Device for testing human body posture recognition microwave sensor

Abstract

A device for testing a human body posture recognition microwave sensor comprises a microwave sensor, a sensor fixing device, a camera module, a camera module fixing device and a computing control center connected with the microwave sensor, the sensor fixing device, the camera module and the camera module fixing device respectively. The calculation control center adjusts the information collection positions and angles of the microwave sensor and the camera module by controlling the sensor fixing device and the camera module fixing device, obtains the recognition result of the microwave sensor and the imaging data of the camera module, and calls a posture recognition algorithm to analyze the imaging data. Meanwhile, a distance measurement algorithm is called to calculate the distance between the attitude simulation object and the microwave sensor, finally, recognition data of the algorithm, recognition results of the microwave sensor and corresponding distance data are summarized, and a comparison report is generated; the device also wraps components generating electromagnetic interference through an electromagnetic interference shielding structure. According to the invention, the sensor detection requirement under the microwave anechoic chamber condition is met, and the automatic test of the human body posture recognition microwave sensor can be realized.

Description

Technical Field

[0001] The invention belongs to the field of microwave sensors, and in particular relates to a detection device of a microwave sensor. Background Art

[0002] The human posture recognition microwave sensor is a detection device. When a human body moves within the detection range of the microwave sensor, it will cause the reflection and scattering of the microwave signal. The microwave sensor detects and recognizes the human body movement by receiving and processing these reflected signals. The typical motion recognition functions of the existing human posture recognition microwave sensors include presence or absence detection, motion detection, human micro-motion detection, and static presence detection. Generally, the microwave sensor output results are compared with the actual situation to obtain the accuracy of the microwave sensor detection, so as to judge whether the performance of the microwave sensor meets the standard requirements.

[0003] At present, the main detection basis for microwave sensors for human posture recognition is GB / T44794-2024 "Technical requirements and evaluation methods for microwave sensing functions of household and similar electric automatic controllers". The standard does not provide a specific test device. In practice, the current tests mostly record the model's action type, action time and number of actions manually, and then compare them with the detection results of the microwave sensor to detect the accuracy of microwave sensor action recognition. During the test, the position, height and angle of the microwave sensor need to be adjusted manually and complicatedly many times, which leads to problems such as manual errors, low efficiency and high time cost.

[0004] Furthermore, the detection accuracy of microwave sensors will be affected by external electromagnetic interference. The GB / T44794-2024 standard clearly requires that such tests should be carried out in a microwave darkroom that meets the requirements. The existing detection devices do not have good electromagnetic shielding, which may cause abnormal test results. Summary of the invention

[0005] The object of the present invention is to provide a test device for a microwave sensor which can shield environmental electromagnetic interference and has a high degree of automation, so as to realize the automated test of a microwave sensor for human posture recognition.

[0006] The object of the present invention is achieved through the following technical solutions: a device for testing a microwave sensor for human posture recognition, comprising a microwave sensor and a sensor fixing device, a camera module and a camera module fixing device, and also comprising a computing control center connected to them respectively, wherein the computing control center adjusts the information collection position and angle of the microwave sensor and the camera module by controlling the sensor fixing device and the camera module fixing device respectively, obtains the recognition result of the microwave sensor and the imaging data of the camera module, calls a posture recognition algorithm to parse the imaging data, and calls a distance measurement algorithm to calculate the distance between a posture simulation object and the microwave sensor, finally summarizes the recognition data of the algorithm and the recognition result of the microwave sensor and the corresponding distance data, and generates a comparison report according to a template;

[0007] The device further comprises an electromagnetic interference shielding structure which encloses the components in the device that generate electromagnetic interference.

[0008] The above-mentioned posture recognition algorithm and ranging algorithm are existing algorithms. During use, pay attention to training them so that their recognition accuracy reaches the error range required by the experiment.

[0009] The present invention realizes the automated testing of the microwave sensor for human posture recognition by pre-installing the sensor and the camera module, comparing the recognition result of the mature image recognition technology with the recognition data of the sensor, and embedding the neural network and machine vision throughout the process, without manual intervention, making the device more intelligent. At the same time, the present invention uses an electromagnetic interference shielding structure to shield the interference source in the device, which can well meet the requirements of the standard GB / T 44794-2024.

[0010] The sensor fixing device comprises a top-mounted fixing rod and a first adjustable fixing platform, and the first adjustable fixing platform can be hoisted on the laboratory ceiling through the top-mounted fixing rod.

[0011] The top-mounted fixing rod is a telescopic rod so that the height of the sensor can be further adjusted.

[0012] The camera module fixing device includes a tracking track, a moving trolley and a second adjustable fixing platform. The tracking track surrounds the edge of the laboratory ceiling, and the second adjustable fixing platform is movably suspended on the laboratory ceiling by being connected to the moving trolley in the tracking track.

[0013] The adjustable fixed platforms 1 and 2 each include two control motors, one of which is installed behind the output shaft of the other and then connected to the microwave sensor or the camera module. One is a horizontal control motor and the other is a vertical control motor, which are used to drive the microwave sensor or the camera module to rotate along the vertical axis and the horizontal axis respectively.

[0014] Preferably, the camera module fixing device further comprises a telescopic rod, and the second adjustable fixing platform is connected to the moving trolley in the tracking track via the telescopic rod.

[0015] The electromagnetic interference shielding structure comprises an electromagnetic interference-free pipe, which is composed of a metal pipe or a pipe-shaped surrounding layer formed of a flexible metal material, and which wraps around the periphery of the circuit generating electromagnetic interference in the device.

[0016] The mobile trolley moves inside the track, and the second adjustable fixed platform is connected to the mobile trolley by extending into the track from the downward opening of the track through a connecting piece such as a telescopic rod. The tracking track is an electromagnetic shielding tracking track, which is made of metal material, and a piece of conductive cloth is connected to the track on both sides of the opening. The other sides of the two conductive cloths sag and are attracted together by magnetic strips. The connecting piece breaks through their attraction structure and passes through, and the connecting piece is tapered on both sides along the direction of the track so as to better separate the attracted magnetic strips when moving with the mobile trolley.

[0017] A power supply line and a communication line are laid inside the electromagnetic shielding tracking track, and a carbon brush is provided on the mobile vehicle, which is connected with the power supply line and the communication line through the carbon brush to provide power signals and control signals for the camera module fixing device.

[0018] The mobile car maintains its own balance through the PID algorithm to ensure that the camera module can stably obtain clear and accurate imaging data.

[0019] 1) The device of the present invention is more intelligent, does not require manual intervention, can realize the automated test of the human posture recognition microwave sensor, and can meet the requirements of the standard GB / T 44794-2024 for electromagnetic shielding;

[0020] 2) The electromagnetic shielding tracking track of the present invention can achieve electromagnetic shielding while not hindering the movement of the trolley;

[0021] 3) The present invention can realize high-efficiency testing of multiple categories of microwave sensors for human posture recognition, and is suitable for type testing by testing agencies and factory testing by manufacturers. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A top view of a schematic diagram of a system layout of an apparatus for testing a microwave sensor for human posture recognition according to a preferred embodiment of the present invention;

[0023] Figure 2 A front view of a schematic diagram of a system arrangement of an apparatus for testing a microwave sensor for human posture recognition according to a preferred embodiment of the present invention;

[0024] Figure 3 for Figure 1 , 2 A schematic diagram of the related structure of the first adjustable fixed platform;

[0025] Figure 4 for Figure 1 , 2 A schematic diagram of the relevant structure of the second adjustable fixed platform;

[0026] Figure 5 Schematic diagram of the structure of two optional solutions of the camera module fixing device of this embodiment;

[0027] Figure 6 It is a schematic diagram of the working relationship between the telescopic rod, the conductive cloth and the magnetic strip;

[0028] Figure 7 Schematic diagram of the shielding structure of the line.

[0029] Figure 8 It is a block diagram summarizing the overall structure of this embodiment. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with specific embodiments and the accompanying drawings.

[0031] The device for testing a microwave sensor for human posture recognition in this embodiment includes a microwave sensor and a sensor fixing device, a camera module and a camera module fixing device. Figure 1 , 2 As shown, the sensor fixing device includes a top-mounted fixing rod 1 and a first adjustable fixing platform 2, and the first adjustable fixing platform 2 is hoisted on the laboratory ceiling through the top-mounted fixing rod 1. The top-mounted fixing rod 1 is preferably a telescopic rod so that the height of the sensor can be adjusted. The camera module fixing device includes a tracking track 4, a moving trolley, a telescopic rod 5 and a second adjustable fixing platform 3. The tracking track surrounds 4 on the edge of the laboratory ceiling, and the second adjustable fixing platform 3 is connected to the moving trolley in the tracking track 4 through the telescopic rod 5 so as to be movably hoisted on the laboratory ceiling. The telescopic rod 5 is used to make the hanging height of the camera module further adjustable to obtain a better imaging angle.

[0032] Figure 3 Schematic diagram of the relevant structure of the first adjustable fixing platform 2, wherein a is a top view, b is a front view, c is a stereogram, and d is a right view. Figure 4 Schematic diagram of the relevant structure of the second adjustable fixed platform 3, where a is a front view, b is a top view, and c is a left view. Since the two adjustable fixed platforms have similar structures, the first adjustable fixed platform 2 is mainly introduced in detail below. Figure 3As shown, it includes a fixing plate 21, a horizontal control motor 22, a vertical control motor 23 and a sensor mounting plane 24. The top-mounted fixing rod 1 is connected to the fixing plate 21, the horizontal control motor 22 is installed on the lower surface of the fixing plate 21 with its rotating shaft vertically downward, and the vertical control motor 23 is connected to the rotating shaft of the horizontal control motor 22, and its rotating shaft is horizontally arranged and connected to the sensor mounting plane 24. The horizontal control motor 22 and the vertical control motor 23 are used to drive the microwave sensor installed on the sensor mounting plane 24 to rotate along the vertical axis and the horizontal axis respectively. Figure 4 31 is a horizontal control motor, 32 is a fixed connection layer, 33 is a vertical control motor, and 34 is a camera module installation plane. The driving method of the two motors for the camera module can be seen in Figure 3 .

[0033] Figure 5 Two optional solutions for the camera module fixing device of this embodiment are given, a is solution one, b is solution two, and the difference between the two solutions mainly lies in the power supply method of the mobile car 6 and whether to communicate with the control computer in real time. In solution one, the mobile car 6 uses a battery 7 to drive the wheels with a motor to rotate, and the camera module moves according to a predetermined program, including moving, extending, and rotating with the mobile car 6. In solution two, the power supply line 8 and the communication line 9 are directly connected to the track 4, such as Figure 5 As shown, the camera module fixing device is provided with a power signal and a control signal of the control computer by contacting the carbon brush 61 on the chassis 65 of the mobile trolley 6. The trolley can capture motion information at a predetermined angle and position according to a pre-set program, or it can be controlled in real time by the control computer through the communication circuit laid at the bottom of the track. The control computer can transmit the height, pitch angle and horizontal angle information of the sensor to the sensor fixing device via UART to automatically adjust it, and receive and process the judgment result or raw data sent by the sensor in real time. If it is raw data, the data frame processing program is performed to obtain the judgment result. 62 is a single-chip microcomputer and an angle sensor, which uses a PID algorithm to maintain the balance of the trolley 6 itself and the telescopic rod connected to it when it is stationary, moving, accelerating and decelerating, and turning, to ensure that the camera module can stably obtain clear and accurate image information. 63 is a motor, and 64 is a wheel, which is driven by motor 63. As shown Figure 5 As shown, the moving trolley 6 moves inside the track 4, and the second adjustable fixed platform 3 extends from the downward opening of the track 4 into the track 4 through the telescopic rod 10 (101 is the telescopic control motor of the telescopic rod 10) and is connected to the chassis 65 of the moving trolley 6. Since the electromagnetic interference generated by the second scheme is relatively large, in order to shield this electromagnetic interference, it adopts an electromagnetic shielding tracking track made of metal material. Figure 5As shown on the right, a conductive cloth 11 is connected to each track on both sides of the track 4 opening. The other sides of the two conductive cloths 11 hang down and are attracted together by the magnetic strip 12. The lifting rod 10 breaks through their attraction structure and passes through. The lifting rod 10 is tapered on both sides along the track 4 direction, as shown in FIG. Figure 6 As shown, in order to better separate the attracted magnetic strip 12 when moving with the mobile trolley 6.

[0034] In order to meet the requirements of standard GB / T 44794-2024 on electromagnetic shielding, the device of this embodiment also includes an electromagnetic interference shielding structure, which is used to wrap the components that generate electromagnetic interference in the device, such as using flexible metal materials to wrap the camera module. Figure 7 The shielding solution proposed by this embodiment for the line is given. Figure 7 As shown, the circuit is wrapped with a non-electromagnetic interference pipe, including a metal pipe 13 and a pipe-shaped surrounding layer 14 formed of a flexible metal material, which is selected according to the use scenario of the circuit 15 that generates electromagnetic interference. The circuit 15 here includes a power circuit and a signal circuit.

[0035] This embodiment also includes a computing control center, which is mainly used to control the information collection position and angle of the microwave sensor and the camera module, obtain the recognition result of the microwave sensor and the imaging data of the camera module, call the posture recognition algorithm to parse the imaging data, and call the distance measurement algorithm to calculate the distance between the posture simulation object and the microwave sensor. Finally, the recognition data of the algorithm and the recognition result of the microwave sensor and the corresponding distance data are summarized, and a comparison report is generated according to the template for reference by the inspection engineer.

[0036] The camera module obtains the model's movement information captured at different positions on the track, marks the position information and sends it to the computing control center. After receiving the image information with the position mark, the computing control center pre-processes it, screens the image information with high recognition, and uses the YOLOV5 algorithm model to identify the action to obtain the judgment result. At the same time, the camera ranging algorithm is used to calculate the angle and distance of the model relative to the sensor when the action occurs. The control center integrates the results of the YOLOV5 algorithm and the camera ranging algorithm, and compares them with the processed sensor judgment data to obtain the recognition accuracy of the sensor to be tested at different distances, angles, and ranges, and automatically generates a report format based on the judgment results such as position, angle, distance, action type, and number of actions, which greatly simplifies the workload of engineers.

[0037] The computing control center of this embodiment can be an integrated type or a distributed type. The distributed type can be a solution that uses a control computer and a single-chip microcomputer development board to realize the control of part of the structure.

[0038] The camera module of this embodiment includes an infrared camera, a photosensitive sensor and a high-definition camera. The motor in this embodiment is steplessly adjustable.

[0039] Figure 8 This is a summary of the overall structural block diagram of this embodiment, which reflects the camera module and sensor installation method, shielding measures, and the main functions of the computer controlled by the computing control center. In terms of effect, this embodiment realizes the automated test of the human posture recognition microwave sensor, effectively improving the test efficiency of this type of sensor. The entire test process does not require manual intervention, which reduces labor costs and is conducive to improving test efficiency.

Claims

1. A device for testing a microwave sensor for human posture recognition, characterized in that: It includes a microwave sensor and a sensor fixing device, a camera module and a camera module fixing device, and also includes a computing control center connected to them respectively. The computing control center adjusts the information collection position and angle of the microwave sensor and the camera module by controlling the sensor fixing device and the camera module fixing device respectively, obtains the recognition result of the microwave sensor and the imaging data of the camera module, and calls the posture recognition algorithm to analyze the imaging data, and calls the distance measurement algorithm to calculate the distance between the posture simulation object and the microwave sensor, and finally summarizes the recognition data of the algorithm and the recognition result of the microwave sensor and the corresponding distance data, and generates a comparison report according to the template; The device further comprises an electromagnetic interference shielding structure which encloses the components in the device that generate electromagnetic interference.

2. The device according to claim 1, characterized in that The sensor fixing device comprises a top-mounted fixing rod and a first adjustable fixing platform, and the first adjustable fixing platform can be hoisted on the laboratory ceiling through the top-mounted fixing rod.

3. The device according to claim 2, characterized in that The top-mounted fixing rod is a lifting and retracting rod.

4. The device according to claim 3, characterized in that The camera module fixing device includes a tracking track, a moving trolley and a second adjustable fixing platform. The tracking track surrounds the edge of the laboratory ceiling, and the second adjustable fixing platform is movably suspended on the laboratory ceiling by being connected to the moving trolley in the tracking track.

5. The device according to claim 4, characterized in that The adjustable fixed platforms 1 and 2 each include two control motors, one of which is installed behind the output shaft of the other and then connected to the microwave sensor or the camera module. One is a horizontal control motor and the other is a vertical control motor, which are used to drive the microwave sensor or the camera module to rotate along the vertical axis and the horizontal axis respectively.

6. The device according to claim 5, characterized in that The camera module fixing device also includes a telescopic rod, and the second adjustable fixing platform is connected to the moving trolley in the tracking track through the telescopic rod.

7. The device according to claim 1, characterized in that The electromagnetic interference shielding structure comprises an electromagnetic interference-free pipe, which is composed of a metal pipe or a pipe-shaped surrounding layer formed of a flexible metal material, and which wraps around the periphery of the circuit generating electromagnetic interference in the device.

8. The device according to claim 6, characterized in that The mobile trolley moves inside the track, and the second adjustable fixed platform is connected to the mobile trolley by extending into the track from the downward opening of the track through a connecting piece such as a telescopic rod. The tracking track is an electromagnetic shielding tracking track, which is made of metal material, and a piece of conductive cloth is connected to the track on both sides of the opening. The other sides of the two conductive cloths sag and are attracted together by magnetic strips. The connecting piece breaks through their attraction structure and passes through, and the connecting piece is tapered on both sides along the direction of the track so as to better separate the attracted magnetic strips when moving with the mobile trolley.

9. The device according to claim 8, characterized in that A power supply line and a communication line are laid inside the electromagnetic shielding tracking track, and a carbon brush is provided on the mobile vehicle, which is connected with the power supply line and the communication line through the carbon brush to provide power signals and control signals for the camera module fixing device.

10. The device according to claim 9, characterized in that The mobile car maintains its own balance through the PID algorithm to ensure that the camera module stably obtains clear and accurate imaging data.

Images