interference resistant microwave detecting apparatus is further configured to filter out signals having a frequency less than f B1 from the Doppler intermediate frequency signals in a manner simulating filtering to form signals having a frequency of f B ≥ f B1 .

6. The near-zone interference resistant microwave probe of claim 1, wherein Rmin is greater than 5 meters.

7. The near-field resistant microwave detection apparatus of claim 6, wherein the near-field resistant microwave detection apparatus is further configured to filter out at least a portion of the Doppler intermediate frequency signal having a frequency less than f B1 in an analog filtering manner.

8. The near-zone interference-resistant microwave detection apparatus according to claim 7, wherein when the at least a portion of the Doppler intermediate frequency signal having a frequency less than f is filtered out in an analog filter manner, a cutoff frequency of a corresponding filter circuit is equal to or greater than a value of f corresponding to a relationship between d and f when d is 5 meters. B1 B B f​​ 9. The near-field interference resistant microwave detection apparatus according to claim 6, wherein the near-field interference resistant microwave detection apparatus is further configured to filter out signals having a frequency less than f B1 from the Doppler intermediate frequency signals in a manner that simulates filtering to form signals having a frequency greater than or equal to f B . B1 ​ 10. The near-zone interference resistant microwave sounding device according to any one of claims 1 to 4 and 6 to 8, wherein f B ≥ f B1 the condition that the formation is made in the process of digital analysis of the Doppler intermediate frequency signal with the setting of f B1 as the minimum frequency threshold.

11. The microwave detection device resistant to near-field interference according to any one of claims 1 to 4 and 6 to 8, wherein f B ≥f B1 The condition is formed by using the corresponding function to analyze the frequency component f of the Doppler intermediate frequency signal in the frequency domain during the digital analysis of the Doppler intermediate frequency signal. B After conversion, f B1 The value formed by substituting it into this function is equivalent to the setting of the minimum threshold.

12. The near-zone interference resistant microwave sounding device according to any one of claims 1 to 9, wherein a far-zone expression is provided for a spatial range with a distance between the near-zone interference resistant microwave sounding device and a target object greater than Rmax, in a state where d takes Rmax, the near-zone interference resistant microwave sounding device is set to have an equivalent setting with a maximum distance threshold of Rmax based on a correspondence of Rmax to a corresponding frequency component f of the Doppler intermediate frequency signal. B2 B B2 f​​ 13. The near-zone interference resistant microwave probe of claim 12, wherein Rmax is greater than Rmin and the difference between the two is less than or equal to 3 meters.

14. The near-field interference resistant microwave detection apparatus of claim 13, wherein f B ≤ f B2 the condition of formation is made in the process of digital analysis of the Doppler intermediate frequency signal with the setting of f B2 as the maximum frequency threshold.

15. The near-field interference resistant microwave detection apparatus of claim 13, wherein f B ≤ f B2 the condition is formed in the process of digital analysis and processing of the Doppler intermediate frequency signal, after the frequency component f B of the Doppler intermediate frequency signal in the frequency domain is converted with a corresponding function, the value formed by substituting f B2 into the function is set as the maximum threshold equivalent.

16. The near-field interference resistant microwave detection apparatus of claim 13, wherein the near-field interference resistant microwave detection apparatus is further configured to filter out signals having a frequency greater than f B2 from the Doppler intermediate frequency signals in a manner that emulates filtering to form a condition that f B ≤ f B2 .

17. The near-zone interference resistant microwave probe of claim 13, wherein the value of Rmax is set to be less than or equal to the height of the near-zone interference resistant microwave probe above ground in a vertical probe application scenario.

18. The near-zone interference resistant microwave probe of claim 13, wherein the values of Rmin and Rmax are adjustably set.

19. The near-zone interference resistant microwave probe of claim 18, wherein the near-zone interference resistant microwave probe is configured to adjust the values of Rmin and Rmax in response to adjustment of a dial switch.

20. The near-zone interference resistant microwave probe of claim 18, wherein the near-zone interference resistant microwave probe is configured to adjust the values of Rmin and Rmax in response to graphical remote control adjustment.

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