Vehicle-mounted radar waveguide antenna testing device and method

Abstract

The invention provides a vehicle-mounted radar waveguide antenna testing device and method. The vehicle-mounted radar waveguide antenna testing device comprises a testing camera obscura and a waveguide antenna testing assembly. The waveguide antenna test assembly comprises an antenna test bench and an antenna positioning test piece. The waveguide antenna test assembly further comprises at least two first test angle inverters and at least two second test angle inverters, the at least two first test angle inverters are distributed on the first test plane, the horizontal angles of the at least two first test angle inverters are opposite, and the horizontal angles of the at least two second test angle inverters are distributed on the second test plane. And the vertical angles of the at least two second test angles are opposite. By adjusting the alignment relationship between the test end of the antenna positioning test piece and each test end of the waveguide antenna to be tested, the signals of all the test ends of the waveguide antenna to be tested can be quickly acquired, each antenna performance parameter of the waveguide antenna to be tested can be effectively improved, the antenna test efficiency is effectively improved, the test is simple, and the test cost is low. And the antenna test cost is reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of waveguide antennas, and particularly to a test device and method for a vehicle-mounted radar waveguide antenna. Background Art

[0002] Currently, in the field of vehicle-mounted 4D millimeter-wave radar systems, the radar systems mainly use PCB antennas. Specifically, there are mainly two forms: series-fed microstrip antennas and substrate integrated waveguide slot antennas. With the new generation of vehicle-mounted 4D radar systems, the antenna form is gradually changing from PCB antennas to waveguide antennas. It can be foreseen that in the field of vehicle-mounted radar systems, waveguide antennas are gradually becoming the future mainstream antenna trend and are thus extended to other communication fields.

[0003] At present, there are relatively mature radar whole-machine test schemes for the test of vehicle-mounted millimeter-wave radars. However, for the test method and test system of the waveguide antenna, which is a key component of vehicle-mounted radars, no mature test scheme has been seen yet. The PCB microstrip antennas used in traditional radars belong to the printed circuit board process, with mature technology, high stability, and good performance consistency in mass production. Different from waveguide antennas, the latter has large manufacturing tolerances, and the process links involved may include injection molding, CNC machining, surface metallization, assembly welding, and other multi-step processes. Generally speaking, waveguide antennas belong to the category of structural part processing. Therefore, the final finished product has large uncertainties in manufacturing tolerances and performance consistency, and rigorous actual performance tests are required to ensure that the performance of the radar whole machine meets the standards after assembly.

[0004] Testing the S-parameters and radiation patterns of radar waveguide antennas in the prior art requires building a far-field anechoic chamber, setting up a test turntable, placing the antenna under test and the standard horn antenna at both ends of the anechoic chamber, and rotating the turntable to scan the spatial angle to obtain the radiation pattern and gain of the antenna. If angle target testing is required, a corner reflector is placed at a fixed position. This test scheme is suitable for R & D testing in the sample stage. Although accurate, it has cumbersome procedures, requires disassembling and assembling the antenna, repeated calibration and alignment, and the test cost is too high, which is not suitable for mass production and large-scale testing. Moreover, it usually takes at least one hour to half a day to test one antenna in the existing laboratory environment, and the test efficiency is low. Summary of the Invention

[0005] The purpose of the present disclosure is to overcome the deficiencies in the prior art and provide a test device and method for a vehicle-mounted radar waveguide antenna that can effectively improve the antenna test efficiency and reduce the antenna test cost.

[0006] The purpose of the present disclosure is achieved through the following technical solutions:

[0007] A vehicle-mounted radar waveguide antenna test device includes: a test anechoic chamber and a waveguide antenna test component; the waveguide antenna test component is arranged in the test anechoic chamber, and the waveguide antenna test component includes an antenna test bench and an antenna position adjustment test piece. The antenna test bench is used to place the waveguide antenna to be tested, and the antenna test bench is connected to the inner wall of the test anechoic chamber. The antenna test bench is arranged opposite to the antenna position adjustment test piece, and the test end of the antenna position adjustment test piece is used to be connected to each test end of the waveguide antenna to be tested in batches; the waveguide antenna test component further includes at least two first corner reflectors and at least two second corner reflectors. At least two of the first corner reflectors are distributed in a first test plane, and the horizontal angles of at least two of the first corner reflectors are opposite. At least two of the second corner reflectors are distributed in a second test plane, and the vertical angles of at least two of the second corner reflectors are opposite. Among them, both the first test plane and the second test plane are perpendicular to the antenna test bench, and an included angle is formed between the first test plane and the second test plane.

[0008] In one embodiment, the first test plane and the second test plane are perpendicular to each other.

[0009] In one embodiment, the distances between at least two of the first corner reflectors and the antenna test bench are different from each other.

[0010] In one embodiment, the distances between at least two of the second corner reflectors and the antenna test bench are different from each other.

[0011] In one embodiment, the waveguide antenna test component further includes a top corner reflector. The top corner reflector is located on the first test plane, and the distance between the top corner reflector and the antenna test bench is greater than the distances between each of the first corner reflectors and the antenna test bench.

[0012] In one embodiment, the top corner reflector and all the first corner reflectors are distributed in an arc with the antenna test bench as the center of the arc.

[0013] In one embodiment, the antenna position adjustment test piece includes a multi-axis position adjuster and an antenna tester. The test end of the antenna tester faces the waveguide antenna to be tested on the antenna test bench. The antenna tester is arranged on the multi-axis position adjuster, and the multi-axis position adjuster is used to adjust the distance between the test end of the antenna tester and the waveguide antenna to be tested on the antenna test bench.

[0014] In one embodiment, the antenna position adjustment test piece further includes a uniaxial mover, the uniaxial mover is connected to the multi-axis position adjuster, the moving end of the uniaxial mover is connected to the test end of the antenna tester, and the uniaxial mover is used to adjust the relative position between the test end of the antenna tester and the corner reflector test end of the waveguide antenna under test.

[0015] In one embodiment, the test anechoic chamber includes a box body and an inner wall absorbing layer, and the inner wall absorbing layer covers the inner wall of the box body.

[0016] A method for testing a vehicle-mounted radar waveguide antenna, the method includes:

[0017] Place the waveguide antenna under test on the antenna test bench;

[0018] Start the signal transceiver function of the waveguide antenna under test, and sample the corner reflector signal at the test end of the waveguide antenna under test;

[0019] Drive the test end of the antenna position adjustment test piece to move, so as to sample the corner reflector signals corresponding to the remaining test ends of the waveguide antenna under test in batches.

[0020] Compared with the prior art, the present disclosure has at least the following advantages:

[0021] During the test of the waveguide antenna under test, the signal emitted by the waveguide antenna under test is reflected in multiple directions and at multiple angles through the first test corner reflector and the second test corner reflector. The antenna position adjustment test piece samples the signals sent and returned by the waveguide antenna under test, and only by adjusting the alignment relationship between the test end of the antenna position adjustment test piece and each test end of the waveguide antenna under test, it is convenient to quickly collect the signals of all test ends of the waveguide antenna under test, so that the various antenna performance parameters of the waveguide antenna under test are effectively improved, the antenna test efficiency is improved, and moreover, the test is simple and the antenna test cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present disclosure, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is a schematic diagram of a vehicle-mounted radar waveguide antenna test device in one embodiment;

[0024] Figure 2 is Figure 1 A schematic diagram of another perspective of the vehicle-mounted radar waveguide antenna test device shown;

[0025] Figure 3 As Figure 1 a schematic diagram of another perspective of the in-vehicle radar waveguide antenna test device shown;

[0026] Figure 4 a schematic diagram of the antenna position adjustment test piece in an embodiment;

[0027] Figure 5 a flowchart of the in-vehicle radar waveguide antenna test method in an embodiment;

[0028] Figure 6 an angular reflection time-domain test chart at 0.9 m and 1 m from the waveguide antenna to be measured;

[0029] Figure 7 As Figure 6 the corresponding time-domain filtering chart;

[0030] Figure 8 an angular reflection time-domain filtering chart at 1 m from the waveguide antenna to be measured;

[0031] Figure 9 a frequency-domain chart after angular reflection filtering and conversion at 0.9 m from the waveguide antenna to be measured;

[0032] Figure 10 a frequency-domain chart after angular reflection filtering and conversion at 1 m from the waveguide antenna to be measured;

[0033] Figure 11 a frequency-domain test chart in 9 angular reflection environments;

[0034] Figure 12 a time-domain test chart in 9 angular reflection environments;

[0035] Figure 13 a result chart after 9 angular reflection time-domain filtering;

[0036] Figure 14 a result chart after transformation to the frequency domain after 9 angular reflection time-domain filtering;

[0037] Figure 15 an S11 test chart with a horizontal angle of -60° angular reflection;

[0038] Figure 16 an S11 test chart with a horizontal angle of -45° angular reflection;

[0039] Figure 17 an S11 test chart with a horizontal angle of -30° angular reflection;

[0040] Figure 18 an S11 test chart with a horizontal angle of 60° angular reflection;

[0041] Figure 19 an S11 test chart with a horizontal angle of 45° angular reflection;

[0042] Figure 20 S11 test chart for a horizontal angle of 30° in the reverse direction;

[0043] Figure 21 S11 test chart for a horizontal angle of 0° in the reverse direction;

[0044] Figure 22 S11 test chart for a vertical angle of 6° in the reverse direction;

[0045] Figure 23 S11 test chart for a vertical angle of -6° in the reverse direction;

[0046] Figure 24 Pattern for all angles in the reverse direction at 77 GHz frequency point. Detailed implementation manner

[0047] To facilitate the understanding of the present disclosure, the present disclosure will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided so that the disclosure of the present disclosure can be understood more thoroughly and comprehensively.

[0048] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present disclosure belongs. The terms used in the specification of the present disclosure herein are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0050] The present disclosure relates to a vehicle-mounted radar waveguide antenna testing device. In one embodiment, the vehicle-mounted radar waveguide antenna testing device includes a test dark box and a waveguide antenna testing component; the waveguide antenna testing component is disposed inside the test dark box, and the waveguide antenna testing component includes an antenna test bench and an antenna position adjustment test piece. The antenna test bench is used for placing the waveguide antenna to be tested, the antenna test bench is connected to the inner wall of the test dark box, the antenna test bench is disposed opposite to the antenna position adjustment test piece, and the test end of the antenna position adjustment test piece is used for connecting to each test end of the waveguide antenna to be tested in batches; the waveguide antenna testing component further includes at least two first corner reflectors and at least two second corner reflectors. At least two of the first corner reflectors are distributed in a first test plane, and the horizontal angles of at least two of the first corner reflectors are opposite. At least two of the second corner reflectors are distributed in a second test plane, and the vertical angles of at least two of the second corner reflectors are opposite. Wherein, the first test plane and the second test plane are both perpendicular to the antenna test bench, and an included angle is formed between the first test plane and the second test plane. When testing the waveguide antenna to be tested, the signal emitted by the waveguide antenna to be tested is reflected in multiple directions and at multiple angles by the first corner reflector and the second corner reflector. The antenna position adjustment test piece samples the signals sent and returned by the waveguide antenna to be tested, and only by adjusting the alignment relationship between the test end of the antenna position adjustment test piece and each test end of the waveguide antenna to be tested, it is convenient to quickly collect the signals of all test ends of the waveguide antenna to be tested, so that various antenna performance parameters of the waveguide antenna to be tested are effectively improved, the antenna test efficiency is improved, and moreover, the test is simple and the antenna test cost is reduced.

[0051] Please refer to Figure 1 , which is a schematic structural diagram of a vehicle-mounted radar waveguide antenna testing device according to an embodiment of the present disclosure.

[0052] A vehicle-mounted radar waveguide antenna testing device 10 according to an embodiment includes a test dark box 100 and a waveguide antenna testing component 200. The waveguide antenna testing component 200 is disposed inside the test dark box 100. The waveguide antenna testing component 200 includes an antenna test bench 210 and an antenna position adjustment test piece 220. The antenna test bench 210 is used for placing the waveguide antenna to be tested. The antenna test bench 210 is connected to the inner wall of the test dark box 100. The antenna test bench 210 is disposed opposite to the antenna position adjustment test piece 220. The test end of the antenna position adjustment test piece 220 is used for connecting to each test end of the waveguide antenna to be tested in batches. Please refer to Figure 2 and 3, the waveguide antenna test assembly 200 further includes at least two first test corner reflectors 230 and at least two second test corner reflectors 240. At least two of the first test corner reflectors 230 are distributed in a first test plane, and the horizontal angles of at least two of the first test corner reflectors 230 are opposite. At least two of the second test corner reflectors 240 are distributed in a second test plane, and the vertical angles of at least two of the second test corner reflectors 240 are opposite. Wherein, both the first test plane and the second test plane are perpendicular to the antenna test bench 210, and an included angle is formed between the first test plane and the second test plane.

[0053] In this embodiment, during the test of the waveguide antenna to be measured, the signal emitted by the waveguide antenna to be measured is reflected in multiple directions and at multiple angles by the first test corner reflector 230 and the second test corner reflector 240. The antenna position adjustment test piece 220 samples the signals transmitted and returned by the waveguide antenna to be measured, and only by adjusting the alignment relationship between the test end of the antenna position adjustment test piece 220 and each test end of the waveguide antenna to be measured, it is convenient to quickly collect the signals of all test ends of the waveguide antenna to be measured, so that various antenna performance parameters of the waveguide antenna to be measured are obtained, effectively improving the antenna test efficiency. Moreover, the test is simple, reducing the antenna test cost.

[0054] In one of the embodiments, please refer to Figure 2 and 3 , the first test plane and the second test plane are perpendicular to each other. In this embodiment, the first test plane is the distribution plane of each of the first test corner reflectors 230. Specifically, the first test corner reflector 230 is connected to the inner wall of the test dark box 100, and the distribution plane formed by the distribution positions of all the first test corner reflectors 230 in the test dark box 100 forms the first test plane. The second test plane is the distribution plane of each of the second test corner reflectors 240. Specifically, the second test corner reflector 240 is connected to the inner wall of the test dark box 100, and the distribution plane formed by the distribution positions of all the second test corner reflectors 240 in the test dark box 100 forms the second test plane. The first test plane and the second test plane are two different distribution planes, so that the positions of the first test corner reflector 230 and the second test corner reflector 240 in the test dark box 100 are different, facilitating a more comprehensive test of the performance of the waveguide antenna to be measured. Among them, the first test plane and the second test plane are perpendicular to each other, that is, the angle of the included angle between the first test plane and the second test plane is 90 degrees. Specifically, the waveguide antenna to be measured is located in the X plane, the first test plane is located in the Y plane, and the second test plane is located in the Z plane, so as to sample the test of the antenna signal distribution of the waveguide antenna to be measured in two perpendicular directions, thereby improving the accuracy of the performance test of the waveguide antenna to be measured.

[0055] In another embodiment, both the first test plane and the second test plane are located on the side of the waveguide antenna under test away from the antenna test bench 210, that is, both the first test plane and the second test plane are located above the antenna test bench 210, so that the antenna signal transmission direction of the waveguide antenna under test faces the first test angle reflector 230 and the second test angle reflector 240.

[0056] In one embodiment, please refer to Figure 2 , at least two of the first test angle reflectors 230 are at different distances from the antenna test bench 210. In this embodiment, the first test angle reflector 230 is located in the first test plane, and the first test angle reflector 230 reflects the signal emitted by the waveguide antenna under test in the first test plane, so as to facilitate the acquisition of the reflected signal received by the waveguide antenna under test. The number of the first test angle reflectors 230 is multiple, and moreover, the heights of the first test angle reflectors 230 from the antenna test bench 210 are different, so that the waveguide antenna under test receives the signals reflected by the angle reflectors at different height positions, thereby testing the signals reflected from different angles to improve the test accuracy of the waveguide antenna under test.

[0057] In another embodiment, the waveguide antenna under test is placed in the middle of the antenna test bench 210, and a plurality of first test angle reflectors 230 are distributed above the waveguide antenna under test. Taking the waveguide antenna under test as the reference point, 6 first test angle reflectors 230 are horizontally arranged above the waveguide antenna under test, that is, 6 first test angle reflectors 230 are symmetrically distributed on the first test plane, but there is a height difference between the two symmetric first test angle reflectors 230. Specifically, the horizontal angles of the 6 first test angle reflectors 230 are ±60°, ±45°, ±30° respectively, and the corresponding layout coordinates are (R, theta, phi): (0.9m, -60°, 0°), (1.0m, 60°, 0°), (1.1m, -45°, 0°), (1.2m, 45°, 0°), (1.3m, -30°, 0°), (1.4m, 30°, 0°), where R is the distance between the first test angle reflector 230 and the waveguide antenna under test, theta is the horizontal angle of the first test angle reflector 230 on the first test plane, and phi is the vertical angle of the second test angle reflector 240 on the second test plane. The first test angle reflector 230 is a 77GHz angle reflector with an RCS of 5dBsm.

[0058] In one embodiment, please refer to Figure 3, at least two of the second test corner reflectors 240 are at different distances from the antenna test bench 210. In this embodiment, the second test corner reflectors 240 are located in the second test plane, and the second test corner reflectors 240 reflect the signals emitted by the waveguide antenna under test in the second test plane, so as to facilitate the acquisition of the reflected signals received by the waveguide antenna under test. The number of the second test corner reflectors 240 is multiple, and moreover, the heights of the second test corner reflectors 240 from the antenna test bench 210 are different, so that the waveguide antenna under test receives the signals reflected by the corner reflectors at different height positions, thereby testing the signals reflected at different angles to improve the test accuracy of the waveguide antenna under test.

[0059] In another embodiment, the waveguide antenna under test is placed in the middle of the antenna test bench 210, and two second test corner reflectors 240 are distributed above the waveguide antenna under test. Taking the waveguide antenna under test as a reference point, there are 2 second test corner reflectors 240 vertically above the waveguide antenna under test in the horizontal layout, that is, 2 second test corner reflectors 240 are symmetrically distributed on the second test plane. However, there is a height difference between the two symmetric second test corner reflectors 240. Specifically, the horizontal angles of the 2 second test corner reflectors 240 are ±6° respectively, and the corresponding layout coordinates are (R, theta, phi): (1.5m, 0°, -6°), (1.6m, 0°, 6°), where R is the distance between the first test corner reflector 230 and the waveguide antenna under test, theta is the horizontal angle of the first test corner reflector 230 on the first test plane, and phi is the vertical angle of the second test corner reflector 240 on the second test plane. The second test corner reflector 240 is a 77GHz corner reflector with an RCS = 5dBsm.

[0060] In one of the embodiments, please refer to Figure 2 and 3 , the waveguide antenna test assembly 200 further includes a top test corner reflector 250. The top test corner reflector 250 is located on the first test plane, and the distance between the top test corner reflector 250 and the antenna test bench 210 is greater than the distances between the first test corner reflectors 230 and the antenna test bench 210. In this embodiment, the top test corner reflector 250 serves as a corner reflector at a special position on the first test plane. The top test corner reflector 250 and the first test corner reflectors 230 jointly form a corner reflector structure on the first test plane, which is convenient for determining the signal reflection conditions at various heights and angles on the first test plane. The top test corner reflector 250 is the corner reflector with the highest position in the corner reflector structure on the first test plane. Specifically, the top test corner reflector 250 is the corner reflector that is vertically opposite to the antenna test bench 210 and has the largest height on the first test plane.

[0061] Further, the top test angle reflector 250 and all the first test angle reflectors 230 are distributed in an arc with the antenna test bench 210 as the center of the arc. In this embodiment, the top test angle reflector 250 and the first test angle reflectors 230 are jointly distributed on the first test plane. The top test angle reflector 250 and the multiple first test angle reflectors 230 form an arc-shaped distribution structure. Specifically, the top test angle reflector 250 and the multiple first test angle reflectors 230 are distributed along a semi-circular arc. The top test angle reflector 250 is located at the vertex of the semi-circular arc. The multiple first test angle reflectors 230 are symmetrically distributed at an angle, that is, with the line connecting the top test angle reflector 250 and the waveguide antenna under test as the midline, the first test angle reflectors 230 are symmetrically distributed on the left and right. And the symmetric first test angle reflectors 230 only have the same angle but different heights. The top test angle reflector 250 is the angle reflector on the first test plane that is farthest from the waveguide antenna under test, and the top test angle reflector 250 faces the antenna test bench 210 directly, making the angle reflector test position of the waveguide antenna under test more comprehensive during the antenna performance test, and further improving the formation test accuracy of the waveguide antenna under test.

[0062] In another embodiment, the waveguide antenna under test is placed in the middle of the antenna test bench 210. One top test angle reflector 250 is arranged above the waveguide antenna under test. With the waveguide antenna under test as the reference point, one top test angle reflector 250 is horizontally arranged above the waveguide antenna under test, that is, one top test angle reflector 250 is arranged on the first test plane. However, the top test angle reflector 250 is larger in height than both the first test angle reflector 230 and the second test angle reflector 240. Specifically, the horizontal angles of the top test angle reflector 250 are 0° respectively, and the corresponding layout coordinates are (R, theta, phi): (1.7m, 0°, 0°), where R is the distance between the top test angle reflector 250 and the waveguide antenna under test, theta is the horizontal angle of the top test angle reflector 250 on the first test plane, and phi is the vertical angle of the top test angle reflector 250 on the second test plane. The top test angle reflector 250 uses a 77GHz angle reflector, and RCS = 5dBsm.

[0063] In one of the embodiments, please refer to Figure 4, the antenna position adjustment test piece 220 includes a multi-axis position adjuster 222 and an antenna tester 224. The test end of the antenna tester 224 faces the waveguide antenna to be tested on the antenna test bench 210. The antenna tester 224 is disposed on the multi-axis position adjuster 222, and the multi-axis position adjuster 222 is used to adjust the distance between the test end of the antenna tester 224 and the waveguide antenna to be tested on the antenna test bench 210. In this embodiment, the multi-axis position adjuster 222 is located at the bottom of the test dark box 100. The multi-axis position adjuster 222 serves as the moving mechanism of the antenna tester 224, and the multi-axis position adjuster 222 adjusts the position of the antenna tester 224 in multiple axial directions so that the test end of the antenna tester 224 is aligned with each test end of the waveguide antenna to be tested. The antenna tester 224 serves as the antenna performance test mechanism for the waveguide antenna to be tested. Specifically, the antenna tester 224 includes a network analyzer and a spread spectrum module, which are convenient for determining the S11 and S21 parameters and radiation pattern of the waveguide antenna to be tested, thereby facilitating the judgment of whether the antenna is qualified.

[0064] Further, the antenna position adjustment test piece 220 further includes a single-axis mover 226. The single-axis mover 226 is connected to the multi-axis position adjuster 222. The moving end of the single-axis mover 226 is connected to the test end of the antenna tester 224. The single-axis mover 226 is used to adjust the relative position between the test end of the antenna tester 224 and the corner reflector test end of the waveguide antenna to be tested. In this embodiment, the single-axis mover 226 is installed on the multi-axis position adjuster 222. The single-axis mover 226 serves as the fine adjustment mechanism of the antenna tester 224. After the antenna tester 224 moves to the corresponding position of the waveguide antenna to be tested, the single-axis mover 226 finely adjusts the relative position between the test end of the antenna tester 224 and the corner reflector test end of the waveguide antenna to be tested, so that the test end of the antenna tester 224 changes positions among multiple corner reflector test ends, which is convenient for quickly collecting signals from each corner reflector test end of the waveguide antenna to be tested.

[0065] In another embodiment, please refer to Figure 4, the multi-axis positioner 222 includes a first bracket 2222, a first slide rail 2224, a second bracket 2226, a second slide rail 2228, a third bracket 2221 and a third slide rail 2223. The first bracket 2222 is disposed at the bottom of the test dark box 100. The first slide rail 2224 is connected to the first bracket 2222. The second bracket 2226 is slidably disposed on the first slide rail 2224. The second slide rail 2228 is connected to the second bracket 2226. The third bracket 2221 is slidably disposed on the second slide rail 2228. The third slide rail 2223 is connected to the third bracket 2221. The antenna tester 224 is slidably disposed on the third slide rail 2223. The first slide rail 2224, the second slide rail 2228 and the third slide rail 2223 are perpendicular to each other in pairs. In this way, the antenna tester 224 can move in three different directions along the first slide rail 2224, the second slide rail 2228 and the third slide rail 2223, so that the test end of the antenna tester 224 is accurately positioned and aligned with each test end of the waveguide antenna to be tested.

[0066] In another embodiment, the single-axis mover 226 is slidably disposed on the third slide rail 2223. The moving end of the single-axis mover 226 is connected to the test end of the antenna tester 224 to push the test end of the antenna tester 224 to move between the corner reflector test ends of the waveguide antenna to be tested, so as to improve the test sampling rate of the corner reflector test ends of the waveguide antenna to be tested. Specifically, the waveguide antenna to be tested is an 8T8R radar antenna. The antenna tester 224 tests 2 ports simultaneously each time and takes 3 seconds, with a total time of 12 seconds.

[0067] In one embodiment, the test dark box includes a box body and an inner wall absorbing layer. The inner wall absorbing layer covers the inner wall of the box body. In this embodiment, the inner wall absorbing layer covers the entire inner wall of the box body, so that a complete dark room environment is formed inside the test dark box, which is convenient for absorbing the signals of the waveguide antenna to be tested at positions other than the corner reflector and avoiding the reflection interference of the test signals at positions other than the corner reflector, thereby improving the test accuracy of the waveguide antenna to be tested.

[0068] In one embodiment, the present disclosure also relates to a method for testing a vehicle-mounted radar waveguide antenna. Please refer to Figure 5 , the method includes:

[0069] S100: Place the waveguide antenna to be tested on the antenna test bench.

[0070] S200: Start the signal transceiver function of the waveguide antenna to be tested and sample the corner reflector signals of the test ends of the waveguide antenna to be tested.

[0071] S300: Move the test end of the driving antenna position adjustment test piece to sample the corner reflector signals corresponding to the remaining test ends of the waveguide antenna to be measured in batches.

[0072] The test method for the vehicle-mounted radar waveguide antenna is implemented by using the test device for the vehicle-mounted radar waveguide antenna described in any of the above embodiments.

[0073] In another embodiment, the specific test process of the test method for the vehicle-mounted radar waveguide antenna is as follows:

[0074] Taking two first test corner reflectors 230 respectively arranged at positions 0.9 m and 1 m away from the waveguide antenna to be measured as an example,

[0075] 1. During the test, convert the frequency-domain test of the network analyzer to the time-domain test mode as follows Figure 6 For the result of the time-domain test of a certain port, it can be seen that there are two main peaks. Peak 1 is at 5.976 ns, with a distance of 895.78 mm, and peak 2 is at 6.768 ns, with a distance of 1.01 m. The test result is very close to the actual position where the corner reflectors are placed. Therefore, these two main peaks in the time domain are the reflection S11 targets of the actual corner reflectors.

[0076] 2. As Figure 7 shown, based on this, perform time-domain gating filtering on these two corner reflector peaks respectively, that is, remove other stray signals in the time domain and only leave these two peaks. Figure 6 This is the case where only the corner reflector at 1 m is retained. Figure 8

[0077] 3. As Figure 9 10 shown, perform an inverse transform on the time-domain filtered signal to the frequency domain to obtain the final frequency-domain curve. At this time, the frequency-domain S11 curve represents the reflection situation under the condition of only one corner reflector target.

[0078] Figure 11 Figure 12 In another embodiment, the test situation in a 9-corner reflector environment, that is, 6 first test corner reflectors 230, 2 second test corner reflectors 240, and 1 top test corner reflector 250. Figure 11 This is the original frequency-domain test result of the 9 corner reflectors in the real situation. Figure 12 This is the result of converting the frequency domain to the time domain by performing an inverse chirp Z-transform (ICZT) based on Figure 11 this. It can be seen that Figure 12 after the marked point 3 on this, there are 9 consecutive peaks, which correspond to 9 corner reflectors. Because the distances of the 9 corner reflectors increase by 0.1 m in sequence, the peaks of the corner reflectors have corresponding delays in time, and these 9 corner reflectors can be clearly distinguished on the time-domain test curve.

[0079] Step 1. In Figure 12Based on this, mark the points of each peak, and then perform time-domain filtering, which will produce a result similar to Figure 8 the time-domain filtering result of a single corner reflector. Then, transform it to the frequency domain to obtain Figure 10 the frequency-domain result of, which gives the frequency-domain amplitude S11 of this corner reflector. This result is used to judge the amplitude consistency of the angle target, as well as to calculate the gain and plot the radiation pattern. The time-domain and frequency-domain diagrams of the 9 peaks will not be elaborated separately. The processing steps are the same as those of the 2 corner reflectors.

[0080] Step 2: As Figure 13 shown, filter these 9 corner reflectors simultaneously, and all the peaks are suppressed. Apply Figure 13 the filtered time-domain waveform to perform a chirp Z-transform (CZT) to the frequency domain to obtain the final filtered frequency-domain data, as Figure 14 . Comparing Figure 11 and Figure 14 , it can be seen that Figure 14 the curve is smoother, without clutter and fluctuations. This is the result after filtering out the corner reflectors. Therefore, Figure 14 represents the S11 situation of the device under test itself.

[0081] Therefore, for the above two steps, step 1 solves the test of the radiation pattern gain at a specific angle in space, and step 2 solves the S-parameter test of the antenna itself. Therefore, in this set of steps, the measurement of circuit parameters and radiation parameters is completed simultaneously. Compared with the existing test methods where circuit parameters and radiation parameters are measured separately, the efficiency is greatly improved. When mass-producing, it can test the S-parameters of the antenna by 100% and the radiation pattern gain by 100% at the same time, while ensuring efficient testing. It takes 12 seconds to complete the test of one antenna, without spending hours or even half a day.

[0082] In another embodiment, perform a repeatability test on this system. For the convenience of observation, randomly select the test results of 5 verified qualified waveguide antennas under test that have been installed in the radar. As follows Figures 15 to 23 , corresponding to the situation of 9 corner reflectors. It can be seen that within the entire test frequency band of 76 - 81 GHz, for the test data of each sub-graph of the corner reflector, the 5 products have good consistency. If there are serious deviations, it indicates that there is a problem with the waveguide antenna under test, and defective products can be picked out.

[0083] Based on Figures 15 to 23 , obtain the radiation pattern data of the waveguide antenna under test. That is, extract the data of the 9 corner reflectors at the same frequency point and plot them into a graph. As Figure 24 shown, it is the radiation pattern at the 77 GHz frequency point, and other frequency points are similar. They will not be shown again.

[0084] Obviously, the more corner reflectors there are, the more sampling points there are, and the smoother the radiation pattern drawn is, and the closer it is to the test results in the anechoic chamber. The 9-corner reflector solution of the present invention covers several angular directions that are most concerned about in automotive radar applications, can meet the requirements of most application scenarios, can reduce the test cost, and can completely express the test status and information.

[0085] In another embodiment, the gain test of the waveguide antenna to be tested is carried out according to the following steps.

[0086] 1. During each production test, first test the standard gold machine antenna on this system. According to the above process, obtain its amplitude level L_golden. This antenna has passed the radar installation test, so the gain Gain_golden is a known parameter.

[0087] 2. Then test the waveguide antenna to be tested to obtain the level L_ant, that is, the data in Figure 13 .

[0088] 3. According to the gain calculation formula, Gain_ant. = Gain_golden - (L_golden - L_ant), the gain value of each frequency point of the current test port of the waveguide antenna to be tested can be obtained. And so on for other ports.

[0089] The above three steps are calculated in real time through the test platform software of this system to obtain the gain of the current test port of each waveguide antenna to be tested. After all ports are tested, a gain value table of all ports of the entire waveguide antenna to be tested can be obtained.

[0090] As shown in Table 1 below, it is the test gain value of an 8T8R antenna obtained according to the above method.

[0091] Table 1

[0092]

[0093] The above-described embodiments only represent several implementation manners of the present disclosure. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present disclosure, several modifications and improvements can still be made, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure patent shall be subject to the appended claims.

Claims

1. A vehicle-mounted radar waveguide antenna testing device, characterized in that: include: Test the dark box, A waveguide antenna test assembly, wherein the waveguide antenna test assembly is arranged in the test dark box, and the waveguide antenna test assembly comprises an antenna test bench and an antenna position adjustment test piece, wherein the antenna test bench is used to place the waveguide antenna to be tested, the antenna test bench is connected to the inner wall of the test dark box, the antenna test bench and the antenna position adjustment test piece are arranged opposite to each other, and the test end of the antenna position adjustment test piece is used to be connected with each test end of the waveguide antenna to be tested in batches; The waveguide antenna test assembly also includes at least two first test angles and at least two second test angles, at least two of the first test angles are distributed on a first test plane, and at least two of the first test angles have opposite horizontal angles, at least two of the second test angles are distributed on a second test plane, and at least two of the second test angles have opposite vertical angles, wherein the first test plane and the second test plane are both perpendicular to the antenna test bench, and an angle is formed between the first test plane and the second test plane.

2. The vehicle-mounted radar waveguide antenna testing device according to claim 1, characterized in that: The first test plane and the second test plane are perpendicular to each other.

3. The vehicle-mounted radar waveguide antenna testing device according to claim 1, characterized in that: At least two of the first test angles are at different distances from the antenna test station.

4. The vehicle-mounted radar waveguide antenna testing device according to claim 1, characterized in that: At least two of the second test angles are at different distances from the antenna test station.

5. The vehicle-mounted radar waveguide antenna testing device according to claim 1, characterized in that: The waveguide antenna test assembly also includes a top measuring angle invertor, which is located on the first test plane, and the distance between the top measuring angle invertor and the antenna test bench is greater than the distance between each of the first test angle invertors and the antenna test bench.

6. The vehicle-mounted radar waveguide antenna testing device according to claim 5, characterized in that: The top test angle inversion and all first test angle inversions are distributed in a circular arc with the antenna test bench as the arc center.

7. The vehicle-mounted radar waveguide antenna testing device according to claim 1, characterized in that: The antenna positioning test piece includes a multi-axis positioner and an antenna tester, the test end of the antenna tester is directed toward the waveguide antenna to be tested on the antenna test bench, the antenna tester is arranged on the multi-axis positioner, and the multi-axis positioner is used to adjust the distance between the test end of the antenna tester and the waveguide antenna to be tested on the antenna test bench.

8. The vehicle-mounted radar waveguide antenna testing device according to claim 7, characterized in that: The antenna positioning test piece also includes a single-axis mover, which is connected to the multi-axis positioner, and the moving end of the single-axis mover is connected to the test end of the antenna tester. The single-axis mover is used to adjust the relative position of the test end of the antenna tester and the angular reverse test end of the waveguide antenna to be tested.

9. The vehicle-mounted radar waveguide antenna testing device according to claim 1, characterized in that: The test dark box comprises a box body and an inner wall absorbing layer, wherein the inner wall absorbing layer covers the inner wall of the box body.

10. A vehicle-mounted radar waveguide antenna testing method using the vehicle-mounted radar waveguide antenna testing device according to any one of claims 1 to 9, characterized in that: include: Place the waveguide antenna to be tested on the antenna test bench; Start the signal transceiver function of the waveguide antenna to be tested, and sample the test end angle inversion signal of the waveguide antenna to be tested; The test end of the antenna positioning test piece is driven to move, so as to sample the angular inversion signals corresponding to the remaining test ends of the waveguide antenna to be tested in batches.

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