Automobile millimeter wave radar antenna test method and antenna test system

Abstract

The invention belongs to the technical field of radar antenna testing, and discloses an automobile millimeter wave radar antenna testing method and an antenna testing system. Comprising the steps of installing a to-be-tested automobile millimeter wave radar antenna; performing a static test on the installed to-be-tested automobile millimeter-wave radar antenna through a vector network analyzer, and judging whether the static test of the to-be-tested automobile millimeter-wave radar antenna is qualified or not; performing a far-field pattern test on the to-be-tested automobile millimeter-wave radar antenna which is qualified in the static test, and judging whether the far-field pattern test is qualified or not; dynamically testing the to-be-tested automobile millimeter-wave radar antenna with the qualified far-field pattern test, judging whether the speed measurement accuracy of the to-be-tested automobile millimeter-wave radar antenna is qualified, if the speed measurement accuracy is qualified, determining that the to-be-tested automobile millimeter-wave radar antenna is integrally qualified, and if the speed measurement accuracy is not qualified, determining that the to-be-tested automobile millimeter-wave radar antenna is not qualified. If so, the whole to-be-tested automobile millimeter wave radar antenna is unqualified; and the test accuracy is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of radar antenna testing, and more specifically, to a method and system for testing an automotive millimeter-wave radar antenna. Background Art

[0002] The patent application with the publication number CN117805748A discloses a method and system for testing automotive millimeter-wave radar antennas. The steps of the method are as follows: S1, setting the first radar at the first station and configuring the transmission waveform of the first radar; S2, setting the radar to be tested at the second station, setting the interval L between the first station and the second station, configuring the transmission channel of the radar to be tested, and traversing each transmission channel to transmit a point frequency signal; S3, the first radar samples the point frequency signal emitted by the radar to be tested through the signal receiving channel in the peak smoothing section of the transmission waveform to obtain a sampling signal, processes the sampling signal to obtain a heat map, and obtains the antenna reference power based on the heat map; S4, based on the antenna reference power, judges whether the antenna performance of the radar to be tested meets the standard. The invention proposes a method and system for testing automotive millimeter-wave radar antennas, which can realize the test of the radio frequency index items of millimeter-wave radars and improve the test accuracy and test efficiency.

[0003] However, in the process of symmetry analysis of the angle-power value pattern, the traditional method performs symmetry analysis on the angle-power value pattern by comparing the side lobes on the left and right sides. This method is not precise enough. In addition to the side lobes on the left and right sides, there are other curves that are not compared, which reduces the accuracy of the symmetry analysis, and then reduces the precision and accuracy of the test. When the car behind the car changes from one speed to another, there are many ways of changing, such as changing slowly all the time or changing quickly directly or changing quickly first and then changing slowly, etc. The speed change method detected by the car's radar and the actual speed change method are too different, which may cause safety accidents and lead to rear-end collisions and other traffic accidents. Failure to use the difference between the speed change method detected by the car's radar and the actual speed change method as a test factor will lead to reduced precision and accuracy of the test, resulting in the use of millimeter-wave radar antennas that have not passed the test, thereby increasing the risk of rear-end collisions and other traffic accidents.

[0004] In view of this, the present invention proposes a vehicle millimeter wave radar antenna testing method and antenna testing system to solve the above problems. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art and to achieve the above-mentioned purpose, the present invention provides the following technical solution: a method for testing an automotive millimeter-wave radar antenna, comprising: Step S1: installing the millimeter wave radar antenna of the vehicle to be tested; Step S2: statically testing the installed automotive millimeter-wave radar antenna to be tested by means of a vector network analyzer to obtain an input reflection coefficient of the automotive millimeter-wave radar antenna to be tested, and judging whether the input reflection loss of the automotive millimeter-wave radar antenna to be tested is qualified by means of the input reflection coefficient; Step S3: Perform a far-field pattern test on the automotive millimeter-wave radar antenna to be tested with qualified input reflection loss to obtain an angle-power value pattern, and analyze the angle-power value pattern to obtain an actual transmission coefficient, a half-power beam width, a main-side lobe difference coefficient, and a symmetry difference, and judge whether the far-field pattern test is qualified based on the actual transmission coefficient, the half-power beam width, the main-side lobe difference coefficient, and the symmetry difference; Step S4: Dynamically test the millimeter-wave radar antenna of the automobile to be tested that has passed the far-field pattern test, obtain the actual speed change curve graph of the interference vehicle and the test speed change curve graph of the interference vehicle, obtain the speed measurement accuracy evaluation coefficient by analyzing the actual speed change curve graph of the interference vehicle and the test speed change curve graph of the interference vehicle, and judge whether the speed measurement accuracy of the millimeter-wave radar antenna of the automobile to be tested is qualified according to the speed measurement accuracy evaluation coefficient. If the speed measurement accuracy is qualified, the millimeter-wave radar antenna of the automobile to be tested is qualified as a whole. If the speed measurement accuracy is unqualified, the millimeter-wave radar antenna of the automobile to be tested is unqualified as a whole.

[0006] Furthermore, the method for installing the millimeter-wave radar antenna of the vehicle to be tested includes: Fix the millimeter-wave radar antenna of the vehicle to be tested on the electric rotating table through a special bracket, and calculate the minimum far-field distance according to the operating frequency of the millimeter-wave radar antenna of the vehicle to be tested ; in, ; is the size of the millimeter-wave radar antenna of the vehicle to be tested, is the wavelength; Obtain the test distance between the millimeter-wave radar antenna and the receiving antenna of the vehicle to be tested based on the minimum far-field distance ; in, ; is the adjustment factor for the minimum far-field distance, and ; Place the receiving antenna at a distance from the millimeter-wave radar antenna of the vehicle to be tested. At the same height and horizontal plane as the receiving antenna and the millimeter-wave radar antenna of the vehicle to be tested, adjust the angle of the millimeter-wave radar antenna of the vehicle to be tested until the main lobe direction of the millimeter-wave radar antenna of the vehicle to be tested is facing the receiving antenna.

[0007] Furthermore, the method of performing a static test on the installed automotive millimeter-wave radar antenna to be tested by a vector network analyzer to obtain the input reflection coefficient of the automotive millimeter-wave radar antenna to be tested includes: The millimeter-wave radar antenna of the vehicle to be tested is connected to the vector network analyzer, and the test frequency band and the number of frequency sweep points are set by the vector network analyzer. After the setting is completed, the millimeter-wave radar antenna of the vehicle to be tested is tested by the vector network analyzer. The input reflection coefficient of the millimeter-wave radar antenna of the vehicle to be tested is obtained by reading the test result of the vector network analyzer on the millimeter-wave radar antenna of the vehicle to be tested.

[0008] Furthermore, the method for judging whether the input reflection loss of the automotive millimeter-wave radar antenna to be tested is qualified by input reflection coefficient includes: Set the input reflection coefficient threshold; When the input reflection coefficient is less than the input reflection coefficient threshold, the input reflection loss of the automotive millimeter-wave radar antenna to be tested is qualified; when the input reflection coefficient is greater than or equal to the input reflection coefficient threshold, the input reflection loss of the automotive millimeter-wave radar antenna to be tested is unqualified.

[0009] Furthermore, the method for obtaining the angle-power value pattern includes: Connect the receiving antenna to the vector network analyzer and record the initial position of the millimeter-wave radar antenna of the vehicle to be tested as The millimeter-wave radar antenna of the vehicle to be tested is measured by a vector network analyzer. When the forward transmission coefficient between the millimeter-wave radar antenna of the vehicle to be tested and the receiving antenna is , the electric turntable is started to rotate the millimeter-wave radar antenna of the vehicle to be tested, and each rotation to the right , until it rotates to , each time it rotates, the forward transmission coefficient is obtained; The millimeter-wave radar antenna of the vehicle to be tested is rotated to the initial position by the electric rotating table, and the millimeter-wave radar antenna of the vehicle to be tested is rotated to the left each time by controlling the electric rotating table. , until it rotates to , each time it rotates, the forward transmission coefficient is obtained, and the millimeter-wave radar antenna of the car to be tested is obtained as , , ,……, , , ,……, The forward transmission coefficient between the millimeter-wave radar antenna and the receiving antenna of the vehicle to be tested when ; Establish a blank two-dimensional rectangular coordinate system, set the horizontal coordinate of the blank two-dimensional rectangular coordinate system to the angle, set the vertical coordinate of the blank two-dimensional rectangular coordinate system to the forward transmission coefficient, and set the millimeter-wave radar antenna of the vehicle to be tested to , , ,……, , , ,……, The forward transmission coefficient between the millimeter-wave radar antenna and the receiving antenna of the vehicle to be tested is filled in the blank two-dimensional rectangular coordinate system to obtain the forward transmission coefficient mapping points, and the forward transmission coefficient mapping points are connected in sequence by straight lines in order from small to large angles to obtain the angle-power value direction diagram.

[0010] Furthermore, the method for determining whether the far-field pattern test is qualified includes: The far-field radiation pattern simulation test of the millimeter-wave radar antenna of the vehicle to be tested is performed through electromagnetic simulation software to obtain the angle-power value simulation radiation pattern, and the maximum forward transmission coefficient corresponding to the forward transmission coefficient mapping point in the angle-power value simulation radiation pattern is obtained and recorded as the standard transmission coefficient; Obtain the maximum forward transmission coefficient corresponding to the forward transmission coefficient mapping point in the angle-power value pattern, and record it as the actual transmission coefficient; Subtract the standard transmission coefficient from , is a positive integer, and the first subtraction result is obtained. If the actual transmission coefficient is less than the first subtraction result, the far-field pattern test fails; If the actual transmission coefficient is greater than or equal to the first subtraction result, a line parallel to the vertical axis is drawn through the forward transmission coefficient mapping point corresponding to the maximum forward transmission coefficient, and the angle-power value pattern on the left side of the parallel line is recorded as the left half angle-power value pattern, and the angle-power value pattern on the right side of the parallel line is recorded as the right half angle-power value pattern. The actual transmission coefficient is subtracted from , , obtain the second subtraction result; Starting from the forward transmission coefficient mapping point corresponding to the maximum forward transmission coefficient, obtain the angle corresponding to the first forward transmission coefficient equal to the second subtraction result in the right half angle-power value pattern, and record it as the right angle, obtain the angle corresponding to the first forward transmission coefficient equal to the second subtraction result in the left half angle-power value pattern, and record it as the left angle; Subtract the left angle from the right angle to obtain the half-power beam width, and set the half-power beam width threshold range. If the half-power beam width exceeds the half-power beam width threshold range, the far-field pattern test fails. If the half-power beam width does not exceed the half-power beam width threshold range, the second largest forward transmission coefficient corresponding to the forward transmission coefficient mapping point in the angle-power value pattern is obtained and recorded as the second transmission coefficient; Subtract the actual transmission coefficient from the second transmission coefficient to obtain the main-side lobe difference coefficient, set the main-side lobe difference coefficient threshold, and if the main-side lobe difference coefficient is greater than the main-side lobe difference coefficient threshold, the far-field pattern test fails; If the main-side lobe difference coefficient is less than or equal to the main-side lobe difference coefficient threshold, the symmetry difference between the left half angle-power value pattern and the right half angle-power value pattern is obtained, and the symmetry analysis of the angle-power value pattern is performed according to the symmetry difference; If the symmetry of the angle-power value pattern fails, the far-field pattern test fails; if the symmetry of the angle-power value pattern passes, the far-field pattern test passes.

[0011] Further, the method for performing symmetry analysis on the angle-power value pattern includes: The forward transmission coefficient corresponding to an angle of 1° minus the angle is The corresponding forward transmission coefficient is calculated by taking the absolute value of the subtraction result, and the angle is The corresponding forward transmission coefficient minus the angle is The corresponding forward transmission coefficient is calculated by taking the absolute value of the subtraction result, and so on. The corresponding forward transmission coefficient minus the angle is The corresponding forward transmission coefficient, the absolute value operation is performed on the subtraction result, all the absolute value operation results are added together to obtain the symmetric difference between the left half angle-power value pattern and the right half angle-power value pattern; Set the symmetry difference threshold. If the symmetry difference is greater than the symmetry difference threshold, the symmetry of the angle-power value pattern is unqualified. Otherwise, the symmetry of the angle-power value pattern is qualified.

[0012] Furthermore, the method for determining whether the speed measurement accuracy of the millimeter-wave radar antenna of the vehicle to be tested is qualified includes: Install the millimeter-wave radar antenna of the vehicle to be tested at the corresponding position of the test vehicle, control the test vehicle to drive at a constant speed in the closed road test site, and control the interference vehicle to km / h speed behind the test vehicle m at a constant speed, and the speed of the jammer vehicle and the distance between the test vehicle and the jammer vehicle are measured by the millimeter-wave radar antenna of the vehicle to be tested; Get the speed of the jammer vehicle measured by the millimeter-wave radar antenna of the vehicle to be tested and The absolute value of the difference between the test vehicle and the interference vehicle and The absolute value of the difference between the speed difference and the distance difference is set respectively. The absolute value of the difference between the test vehicle and the interference vehicle is greater than the absolute value threshold of the speed difference, or the distance between the test vehicle and the interference vehicle is greater than When the absolute value of the difference is greater than the distance difference absolute value threshold, the speed measurement accuracy of the millimeter-wave radar antenna of the vehicle to be tested is unqualified; When the measured speed of the jammer vehicle is The absolute value of the difference between the speed difference and the interference vehicle is less than or equal to the absolute value threshold of the speed difference, and the distance between the test vehicle and the interference vehicle is When the absolute value of the difference is less than or equal to the distance difference absolute value threshold, the interference vehicle is controlled from km / h to km / h, and obtain the start acceleration time and end acceleration time of the interference vehicle, and divide the time period from the start acceleration time to the end acceleration time into time points, and obtain the actual speed of the jammer vehicle corresponding to each time point and the speed of the jammer vehicle measured by the millimeter-wave radar antenna of the vehicle to be tested; According to the actual speed of the jammer car corresponding to each time point and the speed of the jammer car measured by the millimeter-wave radar antenna of the vehicle to be tested, the actual speed change curve of the jammer car and the test speed change curve of the jammer car are constructed respectively, and the speed measurement accuracy evaluation coefficient is obtained according to the actual speed change curve of the jammer car and the test speed change curve of the jammer car ; Set the speed measurement accuracy evaluation coefficient threshold ,when When the speed measurement accuracy of the millimeter wave radar antenna of the tested vehicle is not up to standard, When the speed measurement accuracy of the millimeter-wave radar antenna of the vehicle to be tested is qualified.

[0013] Furthermore, the actual speed change curve of the jamming vehicle and the test speed change curve of the jamming vehicle are constructed respectively, and the speed measurement accuracy evaluation coefficient is obtained according to the actual speed change curve of the jamming vehicle and the test speed change curve of the jamming vehicle. The methods include: Create a blank coordinate system. Fill the time points into the abscissa of the blank coordinate system in sequence, set the ordinate of the blank coordinate system as speed, and fill the actual speed of the jammer vehicle corresponding to the time point into the blank coordinate system, draw a curve, and obtain a curve diagram of the actual speed change of the jammer vehicle; Create a new blank coordinate system. The time points are filled into the abscissa of the new blank coordinate system in sequence, the ordinate of the new blank coordinate system is set as the speed, and the speed of the jamming vehicle measured by the millimeter-wave radar antenna of the vehicle to be tested corresponding to the time point is filled into the new blank coordinate system, and a curve is drawn to obtain a test speed change curve of the jamming vehicle; The speed measurement accuracy evaluation coefficient is obtained based on the actual speed change curve of the jamming vehicle and the test speed change curve of the jamming vehicle. ; in, ; for The weight coefficient of for The weight coefficient of , , and They are the start acceleration time and the end acceleration time of the jammer vehicle, for arrive The actual speed change curve function of the jammer vehicle within the time period, for arrive The test speed change curve function of the jammer vehicle within the time period, represents the time independent variable, The speed of the jammer vehicle measured by the millimeter-wave radar antenna of the vehicle under test corresponding to the end acceleration time.

[0014] An automotive millimeter wave radar antenna test system, comprising: Antenna installation assembly, responsible for installing the millimeter-wave radar antenna of the vehicle to be tested; The static test component is responsible for performing a static test on the installed automotive millimeter-wave radar antenna to be tested through a vector network analyzer to obtain the input reflection coefficient of the automotive millimeter-wave radar antenna to be tested, and judging whether the input reflection loss of the automotive millimeter-wave radar antenna to be tested is qualified through the input reflection coefficient; The far-field pattern test component is responsible for performing a far-field pattern test on the automotive millimeter-wave radar antenna to be tested with qualified input reflection loss to determine whether the far-field pattern test is qualified; The dynamic test component is responsible for dynamically testing the millimeter-wave radar antenna of the vehicle to be tested that has passed the far-field pattern test, and judging whether the speed measurement accuracy of the millimeter-wave radar antenna of the vehicle to be tested is qualified. If the speed measurement accuracy is qualified, the millimeter-wave radar antenna of the vehicle to be tested is qualified as a whole; if the speed measurement accuracy is unqualified, the millimeter-wave radar antenna of the vehicle to be tested is unqualified as a whole.

[0015] Technical effects and advantages of a vehicle millimeter wave radar antenna testing method and antenna testing system of the present invention: 1. The input reflection coefficient is used to determine whether the input reflection loss of the automotive millimeter-wave radar antenna to be tested is qualified, thereby ensuring that the automotive millimeter-wave radar antenna to be tested with unqualified input reflection loss is not used, thereby reducing the probability of car accidents due to automotive radar quality problems; 2. The far-field pattern test is judged to be qualified based on the actual transmission coefficient, half-power beam width, main-side lobe difference coefficient and symmetry difference. In the process of symmetry analysis of the angle-power value pattern, the symmetry of the angle-power value pattern is judged to be qualified by comparing the forward transmission coefficients corresponding to all angles on the left and right sides, thereby increasing the accuracy of the judgment on whether the symmetry of the angle-power value pattern is qualified, and then increasing the test precision and accuracy; 3. The speed measurement accuracy of the millimeter-wave radar antenna of the vehicle to be tested is judged by the difference between the speed change mode detected by the vehicle radar and the actual speed change mode, which further increases the accuracy of the speed measurement accuracy judgment, thereby increasing the test precision and accuracy, avoiding the use of millimeter-wave radar antennas that have not passed the test, thereby reducing the risk of rear-end collisions and other traffic accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a method for testing a millimeter-wave radar antenna for an automobile according to the present invention; Figure 2 A schematic diagram of a vehicle millimeter wave radar antenna test system of the present invention; Figure 3 The present invention is a flow chart for judging whether a far-field pattern test is qualified. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Example 1, please refer to Figure 1 and Figure 3 As shown, a method for testing a millimeter-wave radar antenna for an automobile described in this embodiment includes: Step S1: installing the millimeter wave radar antenna of the vehicle to be tested; Step S2: statically testing the installed automotive millimeter-wave radar antenna to be tested by means of a vector network analyzer to obtain an input reflection coefficient of the automotive millimeter-wave radar antenna to be tested, and judging whether the input reflection loss of the automotive millimeter-wave radar antenna to be tested is qualified by means of the input reflection coefficient; Step S3: Perform a far-field pattern test on the automotive millimeter-wave radar antenna to be tested with qualified input reflection loss to obtain an angle-power value pattern, and analyze the angle-power value pattern to obtain an actual transmission coefficient, a half-power beam width, a main-side lobe difference coefficient, and a symmetry difference, and judge whether the far-field pattern test is qualified based on the actual transmission coefficient, the half-power beam width, the main-side lobe difference coefficient, and the symmetry difference; Step S4: Dynamically test the millimeter-wave radar antenna of the automobile to be tested that has passed the far-field pattern test, obtain the actual speed change curve graph of the interference vehicle and the test speed change curve graph of the interference vehicle, obtain the speed measurement accuracy evaluation coefficient by analyzing the actual speed change curve graph of the interference vehicle and the test speed change curve graph of the interference vehicle, and judge whether the speed measurement accuracy of the millimeter-wave radar antenna of the automobile to be tested is qualified according to the speed measurement accuracy evaluation coefficient. If the speed measurement accuracy is qualified, the millimeter-wave radar antenna of the automobile to be tested is qualified as a whole. If the speed measurement accuracy is unqualified, the millimeter-wave radar antenna of the automobile to be tested is unqualified as a whole.

[0019] The process of installing the millimeter wave radar antenna on the vehicle to be tested includes: Fix the millimeter-wave radar antenna of the vehicle to be tested on the electric rotating table through a special bracket, and calculate the minimum far-field distance according to the operating frequency of the millimeter-wave radar antenna of the vehicle to be tested ; in, ; is the size of the millimeter-wave radar antenna of the vehicle to be tested, is the wavelength; in, ; is the speed of light, is the operating frequency of the millimeter-wave radar antenna of the vehicle to be tested; Obtain the test distance between the millimeter-wave radar antenna and the receiving antenna of the vehicle to be tested based on the minimum far-field distance ; in, ; is the adjustment factor for the minimum far-field distance, and ,The adjustment coefficient of the minimum far field distance can be set through experimental data analysis or experience; Place the receiving antenna at a distance from the millimeter-wave radar antenna of the vehicle to be tested. At the same height and horizontal plane as the receiving antenna and the millimeter-wave radar antenna of the vehicle to be tested, adjust the angle of the millimeter-wave radar antenna of the vehicle to be tested until the main lobe direction of the millimeter-wave radar antenna of the vehicle to be tested is facing the receiving antenna.

[0020] The process of performing a static test on the installed automotive millimeter-wave radar antenna to be tested by a vector network analyzer to obtain the input reflection coefficient of the automotive millimeter-wave radar antenna to be tested includes: Connect the millimeter-wave radar antenna of the vehicle to be tested to the vector network analyzer, set the test frequency band and the number of frequency sweep points through the vector network analyzer, test the millimeter-wave radar antenna of the vehicle to be tested through the vector network analyzer after the setting is completed, and obtain the input reflection coefficient of the millimeter-wave radar antenna of the vehicle to be tested by reading the test result of the millimeter-wave radar antenna of the vehicle to be tested by the vector network analyzer; The process of judging whether the input reflection loss of the automotive millimeter-wave radar antenna to be tested is qualified by input reflection coefficient includes: Set the input reflection coefficient threshold, which can be set through experimental data analysis or experience; When the input reflection coefficient is less than the input reflection coefficient threshold, the input reflection loss of the automotive millimeter-wave radar antenna to be tested is qualified; when the input reflection coefficient is greater than or equal to the input reflection coefficient threshold, the input reflection loss of the automotive millimeter-wave radar antenna to be tested is unqualified; It needs to be explained that when the input reflection loss fails to meet the requirements, the millimeter-wave radar antenna of the vehicle to be tested fails as a whole; It needs to be explained that the input reflection coefficient represents the return loss, that is, how much energy is reflected back to the transmitter. The smaller the input reflection coefficient, the less energy is reflected back to the transmitter, the smaller the input reflection loss, and the better the antenna performance.

[0021] The process of conducting a far-field pattern test on the automotive millimeter-wave radar antenna to be tested with qualified input reflection loss and obtaining the angle-power value pattern includes: Connect the receiving antenna to the vector network analyzer and record the initial position of the millimeter-wave radar antenna of the vehicle to be tested as The millimeter-wave radar antenna of the vehicle to be tested is measured by a vector network analyzer. When the forward transmission coefficient between the millimeter-wave radar antenna of the vehicle to be tested and the receiving antenna is , the electric turntable is started to rotate the millimeter-wave radar antenna of the vehicle to be tested, and each rotation to the right , until it rotates to , each rotation, obtain the forward transmission coefficient between the millimeter-wave radar antenna of the vehicle to be tested and the receiving antenna, rotate the millimeter-wave radar antenna of the vehicle to be tested to the initial position through the electric turntable, control the electric turntable to rotate the millimeter-wave radar antenna of the vehicle to be tested, and rotate left each time , until it rotates to , each time it rotates, the forward transmission coefficient between the millimeter-wave radar antenna of the vehicle to be tested and the receiving antenna is obtained, so that the millimeter-wave radar antenna of the vehicle to be tested is obtained as , , ,……, , , ,……, The forward transmission coefficient between the millimeter-wave radar antenna and the receiving antenna of the vehicle to be tested when ; It should be explained that the forward transmission coefficient represents the insertion loss, that is, how much energy is transmitted to the receiving antenna. The forward transmission coefficient represents the energy transmitted to the receiving antenna, which indirectly represents the power of the signal received by the receiving antenna; Establish a blank two-dimensional rectangular coordinate system, set the horizontal coordinate of the blank two-dimensional rectangular coordinate system to the angle, set the vertical coordinate of the blank two-dimensional rectangular coordinate system to the forward transmission coefficient, and set the millimeter-wave radar antenna of the vehicle to be tested to , , ,……, , , ,……, The forward transmission coefficient between the millimeter-wave radar antenna and the receiving antenna of the vehicle to be tested is filled in a blank two-dimensional rectangular coordinate system to obtain the forward transmission coefficient mapping points, and the forward transmission coefficient mapping points are sequentially connected by straight lines in order from small to large angles to obtain the angle-power value direction diagram; By analyzing the angle-power value pattern, the process of judging whether the far-field pattern test is qualified includes: The far-field radiation pattern simulation test of the millimeter-wave radar antenna of the vehicle to be tested is performed through electromagnetic simulation software to obtain the angle-power value simulation radiation pattern, and the maximum forward transmission coefficient corresponding to the forward transmission coefficient mapping point in the angle-power value simulation radiation pattern is obtained and recorded as the standard transmission coefficient; Obtain the maximum forward transmission coefficient corresponding to the forward transmission coefficient mapping point in the angle-power value pattern, and record it as the actual transmission coefficient; Subtract the standard transmission coefficient from , is a positive integer, The value of can be set through experimental data analysis or experience, and The value of is generally 2, and the first subtraction result is obtained. If the actual transmission coefficient is less than the first subtraction result, the far-field pattern test fails. It needs to be explained that if the maximum forward transmission coefficient is too low, the feeder loss of the millimeter-wave radar antenna of the vehicle to be tested is abnormal, so the maximum forward transmission coefficient is used as a test factor; If the actual transmission coefficient is greater than or equal to the first subtraction result, a line parallel to the vertical axis is drawn through the forward transmission coefficient mapping point corresponding to the maximum forward transmission coefficient, and the angle-power value pattern on the left side of the parallel line is recorded as the left half angle-power value pattern, and the angle-power value pattern on the right side of the parallel line is recorded as the right half angle-power value pattern. The actual transmission coefficient is subtracted from , , obtain the second subtraction result, starting from the forward transmission coefficient mapping point corresponding to the maximum forward transmission coefficient, obtain the angle corresponding to the first forward transmission coefficient in the right half angle-power value pattern that is equal to the second subtraction result, and record it as the right angle, starting from the forward transmission coefficient mapping point corresponding to the maximum forward transmission coefficient, obtain the angle corresponding to the first forward transmission coefficient in the left half angle-power value pattern that is equal to the second subtraction result, and record it as the left angle; Subtract the left angle from the right angle to obtain the half-power beam width, and set the half-power beam width threshold range. The half-power beam width threshold range can be set through experimental data analysis or experience. If the half-power beam width exceeds the half-power beam width threshold range, the far-field pattern test fails; It should be explained that if the half-power beam width is too large, it may cause problems such as beam diffusion and poor directivity. If the half-power beam width is too small, it may cause problems such as too strong directivity and affect the coverage area. Therefore, the half-power beam width is used as a test factor. If the half-power beam width does not exceed the half-power beam width threshold range, the second largest forward transmission coefficient corresponding to the forward transmission coefficient mapping point in the angle-power value pattern is obtained and recorded as the second transmission coefficient; Subtract the actual transmission coefficient from the second transmission coefficient to obtain the main-side lobe difference coefficient, and set the main-side lobe difference coefficient threshold. The main-side lobe difference coefficient threshold can be set through experimental data analysis or experience. If the main-side lobe difference coefficient is greater than the main-side lobe difference coefficient threshold, the far-field pattern test fails. It needs to be explained that if the difference between the main lobe and the side lobe is too large, that is, the side lobe is too high, it may cause interference echo, radar false triggering and misjudgment, etc. Therefore, the difference between the main lobe and the side lobe is used as a test factor; If the main-side lobe difference coefficient is less than or equal to the main-side lobe difference coefficient threshold, the symmetry difference between the left half angle-power value pattern and the right half angle-power value pattern is obtained, and the symmetry analysis of the angle-power value pattern is performed according to the symmetry difference; The process of obtaining a symmetry difference between a left half angle-power value pattern and a right half angle-power value pattern and performing symmetry analysis on the angle-power value pattern according to the symmetry difference includes: The forward transmission coefficient corresponding to an angle of 1° minus the angle is The corresponding forward transmission coefficient is calculated by taking the absolute value of the subtraction result, and the angle is The corresponding forward transmission coefficient minus the angle is The corresponding forward transmission coefficient is calculated by taking the absolute value of the subtraction result, and the angle is The corresponding forward transmission coefficient minus the angle is The corresponding forward transmission coefficient is calculated by taking the absolute value of the subtraction result, and so on. The corresponding forward transmission coefficient minus the angle is The corresponding forward transmission coefficient, the absolute value operation is performed on the subtraction result, all the absolute value operation results are added together to obtain the symmetric difference between the left half angle-power value pattern and the right half angle-power value pattern; It should be explained that, during the installation of the millimeter-wave radar antenna of the vehicle to be tested, the angle of the millimeter-wave radar antenna of the vehicle to be tested is adjusted until the main lobe direction of the millimeter-wave radar antenna of the vehicle to be tested faces the receiving antenna. Therefore, the angle corresponding to the maximum forward transmission coefficient is ; Set the symmetry difference threshold. The symmetry difference threshold can be set through experimental data analysis or experience. If the symmetry difference between the left half angle-power value pattern and the right half angle-power value pattern is greater than the symmetry difference threshold, the symmetry of the angle-power value pattern is unqualified and the far-field pattern test is unqualified. If the symmetry difference between the left half angle-power value pattern and the right half angle-power value pattern is less than or equal to the symmetry difference threshold, the symmetry of the angle-power value pattern is qualified and the far-field pattern test is qualified. It needs to be explained that when the far-field pattern test fails, the millimeter-wave radar antenna of the vehicle to be tested fails as a whole; It should be explained that if the symmetry of the angle-power value pattern is poor, it may be caused by unbalanced feeder and poor performance of radar components. Therefore, the symmetry of the angle-power value pattern is used as a test factor; It needs to be explained that the traditional method performs symmetry analysis on the angle-power value pattern by comparing the side lobes on the left and right sides. This method can only determine whether the side lobes on the left and right sides are symmetrical, but cannot determine whether the remaining parts on the left and right sides are symmetrical. It is not precise enough, which causes misjudgment of the symmetry of the angle-power value pattern, thereby reducing the test precision and accuracy. The present invention judges whether the symmetry of the angle-power value pattern is qualified by comparing the forward transmission coefficients corresponding to all angles on the left and right sides, and judges whether all parts on the left and right sides are symmetrical, thereby increasing the accuracy of judging whether the symmetry of the angle-power value pattern is qualified, thereby increasing the test precision and accuracy.

[0022] The process of dynamically testing the millimeter-wave radar antenna of the automobile to be tested that has passed the far-field pattern test and determining whether the speed measurement accuracy of the millimeter-wave radar antenna of the automobile to be tested is qualified includes: Install the millimeter-wave radar antenna of the vehicle to be tested at the corresponding position of the test vehicle, control the test vehicle to drive at a constant speed in the closed road test site, and control the interference vehicle to km / h speed behind the test vehicle m at a constant speed, and the speed of the jammer vehicle and the distance between the test vehicle and the jammer vehicle are measured by the millimeter-wave radar antenna of the vehicle to be tested; Get the speed of the jammer vehicle measured by the millimeter-wave radar antenna of the vehicle to be tested and The absolute value of the difference between the test vehicle and the interference vehicle and The absolute value of the difference between the measured speed and the distance difference is set, and the speed difference absolute value threshold and the distance difference absolute value threshold are set respectively. The speed difference absolute value threshold and the distance difference absolute value threshold can be set by experimental data analysis or experience. The absolute value of the difference between the test vehicle and the interference vehicle is greater than the absolute value threshold of the speed difference, or the distance between the test vehicle and the interference vehicle is greater than When the absolute value of the difference is greater than the distance difference absolute value threshold, the speed measurement accuracy of the millimeter-wave radar antenna of the vehicle to be tested is unqualified; When the measured speed of the jammer vehicle is The absolute value of the difference between the speed difference and the interference vehicle is less than or equal to the absolute value threshold of the speed difference, and the distance between the test vehicle and the interference vehicle is When the absolute value of the difference is less than or equal to the distance difference absolute value threshold, the interference vehicle is controlled from km / h to km / h, and obtain the start acceleration time and end acceleration time of the interference vehicle, and divide the time period from the start acceleration time to the end acceleration time into time points, and obtain the actual speed of the jammer vehicle corresponding to each time point; Create a blank coordinate system. Fill the time points into the abscissa of the blank coordinate system in sequence, set the ordinate of the blank coordinate system as speed, and fill the actual speed of the jammer vehicle corresponding to the time point into the blank coordinate system, draw a curve, and obtain a curve diagram of the actual speed change of the jammer vehicle; Obtain the speed of the jammer vehicle measured by the millimeter-wave radar antenna of the vehicle to be tested at each time point; Create a blank coordinate system. The time points are filled into the abscissa of the blank coordinate system in sequence, the ordinate of the blank coordinate system is set as the speed, and the speed of the jammer car measured by the millimeter-wave radar antenna of the vehicle to be tested corresponding to the time point is filled into the blank coordinate system, and a curve is drawn to obtain a test speed change curve of the jammer car; The speed measurement accuracy evaluation coefficient is obtained based on the actual speed change curve of the jamming vehicle and the test speed change curve of the jamming vehicle. ; in, ; for The weight coefficient of for The weight coefficient of , , and They are the start acceleration time and the end acceleration time of the jammer vehicle, for arrive The actual speed change curve function of the jammer vehicle within the time period, for arrive The test speed change curve function of the jammer vehicle within the time period, represents the time independent variable, The speed of the jammer vehicle measured by the millimeter-wave radar antenna of the vehicle under test corresponding to the end acceleration time; It should be explained that the actual speed change curve function of the jamming vehicle is the curve function in the actual speed change curve diagram of the jamming vehicle, and the test speed change curve function of the jamming vehicle is the curve function in the test speed change curve diagram of the jamming vehicle; Set the speed measurement accuracy evaluation coefficient threshold ,when When the speed measurement accuracy of the millimeter wave radar antenna of the tested vehicle is not up to standard, When the speed measurement accuracy of the millimeter-wave radar antenna of the vehicle to be tested is qualified; It should be explained that when the car behind the car changes from one speed to another, there are many ways of changing, such as changing slowly all the time or changing quickly directly or changing quickly first and then changing slowly, etc. If the speed change mode detected by the car's radar and the actual speed change mode are too different, it may cause safety accidents and lead to rear-end collisions and other car accidents. Therefore, the present invention uses the difference between the speed change mode detected by the car's radar and the actual speed change mode as a test factor to test the speed of the car behind the car. arrive The actual speed change curve function of the jamming vehicle in the time period is integrated to obtain the curve area enclosed by the actual speed change curve of the jamming vehicle and the coordinate axis. The curve area enclosed by the actual speed change curve of the jamming vehicle and the coordinate axis represents the actual speed change mode. arrive The interference vehicle test speed change curve function within the time period is integrated to obtain the curve area enclosed by the interference vehicle test speed change curve and the coordinate axis. The curve area enclosed by the interference vehicle test speed change curve and the coordinate axis represents the speed change mode detected by the automobile radar. The absolute value of the difference between the speed change mode detected by the automobile radar and the actual speed change mode. At the end of acceleration, the greater the absolute value of the difference between the interference vehicle speed detected by the automobile radar and the actual speed of the interference vehicle, the worse the performance of the automobile radar detection speed and the higher the delay. Therefore, the absolute value of the difference between the interference vehicle speed detected by the automobile radar and the actual speed of the interference vehicle at the end of acceleration is also used as a test factor. The difference between the speed change mode detected by the automobile radar and the actual speed change mode is combined with the absolute value of the difference between the interference vehicle speed detected by the automobile radar and the actual speed of the interference vehicle at the end of acceleration to obtain the speed measurement accuracy evaluation coefficient. The speed measurement accuracy evaluation coefficient is used to judge whether the speed measurement accuracy of the millimeter-wave radar antenna of the automobile to be tested is qualified, thereby increasing the precision and accuracy of the test, ensuring that the millimeter-wave radar antenna that fails the test is not used, thereby reducing the risk of rear-end collisions and other car accidents.

[0023] In this embodiment, the input reflection coefficient is used to determine whether the input reflection loss of the automotive millimeter-wave radar antenna to be tested is qualified, thereby ensuring that the automotive millimeter-wave radar antenna to be tested with unqualified input reflection loss is not used, thereby reducing the probability of a traffic accident due to automotive radar quality problems; the far-field pattern test is determined to be qualified based on the actual transmission coefficient, half-power beam width, main-side lobe difference coefficient, and symmetry difference. In the process of symmetry analysis of the angle-power value pattern, the symmetry of the angle-power value pattern is determined by comparing the forward transmission coefficients corresponding to all angles on the left and right sides, thereby increasing the accuracy of the judgment on whether the symmetry of the angle-power value pattern is qualified, thereby increasing the test precision and accuracy; the speed measurement accuracy of the automotive millimeter-wave radar antenna to be tested is determined to be qualified by the difference between the speed change mode detected by the automotive radar and the actual speed change mode, further increasing the accuracy of the judgment on whether the speed measurement accuracy is qualified, thereby increasing the test precision and accuracy, avoiding the use of millimeter-wave radar antennas that have not passed the test, thereby reducing the risk of traffic accidents such as rear-end collisions.

[0024] Example 2, please refer to Figure 2 As shown, the part not described in detail in this embodiment is described in Example 1, which provides a vehicle millimeter wave radar antenna test system, including: Antenna installation assembly, responsible for installing the millimeter-wave radar antenna of the vehicle to be tested; The static test component is responsible for performing a static test on the installed automotive millimeter-wave radar antenna to be tested through a vector network analyzer to obtain the input reflection coefficient of the automotive millimeter-wave radar antenna to be tested, and judging whether the input reflection loss of the automotive millimeter-wave radar antenna to be tested is qualified through the input reflection coefficient; The far-field pattern test component is responsible for performing a far-field pattern test on the automotive millimeter-wave radar antenna to be tested with qualified input reflection loss to determine whether the far-field pattern test is qualified; The dynamic test component is responsible for dynamically testing the millimeter-wave radar antenna of the vehicle to be tested that has passed the far-field pattern test, and judging whether the speed measurement accuracy of the millimeter-wave radar antenna of the vehicle to be tested is qualified. If the speed measurement accuracy is qualified, the millimeter-wave radar antenna of the vehicle to be tested is qualified as a whole; if the speed measurement accuracy is unqualified, the millimeter-wave radar antenna of the vehicle to be tested is unqualified as a whole.

[0025] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed in the present invention can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0026] In the several embodiments provided by the present invention, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of the units is only one, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0027] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0028] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for testing an automotive millimeter-wave radar antenna, characterized in that: The automotive millimeter wave radar antenna testing method comprises: Step S1: installing the millimeter wave radar antenna of the vehicle to be tested; Step S2: statically testing the installed automotive millimeter-wave radar antenna to be tested by means of a vector network analyzer to obtain an input reflection coefficient of the automotive millimeter-wave radar antenna to be tested, and judging whether the input reflection loss of the automotive millimeter-wave radar antenna to be tested is qualified by means of the input reflection coefficient; Step S3: Perform a far-field pattern test on the automotive millimeter-wave radar antenna to be tested with qualified input reflection loss to obtain an angle-power value pattern, and analyze the angle-power value pattern to obtain an actual transmission coefficient, a half-power beam width, a main-side lobe difference coefficient, and a symmetry difference, and judge whether the far-field pattern test is qualified based on the actual transmission coefficient, the half-power beam width, the main-side lobe difference coefficient, and the symmetry difference; Step S4: Dynamically test the millimeter-wave radar antenna of the automobile to be tested that has passed the far-field pattern test, obtain the actual speed change curve graph of the interference vehicle and the test speed change curve graph of the interference vehicle, obtain the speed measurement accuracy evaluation coefficient by analyzing the actual speed change curve graph of the interference vehicle and the test speed change curve graph of the interference vehicle, and judge whether the speed measurement accuracy of the millimeter-wave radar antenna of the automobile to be tested is qualified according to the speed measurement accuracy evaluation coefficient. If the speed measurement accuracy is qualified, the millimeter-wave radar antenna of the automobile to be tested is qualified as a whole. If the speed measurement accuracy is unqualified, the millimeter-wave radar antenna of the automobile to be tested is unqualified as a whole.

2. The automotive millimeter wave radar antenna testing method according to claim 1, characterized in that: The method for installing the millimeter wave radar antenna of the vehicle to be tested comprises: Fix the millimeter-wave radar antenna of the vehicle to be tested on the electric rotating table through a special bracket, and calculate the minimum far-field distance according to the operating frequency of the millimeter-wave radar antenna of the vehicle to be tested ; in, ; is the size of the millimeter-wave radar antenna of the vehicle to be tested, is the wavelength; Obtain the test distance between the millimeter-wave radar antenna and the receiving antenna of the vehicle to be tested based on the minimum far-field distance ; in, ; is the adjustment factor for the minimum far-field distance, and ; Place the receiving antenna at a distance from the millimeter-wave radar antenna of the vehicle to be tested. At the same height and horizontal plane as the receiving antenna and the millimeter-wave radar antenna of the vehicle to be tested, adjust the angle of the millimeter-wave radar antenna of the vehicle to be tested until the main lobe direction of the millimeter-wave radar antenna of the vehicle to be tested is facing the receiving antenna.

3. The automotive millimeter wave radar antenna testing method according to claim 2, characterized in that: The method of performing a static test on the installed automotive millimeter-wave radar antenna to be tested by a vector network analyzer to obtain the input reflection coefficient of the automotive millimeter-wave radar antenna to be tested comprises: The millimeter-wave radar antenna of the vehicle to be tested is connected to the vector network analyzer, and the test frequency band and the number of frequency sweep points are set by the vector network analyzer. After the setting is completed, the millimeter-wave radar antenna of the vehicle to be tested is tested by the vector network analyzer. The input reflection coefficient of the millimeter-wave radar antenna of the vehicle to be tested is obtained by reading the test result of the vector network analyzer on the millimeter-wave radar antenna of the vehicle to be tested.

4. The automotive millimeter wave radar antenna testing method according to claim 3, characterized in that: The method for judging whether the input reflection loss of the millimeter-wave radar antenna of the automobile to be tested is qualified by inputting the reflection coefficient comprises: Set the input reflection coefficient threshold; When the input reflection coefficient is less than the input reflection coefficient threshold, the input reflection loss of the automotive millimeter-wave radar antenna to be tested is qualified; when the input reflection coefficient is greater than or equal to the input reflection coefficient threshold, the input reflection loss of the automotive millimeter-wave radar antenna to be tested is unqualified.

5. The automotive millimeter wave radar antenna testing method according to claim 4, characterized in that: The method for obtaining the angle-power value pattern comprises: Connect the receiving antenna to the vector network analyzer and record the initial position of the millimeter-wave radar antenna of the vehicle to be tested as The millimeter-wave radar antenna of the vehicle to be tested is measured by a vector network analyzer. When the forward transmission coefficient between the millimeter-wave radar antenna of the vehicle to be tested and the receiving antenna is , the electric turntable is started to rotate the millimeter-wave radar antenna of the vehicle to be tested, and each rotation to the right , until it rotates to , each time it rotates, the forward transmission coefficient is obtained; The millimeter-wave radar antenna of the vehicle to be tested is rotated to the initial position by the electric rotating table, and the millimeter-wave radar antenna of the vehicle to be tested is rotated to the left each time by controlling the electric rotating table. , until it rotates to , each time it rotates, the forward transmission coefficient is obtained, and the millimeter-wave radar antenna of the car to be tested is obtained as , , ,……, , , ,……, The forward transmission coefficient between the millimeter-wave radar antenna and the receiving antenna of the vehicle to be tested when ; Establish a blank two-dimensional rectangular coordinate system, set the horizontal coordinate of the blank two-dimensional rectangular coordinate system to the angle, set the vertical coordinate of the blank two-dimensional rectangular coordinate system to the forward transmission coefficient, and set the millimeter-wave radar antenna of the vehicle to be tested to , , ,……, , , ,……, The forward transmission coefficient between the millimeter-wave radar antenna and the receiving antenna of the vehicle to be tested is filled in the blank two-dimensional rectangular coordinate system to obtain the forward transmission coefficient mapping points, and the forward transmission coefficient mapping points are connected in sequence by straight lines in order from small to large angles to obtain the angle-power value direction diagram.

6. The automotive millimeter wave radar antenna testing method according to claim 5, characterized in that: The method for judging whether the far-field pattern test is qualified comprises: The far-field radiation pattern simulation test of the millimeter-wave radar antenna of the vehicle to be tested is performed through electromagnetic simulation software to obtain the angle-power value simulation radiation pattern, and the maximum forward transmission coefficient corresponding to the forward transmission coefficient mapping point in the angle-power value simulation radiation pattern is obtained and recorded as the standard transmission coefficient; Obtain the maximum forward transmission coefficient corresponding to the forward transmission coefficient mapping point in the angle-power value pattern, and record it as the actual transmission coefficient; Subtract the standard transmission coefficient from , is a positive integer, and the first subtraction result is obtained. If the actual transmission coefficient is less than the first subtraction result, the far-field pattern test fails; If the actual transmission coefficient is greater than or equal to the first subtraction result, a line parallel to the vertical axis is drawn through the forward transmission coefficient mapping point corresponding to the maximum forward transmission coefficient, and the angle-power value pattern on the left side of the parallel line is recorded as the left half angle-power value pattern, and the angle-power value pattern on the right side of the parallel line is recorded as the right half angle-power value pattern. The actual transmission coefficient is subtracted from , , obtain the second subtraction result; Starting from the forward transmission coefficient mapping point corresponding to the maximum forward transmission coefficient, obtain the angle corresponding to the first forward transmission coefficient equal to the second subtraction result in the right half angle-power value pattern, and record it as the right angle, obtain the angle corresponding to the first forward transmission coefficient equal to the second subtraction result in the left half angle-power value pattern, and record it as the left angle; Subtract the left angle from the right angle to obtain the half-power beam width, and set the half-power beam width threshold range. If the half-power beam width exceeds the half-power beam width threshold range, the far-field pattern test fails. If the half-power beam width does not exceed the half-power beam width threshold range, the second largest forward transmission coefficient corresponding to the forward transmission coefficient mapping point in the angle-power value pattern is obtained and recorded as the second transmission coefficient; Subtract the actual transmission coefficient from the second transmission coefficient to obtain the main-side lobe difference coefficient, set the main-side lobe difference coefficient threshold, and if the main-side lobe difference coefficient is greater than the main-side lobe difference coefficient threshold, the far-field pattern test fails; If the main-side lobe difference coefficient is less than or equal to the main-side lobe difference coefficient threshold, the symmetry difference between the left half angle-power value pattern and the right half angle-power value pattern is obtained, and the symmetry analysis of the angle-power value pattern is performed according to the symmetry difference; If the symmetry of the angle-power value pattern fails, the far-field pattern test fails; if the symmetry of the angle-power value pattern passes, the far-field pattern test passes.

7. The automotive millimeter wave radar antenna testing method according to claim 6, characterized in that: The method for performing symmetry analysis on the angle-power value pattern comprises: The forward transmission coefficient corresponding to an angle of 1° minus the angle is The corresponding forward transmission coefficient is calculated by taking the absolute value of the subtraction result, and the angle is The corresponding forward transmission coefficient minus the angle is The corresponding forward transmission coefficient is calculated by taking the absolute value of the subtraction result, and so on. The corresponding forward transmission coefficient minus the angle is The corresponding forward transmission coefficient, the absolute value operation is performed on the subtraction result, all the absolute value operation results are added together to obtain the symmetric difference between the left half angle-power value pattern and the right half angle-power value pattern; Set the symmetry difference threshold. If the symmetry difference is greater than the symmetry difference threshold, the symmetry of the angle-power value pattern is unqualified. Otherwise, the symmetry of the angle-power value pattern is qualified.

8. The automotive millimeter wave radar antenna testing method according to claim 7, characterized in that: The method for judging whether the speed measurement accuracy of the millimeter-wave radar antenna of the vehicle to be tested is qualified comprises: Install the millimeter-wave radar antenna of the vehicle to be tested at the corresponding position of the test vehicle, control the test vehicle to drive at a constant speed in the closed road test site, and control the interference vehicle to km / h speed behind the test vehicle m at a constant speed, and the speed of the jammer vehicle and the distance between the test vehicle and the jammer vehicle are measured by the millimeter-wave radar antenna of the vehicle to be tested; Get the speed of the jammer vehicle measured by the millimeter-wave radar antenna of the vehicle to be tested and The absolute value of the difference between the test vehicle and the interference vehicle and The absolute value of the difference between the speed difference and the distance difference is set respectively. The absolute value of the difference between the test vehicle and the interference vehicle is greater than the absolute value threshold of the speed difference, or the distance between the test vehicle and the interference vehicle is greater than When the absolute value of the difference is greater than the distance difference absolute value threshold, the speed measurement accuracy of the millimeter-wave radar antenna of the vehicle to be tested is unqualified; When the measured speed of the jammer vehicle is The absolute value of the difference between the speed difference and the interference vehicle is less than or equal to the absolute value threshold of the speed difference, and the distance between the test vehicle and the interference vehicle is When the absolute value of the difference is less than or equal to the distance difference absolute value threshold, the interference vehicle is controlled from km / h to km / h, and obtain the start acceleration time and end acceleration time of the interference vehicle, and divide the time period from the start acceleration time to the end acceleration time into time points, and obtain the actual speed of the jammer vehicle corresponding to each time point and the speed of the jammer vehicle measured by the millimeter-wave radar antenna of the vehicle to be tested; According to the actual speed of the jammer car corresponding to each time point and the speed of the jammer car measured by the millimeter-wave radar antenna of the vehicle to be tested, the actual speed change curve of the jammer car and the test speed change curve of the jammer car are constructed respectively, and the speed measurement accuracy evaluation coefficient is obtained according to the actual speed change curve of the jammer car and the test speed change curve of the jammer car ; Set the speed measurement accuracy evaluation coefficient threshold ,when When the speed measurement accuracy of the millimeter wave radar antenna of the tested vehicle is not up to standard, When the speed measurement accuracy of the millimeter-wave radar antenna of the vehicle to be tested is qualified.

9. The automotive millimeter wave radar antenna testing method according to claim 8, characterized in that: The actual speed change curve of the jamming vehicle and the test speed change curve of the jamming vehicle are constructed respectively, and the speed measurement accuracy evaluation coefficient is obtained according to the actual speed change curve of the jamming vehicle and the test speed change curve of the jamming vehicle. The methods include: Create a blank coordinate system. Fill the time points into the abscissa of the blank coordinate system in sequence, set the ordinate of the blank coordinate system as speed, and fill the actual speed of the jammer vehicle corresponding to the time point into the blank coordinate system, draw a curve, and obtain a curve diagram of the actual speed change of the jammer vehicle; Create a new blank coordinate system. The time points are filled into the abscissa of the new blank coordinate system in sequence, the ordinate of the new blank coordinate system is set as the speed, and the speed of the jamming vehicle measured by the millimeter-wave radar antenna of the vehicle to be tested corresponding to the time point is filled into the new blank coordinate system, and a curve is drawn to obtain a test speed change curve of the jamming vehicle; The speed measurement accuracy evaluation coefficient is obtained based on the actual speed change curve of the jamming vehicle and the test speed change curve of the jamming vehicle. ; in, ; for The weight coefficient of for The weight coefficient of , , and They are the start acceleration time and the end acceleration time of the jammer vehicle, for arrive The actual speed change curve function of the jammer vehicle within the time period, for arrive The test speed change curve function of the jammer vehicle within the time period, represents the time independent variable, The speed of the jammer vehicle measured by the millimeter-wave radar antenna of the vehicle under test corresponding to the end acceleration time.

10. An automotive millimeter-wave radar antenna testing system, used to implement an automotive millimeter-wave radar antenna testing method according to any one of claims 1 to 9, characterized in that: include: Antenna installation assembly, responsible for installing the millimeter-wave radar antenna of the vehicle to be tested; The static test component is responsible for performing a static test on the installed automotive millimeter-wave radar antenna to be tested through a vector network analyzer to obtain the input reflection coefficient of the automotive millimeter-wave radar antenna to be tested, and judging whether the input reflection loss of the automotive millimeter-wave radar antenna to be tested is qualified through the input reflection coefficient; The far-field pattern test component is responsible for performing a far-field pattern test on the automotive millimeter-wave radar antenna to be tested with qualified input reflection loss to determine whether the far-field pattern test is qualified; The dynamic test component is responsible for dynamically testing the millimeter-wave radar antenna of the vehicle to be tested that has passed the far-field pattern test, and judging whether the speed measurement accuracy of the millimeter-wave radar antenna of the vehicle to be tested is qualified. If the speed measurement accuracy is qualified, the millimeter-wave radar antenna of the vehicle to be tested is qualified as a whole; if the speed measurement accuracy is unqualified, the millimeter-wave radar antenna of the vehicle to be tested is unqualified as a whole.

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