An automotive millimeter-wave radar antenna testing method and an antenna testing system

Abstract

The present invention belongs to the technical field of radar antenna testing. The present invention discloses a method for testing an automotive millimeter-wave radar antenna and an antenna testing system, including: installing the automotive millimeter-wave radar antenna to be tested; performing static testing on the installed automotive millimeter-wave radar antenna to be tested through a vector network analyzer to determine whether the static testing of the automotive millimeter-wave radar antenna to be tested is qualified; performing far-field pattern testing on the automotive millimeter-wave radar antenna to be tested with qualified static testing to determine whether the far-field pattern testing is qualified; performing dynamic testing on the automotive millimeter-wave radar antenna to be tested with qualified far-field pattern testing to determine whether the speed measurement accuracy of the automotive millimeter-wave radar antenna to be tested is qualified. If the speed measurement accuracy is qualified, the overall automotive millimeter-wave radar antenna to be tested is qualified; if the speed measurement accuracy is unqualified, the overall automotive millimeter-wave radar antenna to be tested is unqualified, further improving the accuracy of testing.

Description

Technical Field

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

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

[0003] However, in the process of analyzing the symmetry of the angle-power value pattern, the traditional method analyzes the symmetry of the angle-power value pattern by comparing the side lobes on the left and right sides. This method is not fine enough. In addition to the side lobes on the left and right sides, there are other curves that are not compared, thus reducing the accuracy of the symmetry analysis, and further reducing the testing accuracy and accuracy. When the vehicle behind changes from one speed to another, there are many ways of change, such as changing slowly all the time, changing directly and quickly, or changing quickly first and then slowly, etc. The difference between the speed change mode detected by the vehicle's radar and the actual speed change mode is too large, which may cause safety accidents and lead to car accidents such as rear-end collisions. Failing to take the difference between the speed change mode detected by the vehicle's radar and the actual speed change mode as a testing factor will result in a decrease in the testing accuracy and accuracy, so that the millimeter-wave radar antenna that fails the test is used, thus increasing the risk of car accidents such as rear-end collisions.

[0004] In view of this, the present invention proposes a method for testing an automotive millimeter-wave radar antenna and an 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 object, the present invention provides the following technical solution: A method for testing an automotive millimeter-wave radar antenna, comprising:

[0006] Step S1: Install the automotive millimeter-wave radar antenna to be tested;

[0007] Step S2: Perform static testing on the to-be-tested automotive millimeter-wave radar antenna after installation using a vector network analyzer to obtain the input reflection coefficient of the to-be-tested automotive millimeter-wave radar antenna, and determine whether the input reflection loss of the to-be-tested automotive millimeter-wave radar antenna is qualified based on the input reflection coefficient;

[0008] Step S3: Perform far-field pattern testing on the to-be-tested automotive millimeter-wave radar antenna with qualified input reflection loss to obtain the angle-power value pattern. By analyzing the angle-power value pattern, obtain the actual transmission coefficient, half-power beam width, main-to-side lobe difference coefficient, and symmetry difference value, and determine whether the far-field pattern testing is qualified based on the actual transmission coefficient, half-power beam width, main-to-side lobe difference coefficient, and symmetry difference value;

[0009] Step S4: Perform dynamic testing on the to-be-tested automotive millimeter-wave radar antenna with qualified far-field pattern testing to obtain the actual speed change curve of the interfering vehicle and the tested speed change curve of the interfering vehicle. By analyzing the actual speed change curve of the interfering vehicle and the tested speed change curve of the interfering vehicle, obtain the speed measurement accuracy evaluation coefficient, and determine whether the speed measurement accuracy of the to-be-tested automotive millimeter-wave radar antenna is qualified based on the speed measurement accuracy evaluation coefficient. If the speed measurement accuracy is qualified, the to-be-tested automotive millimeter-wave radar antenna is overall qualified; if the speed measurement accuracy is unqualified, the to-be-tested automotive millimeter-wave radar antenna is overall unqualified.

[0010] Further, the method for installing the to-be-tested automotive millimeter-wave radar antenna includes:

[0011] Fix the to-be-tested automotive millimeter-wave radar antenna on an electric turntable through a special bracket, and calculate the minimum far-field distance according to the operating frequency of the to-be-tested automotive millimeter-wave radar antenna ;

[0012] Wherein, ; is the size of the to-be-tested automotive millimeter-wave radar antenna, is the wavelength;

[0013] Obtain the test distance between the to-be-tested automotive millimeter-wave radar antenna and the receiving antenna according to the minimum far-field distance ;

[0014] Wherein, ; is the adjustment coefficient of the minimum far-field distance, and ;

[0015] Place the receiving antenna at a distance from the to-be-tested automotive millimeter-wave radar antenna at the same height horizontal plane where the receiving antenna and the millimeter-wave radar antenna of the vehicle to be tested are located, and 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 directly facing the receiving antenna.

[0016] Further, the method for obtaining the input reflection coefficient of the millimeter-wave radar antenna of the vehicle to be tested by static testing the installed millimeter-wave radar antenna of the vehicle to be tested with a vector network analyzer includes:

[0017] 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 sweep points through the vector network analyzer. After the setting is completed, test the millimeter-wave radar antenna of the vehicle to be tested through the vector network analyzer, 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 vector network analyzer for the millimeter-wave radar antenna of the vehicle to be tested.

[0018] Further, the method for determining whether the input reflection loss of the millimeter-wave radar antenna of the vehicle to be tested is qualified by the input reflection coefficient includes:

[0019] Set the input reflection coefficient threshold;

[0020] When the input reflection coefficient is less than the input reflection coefficient threshold, the input reflection loss of the millimeter-wave radar antenna of the vehicle 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 millimeter-wave radar antenna of the vehicle to be tested is unqualified.

[0021] Further, the method for obtaining the angle-power value pattern includes:

[0022] Connect the receiving antenna to the vector network analyzer, record the initial position of the millimeter-wave radar antenna of the vehicle to be tested as , and measure the forward transmission coefficient between the millimeter-wave radar antenna of the vehicle to be tested and the receiving antenna when the millimeter-wave radar antenna of the vehicle to be tested is through the vector network analyzer. Start the electric turntable to rotate the millimeter-wave radar antenna of the vehicle to be tested, and rotate it to the right by each time until it rotates to . Each time it rotates, obtain a forward transmission coefficient;

[0023] Rotate the millimeter-wave radar antenna of the vehicle to be tested back 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 it to the left by each time until it rotates to . Each time it rotates, obtain a forward transmission coefficient, and obtain the millimeter-wave radar antenna of the vehicle to be tested as 、 、 , ……, , , , ……, When it is , the forward transmission coefficient between the millimeter-wave radar antenna of the vehicle to be tested and the receiving antenna;

[0024] Establish a blank two-dimensional rectangular coordinate system, set the abscissa of the blank two-dimensional rectangular coordinate system as the angle, set the ordinate of the blank two-dimensional rectangular coordinate system as the forward transmission coefficient, and use the millimeter-wave radar antenna of the vehicle to be tested as , , , ……, , , , ……, When it is , fill the forward transmission coefficient between the millimeter-wave radar antenna of the vehicle to be tested and the receiving antenna into the blank two-dimensional rectangular coordinate system to obtain the forward transmission coefficient mapping points, and connect the forward transmission coefficient mapping points in sequence through a straight line in ascending order of the angle to obtain the angle-power value direction diagram.

[0025] Furthermore, the method for judging whether the far-field pattern test is qualified includes:

[0026] Perform a far-field pattern simulation test on the millimeter-wave radar antenna of the vehicle to be tested through electromagnetic simulation software to obtain the angle-power value simulation pattern, obtain the maximum forward transmission coefficient corresponding to the forward transmission coefficient mapping point in the angle-power value simulation pattern, and record it as the standard transmission coefficient;

[0027] Obtain the maximum forward transmission coefficient corresponding to the forward transmission coefficient mapping point in the angle-power value direction diagram, and record it as the actual transmission coefficient;

[0028] Subtract , is a positive integer, to obtain the first subtraction result. If the actual transmission coefficient is less than the first subtraction result, the far-field pattern test is unqualified;

[0029] If the actual transmission coefficient is greater than or equal to the first subtraction result, draw a parallel line to the vertical axis through the forward transmission coefficient mapping point corresponding to the maximum forward transmission coefficient. Denote the angle-power value direction diagram on the left side of the parallel line as the left half angle-power value direction diagram, and denote the angle-power value direction diagram on the right side of the parallel line as the right half angle-power value direction diagram. Subtract , , to obtain the second subtraction result;

[0030] 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 whose subtraction result is equal to the second subtraction result, and denote it as the right angle. Obtain the angle corresponding to the first forward transmission coefficient in the left half angle-power value pattern whose subtraction result is equal to the second subtraction result, and denote it as the left angle;

[0031] Subtract the left angle from the right angle to obtain the half-power beamwidth. Set the half-power beamwidth threshold range. If the half-power beamwidth exceeds the half-power beamwidth threshold range, the far-field pattern test fails;

[0032] If the half-power beamwidth does not exceed the half-power beamwidth threshold range, obtain the second largest forward transmission coefficient corresponding to the forward transmission coefficient mapping point in the angle-power value pattern, and denote it as the second transmission coefficient;

[0033] 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. If the main side lobe difference coefficient is greater than the main side lobe difference coefficient threshold, the far-field pattern test fails;

[0034] If the main side lobe difference coefficient is less than or equal to the main side lobe difference coefficient threshold, obtain the symmetry difference between the left half angle-power value pattern and the right half angle-power value pattern, and perform symmetry analysis on the angle-power value pattern according to the symmetry difference;

[0035] If the symmetry of the angle-power value pattern is unqualified, the far-field pattern test fails. If the symmetry of the angle-power value pattern is qualified, the far-field pattern test is qualified.

[0036] Further, the method for performing symmetry analysis on the angle-power value pattern includes:

[0037] Subtract the forward transmission coefficient corresponding to the angle of 1° from the forward transmission coefficient corresponding to the angle of Perform an absolute value operation on the subtraction result. Subtract the forward transmission coefficient corresponding to the angle of from the forward transmission coefficient corresponding to the angle of Perform an absolute value operation on the subtraction result, and so on. Subtract the forward transmission coefficient corresponding to the angle of from the forward transmission coefficient corresponding to the angle of Perform an absolute value operation on the subtraction result, and add up all the absolute value operation results to obtain the symmetry difference between the left half angle-power value pattern and the right half angle-power value pattern;

[0038] Set a 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.

[0039] Further, the method for determining whether the speed measurement accuracy of the millimeter-wave radar antenna of the vehicle to be tested is qualified includes:

[0040] 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 travel at a constant speed on the closed road test site, and control the interfering vehicle to travel at a km / h speed uniformly behind the test vehicle at a distance of m, and measure the speed of the interfering vehicle and the distance between the test vehicle and the interfering vehicle through the millimeter-wave radar antenna of the vehicle to be tested.

[0041] Obtain the absolute value of the difference between the speed of the interfering vehicle measured by the millimeter-wave radar antenna of the vehicle to be tested and , and the absolute value of the difference between the distance between the test vehicle and the interfering vehicle and , and respectively set an absolute value threshold for the speed difference and an absolute value threshold for the distance difference. When the absolute value of the difference between the measured speed of the interfering vehicle and is greater than the absolute value threshold for the speed difference, or the absolute value of the difference between the measured distance between the test vehicle and the interfering vehicle and is greater than the absolute value threshold for the distance difference, the speed measurement accuracy of the millimeter-wave radar antenna of the vehicle to be tested is unqualified;

[0042] When the absolute value of the difference between the measured speed of the interfering vehicle and is less than or equal to the absolute value threshold for the speed difference, and the absolute value of the difference between the measured distance between the test vehicle and the interfering vehicle and is less than or equal to the absolute value threshold for the distance difference, control the interfering vehicle to accelerate from km / h to km / h, and obtain the start acceleration time and the end acceleration time of the interfering vehicle. Divide the time period from the start acceleration time to the end acceleration time evenly into time points, and obtain the actual speed of the interfering vehicle and the speed of the interfering vehicle measured by the millimeter-wave radar antenna of the vehicle to be tested corresponding to each time point;

[0043] According to the actual speed of the interfering vehicle and the speed of the interfering vehicle measured by the millimeter-wave radar antenna of the vehicle to be tested corresponding to each time point, respectively construct an actual speed change curve graph of the interfering vehicle and a test speed change curve graph of the interfering vehicle, and obtain a speed measurement accuracy evaluation coefficient ;

[0044] Set a speed measurement accuracy evaluation coefficient threshold , when , the speed measurement accuracy of the millimeter-wave radar antenna of the vehicle to be tested is unqualified. When , the speed measurement accuracy of the millimeter-wave radar antenna of the vehicle to be tested is qualified.

[0045] Furthermore, the method of respectively constructing the actual speed change curve graph of the interfering vehicle and the measured speed change curve graph of the interfering vehicle, and obtaining the speed measurement accuracy evaluation coefficient includes:

[0046] Establish a blank coordinate system, and sequentially fill time points into the abscissa of the blank coordinate system. Set the ordinate of the blank coordinate system as speed, and fill the actual speed of the interfering vehicle corresponding to the time point into the blank coordinate system, draw a curve, and obtain the actual speed change curve graph of the interfering vehicle;

[0047] Establish a new blank coordinate system, and sequentially fill time points into the abscissa of the new blank coordinate system. Set the ordinate of the new blank coordinate system as speed, and fill the speed of the interfering vehicle measured by the millimeter-wave radar antenna of the vehicle to be tested corresponding to the time point into the new blank coordinate system, draw a curve, and obtain the measured speed change curve graph of the interfering vehicle;

[0048] Obtain the speed measurement accuracy evaluation coefficient according to the actual speed change curve graph of the interfering vehicle and the measured speed change curve graph of the interfering vehicle;

[0049] Among them, ; is 's weight coefficient, is 's weight coefficient, and , , and are respectively the start acceleration time and the end acceleration time of the interfering vehicle, is to the actual speed change curve function of the interfering vehicle within the time period, is to the measured speed change curve function of the interfering vehicle within the time period, represents the time independent variable, is the speed of the interfering vehicle measured by the millimeter-wave radar antenna of the vehicle to be tested corresponding to the end acceleration time.

[0050] An automotive millimeter-wave radar antenna test system, comprising:

[0051] An antenna installation component, responsible for installing the millimeter-wave radar antenna of the vehicle to be tested;

[0052] A static test component, responsible for statically testing the installed millimeter-wave radar antenna of the vehicle to be tested through a vector network analyzer, obtaining the input reflection coefficient of the millimeter-wave radar antenna of the vehicle to be tested, and judging whether the input reflection loss of the millimeter-wave radar antenna of the vehicle to be tested is qualified through the input reflection coefficient;

[0053] A far-field pattern test component, responsible for performing a far-field pattern test on the millimeter-wave radar antenna of the vehicle to be tested with qualified input reflection loss, and judging whether the far-field pattern test is qualified;

[0054] A dynamic test component, responsible for dynamically testing the millimeter-wave radar antenna of the vehicle to be tested with qualified far-field pattern test, 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.

[0055] The technical effects and advantages of a method for testing a millimeter-wave radar antenna of a vehicle and an antenna test system according to the present invention:

[0056] 1. By judging whether the input reflection loss of the millimeter-wave radar antenna of the vehicle to be tested is qualified through the input reflection coefficient, it is ensured that the millimeter-wave radar antenna of the vehicle to be tested with unqualified input reflection loss is not used, thereby reducing the probability of car accidents due to quality problems of automotive radars;

[0057] 2. Judging whether the far-field pattern test is qualified based on the actual transmission coefficient, half-power beam width, main-to-side lobe difference coefficient, and symmetry difference value. During the symmetry analysis of the angle-power value pattern, the symmetry of the angle-power value pattern is judged by comparing the forward transmission coefficients corresponding to all angles on the left and right sides, thereby increasing the accuracy of judging the symmetry of the angle-power value pattern, and further increasing the test accuracy and accuracy;

[0058] 3. Judging whether the speed measurement accuracy of the millimeter-wave radar antenna of the vehicle to be tested is 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 judging whether the speed measurement accuracy is qualified, thereby increasing the test accuracy and accuracy, and avoiding the use of millimeter-wave radar antennas that have not passed the test, thereby reducing the risk of car accidents such as rear-end collisions. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 It is a schematic diagram of a method for testing a millimeter-wave radar antenna of a vehicle according to the present invention;

[0060] Figure 2 Schematic diagram of a millimeter-wave radar antenna test system for an automobile according to the present invention;

[0061] Figure 3 Flow chart for judging whether the far-field pattern test is qualified according to the present invention. Specific embodiments

[0062] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0063] Embodiment 1, please refer to Figure 1 and Figure 3 As shown, a method for testing a millimeter-wave radar antenna for an automobile in this embodiment includes:

[0064] Step S1: Install the millimeter-wave radar antenna for the automobile to be tested;

[0065] Step S2: Perform a static test on the installed millimeter-wave radar antenna for the automobile to be tested through a vector network analyzer to obtain the input reflection coefficient of the millimeter-wave radar antenna for the automobile to be tested, and judge whether the input reflection loss of the millimeter-wave radar antenna for the automobile to be tested is qualified through the input reflection coefficient;

[0066] Step S3: Perform a far-field pattern test on the millimeter-wave radar antenna for the automobile to be tested with qualified input reflection loss to obtain an angle-power value pattern, analyze the angle-power value pattern to obtain the actual transmission coefficient, half-power beam width, main-to-side lobe difference coefficient, and symmetry difference value, and judge whether the far-field pattern test is qualified based on the actual transmission coefficient, half-power beam width, main-to-side lobe difference coefficient, and symmetry difference value;

[0067] Step S4: Perform a dynamic test on the millimeter-wave radar antenna for the automobile to be tested with a qualified far-field pattern test to obtain an actual speed change curve graph of the interfering vehicle and a test speed change curve graph of the interfering vehicle. Analyze the actual speed change curve graph of the interfering vehicle and the test speed change curve graph of the interfering vehicle to obtain a speed measurement accuracy evaluation coefficient, and judge whether the speed measurement accuracy of the millimeter-wave radar antenna for the automobile to be tested is qualified based on the speed measurement accuracy evaluation coefficient. If the speed measurement accuracy is qualified, the millimeter-wave radar antenna for the automobile to be tested is qualified as a whole. If the speed measurement accuracy is unqualified, the millimeter-wave radar antenna for the automobile to be tested is unqualified as a whole.

[0068] The process of installing the millimeter-wave radar antenna for the automobile to be tested includes:

[0069] Fix the millimeter-wave radar antenna of the vehicle to be tested on the electric turntable 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. ;

[0070] Among them, ; is the size of the millimeter-wave radar antenna of the vehicle to be tested, is the wavelength;

[0071] Among them, ; is the speed of light, is the operating frequency of the millimeter-wave radar antenna of the vehicle to be tested;

[0072] Obtain the test distance between the millimeter-wave radar antenna of the vehicle to be tested and the receiving antenna according to the minimum far-field distance ;

[0073] Among them, ; is the adjustment coefficient of the minimum far-field distance, and , the adjustment coefficient of the minimum far-field distance can be set through experimental data analysis or experience;

[0074] Place the receiving antenna at a distance of from the millimeter-wave radar antenna of the vehicle to be tested, and the receiving antenna and the millimeter-wave radar antenna of the vehicle to be tested are on the same horizontal plane. 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 directly facing the receiving antenna.

[0075] The process of obtaining the input reflection coefficient of the millimeter-wave radar antenna of the vehicle to be tested through static testing by a vector network analyzer includes:

[0076] 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 sweep points through the vector network analyzer. After setting, test the millimeter-wave radar antenna of the vehicle to be tested through the vector network analyzer. Obtain the input reflection coefficient of the millimeter-wave radar antenna of the vehicle to be tested by reading the test results of the vector network analyzer for the millimeter-wave radar antenna of the vehicle to be tested;

[0077] The process of judging whether the input reflection loss of the millimeter-wave radar antenna of the vehicle to be tested is qualified through the input reflection coefficient includes:

[0078] Set the input reflection coefficient threshold, and the input reflection coefficient threshold can be set through experimental data analysis or experience;

[0079] 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.

[0080] It should be noted that when the input reflection loss is unqualified, the entire automotive millimeter-wave radar antenna to be tested is unqualified.

[0081] It should be noted that the input reflection coefficient represents the return loss, that is, how much energy is reflected back to the transmitting end. The smaller the input reflection coefficient, the less energy is reflected back to the transmitting end, the smaller the input reflection loss, and the better the performance of the antenna.

[0082] For the automotive millimeter-wave radar antenna to be tested with qualified input reflection loss, the process of obtaining the angle-power value pattern in the far-field pattern test includes:

[0083] Connect the receiving antenna to the vector network analyzer, and record the initial position of the automotive millimeter-wave radar antenna to be tested as , and measure the forward transmission coefficient between the automotive millimeter-wave radar antenna to be tested and the receiving antenna through the vector network analyzer when the automotive millimeter-wave radar antenna to be tested is . Start the electric turntable to rotate the automotive millimeter-wave radar antenna to be tested, and rotate it to the right by each time until it rotates to . Each time it rotates, obtain the forward transmission coefficient between the automotive millimeter-wave radar antenna to be tested and the receiving antenna. Rotate the automotive millimeter-wave radar antenna to be tested back to the initial position through the electric turntable, and control the electric turntable to rotate the automotive millimeter-wave radar antenna to be tested, and rotate it to the left by each time until it rotates to . Each time it rotates, obtain the forward transmission coefficient between the automotive millimeter-wave radar antenna to be tested and the receiving antenna, so as to obtain the forward transmission coefficients between the automotive millimeter-wave radar antenna to be tested and the receiving antenna when the automotive millimeter-wave radar antenna to be tested is 、 、 、……、 、 、 、……、 .

[0084] It should be noted 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 and indirectly represents the power of the signal received by the receiving antenna.

[0085] Establish a blank two-dimensional rectangular coordinate system, set the abscissa of the blank two-dimensional rectangular coordinate system as the angle, set the ordinate of the blank two-dimensional rectangular coordinate system as the forward transmission coefficient, and use the millimeter-wave radar antenna of the vehicle to be tested as , , ……, , , ……, When the forward transmission coefficients between the millimeter-wave radar antenna of the vehicle to be tested and the receiving antenna are filled into the blank two-dimensional rectangular coordinate system, forward transmission coefficient mapping points are obtained. The forward transmission coefficient mapping points are connected in sequence by a straight line in ascending order of angles to obtain an angle-power value pattern;

[0086] The process of judging whether the far-field pattern test is qualified by analyzing the angle-power value pattern includes:

[0087] Perform a far-field pattern simulation test on the millimeter-wave radar antenna of the vehicle to be tested through electromagnetic simulation software to obtain an angle-power value simulation pattern. Obtain the maximum forward transmission coefficient corresponding to the forward transmission coefficient mapping point in the angle-power value simulation pattern and record it as the standard transmission coefficient;

[0088] 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;

[0089] Subtract , is a positive integer, The value of can be set through experimental data analysis or experience, and The value of is generally 2. Obtain the first subtraction result. If the actual transmission coefficient is less than the first subtraction result, the far-field pattern test is unqualified;

[0090] It should be noted that if the maximum forward transmission coefficient is on the low side, the feeder loss of the millimeter-wave radar antenna of the vehicle to be tested is abnormal. Therefore, the maximum forward transmission coefficient is used as a test factor;

[0091] If the actual transmission coefficient is greater than or equal to the first subtraction result, draw a parallel line to the vertical axis through the forward transmission coefficient mapping point corresponding to the maximum forward transmission coefficient. Denote the angle-power value pattern on the left side of the parallel line as the left half angle-power value pattern, and denote the angle-power value pattern on the right side of the parallel line as the right half angle-power value pattern. Subtract , , 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 denote 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 equal to the second subtraction result in the left half angle-power value pattern, and denote it as the left angle;

[0092] Subtract the left angle from the right angle to obtain the half-power beamwidth. Set the half-power beamwidth threshold range, which can be set through experimental data analysis or experience. If the half-power beamwidth exceeds the half-power beamwidth threshold range, the far-field pattern test fails;

[0093] It should be explained that if the half-power beamwidth is too large, problems such as beam spreading and poor directivity may occur. If the half-power beamwidth is too small, problems such as too strong directivity and affecting the coverage area may occur. Therefore, the half-power beamwidth is used as a test factor;

[0094] If the half-power beamwidth does not exceed the half-power beamwidth threshold range, obtain the second largest forward transmission coefficient corresponding to the forward transmission coefficient mapping point in the angle-power value pattern, and denote it as the second transmission coefficient;

[0095] Subtract the actual transmission coefficient from the second transmission coefficient to obtain the main-to-side lobe difference coefficient. Set the main-to-side lobe difference coefficient threshold, which can be set through experimental data analysis or experience. If the main-to-side lobe difference coefficient is greater than the main-to-side lobe difference coefficient threshold, the far-field pattern test fails;

[0096] It should be explained that if the difference between the main and side lobes is too large, that is, the side lobe is too high, problems such as the generation of interference echoes and radar false triggering and misjudgment may occur. Therefore, the difference between the main and side lobes is used as a test factor;

[0097] If the main-to-side lobe difference coefficient is less than or equal to the main-to-side lobe difference coefficient threshold, obtain the symmetry difference between the left half angle-power value pattern and the right half angle-power value pattern, and perform symmetry analysis on the angle-power value pattern according to the symmetry difference;

[0098] The process of obtaining the symmetry difference between the left half angle-power value pattern and the right half angle-power value pattern and performing symmetry analysis on the angle-power value pattern according to the symmetry difference includes:

[0099] Subtract the forward transmission coefficient corresponding to the angle of 1° from the forward transmission coefficient corresponding to the angle of Perform an absolute value operation on the subtraction result. Subtract the forward transmission coefficient corresponding to the angle of corresponding to the forward transmission coefficient corresponding to the angle of The corresponding forward transmission coefficient, take the absolute value operation on the subtraction result, and for the angle of subtract the corresponding forward transmission coefficient from the angle of the corresponding forward transmission coefficient, take the absolute value operation on the subtraction result, and so on. For the angle of subtract the corresponding forward transmission coefficient from the angle of the corresponding forward transmission coefficient, take the absolute value operation on the subtraction result, and add up all the absolute value operation results to obtain the symmetry difference between the left half angle-power value pattern and the right half angle-power value pattern;

[0100] It should be noted that during the installation of 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 directly facing the receiving antenna. Therefore, the angle corresponding to the maximum forward transmission coefficient is ;

[0101] Set a symmetry difference threshold, which 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;

[0102] It should be noted that when the far-field pattern test is unqualified, the entire millimeter-wave radar antenna of the vehicle to be tested is unqualified;

[0103] It should be noted that if the symmetry of the angle-power value pattern is poor, it may be due to unbalanced feeder or poor performance of radar components. Therefore, the symmetry of the angle-power value pattern is used as a test factor;

[0104] It should be noted that the traditional method analyzes the symmetry of 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 symmetric, and cannot determine whether the rest of the left and right sides are symmetric. It is not fine enough, resulting in misjudgment of the symmetry of the angle-power value pattern, and thus reducing the test accuracy and accuracy. However, the present invention determines 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 determines whether all parts on the left and right sides are symmetric, thereby increasing the accuracy of judging whether the symmetry of the angle-power value pattern is qualified, and further increasing the test accuracy and accuracy.

[0105] Performing dynamic testing on the automotive millimeter-wave radar antenna to be tested that has passed the far-field pattern test, and the process of determining whether the speed measurement accuracy of the automotive millimeter-wave radar antenna to be tested is qualified includes:

[0106] Install the automotive millimeter-wave radar antenna to be tested at the corresponding position of the test vehicle, control the test vehicle to drive uniformly on the closed road test site, and control the interference vehicle to drive uniformly at a speed of km / h behind the test vehicle at a distance of m, and measure the speed of the interference vehicle and the distance between the test vehicle and the interference vehicle through the automotive millimeter-wave radar antenna to be tested;

[0107] Obtain the absolute value of the difference between the speed of the interference vehicle measured by the automotive millimeter-wave radar antenna to be tested and , and the absolute value of the difference between the distance between the test vehicle and the interference vehicle and . And respectively set the absolute value threshold of the speed difference and the absolute value threshold of the distance difference. The absolute value threshold of the speed difference and the absolute value threshold of the distance difference can be set through experimental data analysis or experience. When the absolute value of the difference between the measured speed of the interference vehicle and is greater than the absolute value threshold of the speed difference, or the absolute value of the difference between the measured distance between the test vehicle and the interference vehicle and is greater than the absolute value threshold of the distance difference, the speed measurement accuracy of the automotive millimeter-wave radar antenna to be tested is unqualified;

[0108] When the absolute value of the difference between the measured speed of the interference vehicle and is less than or equal to the absolute value threshold of the speed difference, and the absolute value of the difference between the measured distance between the test vehicle and the interference vehicle and is less than or equal to the absolute value threshold of the distance difference, control the interference vehicle to accelerate from km / h to km / h, and obtain the start acceleration time and the end acceleration time of the interference vehicle. Divide the time period from the start acceleration time to the end acceleration time evenly into time points, and obtain the actual speed of the interference vehicle corresponding to each time point;

[0109] Establish 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 the speed, and fill the actual speed of the interference vehicle corresponding to the time point into the blank coordinate system, draw a curve, and obtain the actual speed change curve graph of the interference vehicle;

[0110] Obtain the speed of the interference vehicle measured by the automotive millimeter-wave radar antenna to be tested corresponding to each time point;

[0111] Establish a blank coordinate system, and fill the 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 speed of the interfering vehicle measured by the millimeter-wave radar antenna of the vehicle to be tested corresponding to the time points into the blank coordinate system, then draw a curve to obtain the curve graph of the speed change of the interfering vehicle during the test;

[0112] Obtain the speed measurement accuracy evaluation coefficient according to the actual speed change curve graph of the interfering vehicle and the curve graph of the speed change of the interfering vehicle during the test ;

[0113] Wherein, ; is 's weight coefficient, is 's weight coefficient, and , , and are respectively the starting acceleration time and the ending acceleration time of the interfering vehicle, is to the function of the actual speed change curve of the interfering vehicle within the time period, is to the function of the speed change curve of the interfering vehicle during the test within the time period, represents the time independent variable, is the speed of the interfering vehicle measured by the millimeter-wave radar antenna of the vehicle to be tested corresponding to the ending acceleration time;

[0114] It should be noted that the function of the actual speed change curve of the interfering vehicle is the curve function in the actual speed change curve graph of the interfering vehicle, and the function of the speed change curve of the interfering vehicle during the test is the curve function in the curve graph of the speed change of the interfering vehicle during the test;

[0115] Set the threshold of the speed measurement accuracy evaluation coefficient , when , the speed measurement accuracy of the millimeter-wave radar antenna of the vehicle to be tested is unqualified, and when , the speed measurement accuracy of the millimeter-wave radar antenna of the vehicle to be tested is qualified;

[0116] It should be noted that when the vehicle behind the vehicle changes from one speed to another, there are many ways of change, such as always changing slowly or directly changing quickly or changing quickly first and then slowly, etc. If the difference between the speed change mode detected by the vehicle's radar and the actual speed change mode is too large, it may cause safety accidents and lead to traffic accidents such as rear-end collisions. Therefore, the present invention takes the difference between the speed change mode detected by the vehicle's radar and the actual speed change mode as a test factor, for to Integrate the actual speed change curve function of the interfering vehicle within the time period to obtain the curve area enclosed by the actual speed change curve of the interfering vehicle and the coordinate axes. The curve area enclosed by the actual speed change curve of the interfering vehicle and the coordinate axes represents the actual speed change mode. For to Integrate the test speed change curve function of the interfering vehicle within the time period to obtain the curve area enclosed by the test speed change curve of the interfering vehicle and the coordinate axes. The curve area enclosed by the test speed change curve of the interfering vehicle and the coordinate axes represents the speed change mode detected by the automotive radar. The absolute value of the difference between the two curve areas represents the difference between the speed change mode detected by the automotive radar and the actual speed change mode. At the end of acceleration, the larger the absolute value of the difference between the speed of the interfering vehicle detected by the automotive radar and the actual speed of the interfering vehicle, the worse the performance of the speed detected by the automotive radar and the higher the delay. Therefore, at the end of acceleration, the absolute value of the difference between the speed of the interfering vehicle detected by the automotive radar and the actual speed of the interfering vehicle is also used as a test factor. Combine the difference between the speed change mode detected by the automotive radar and the actual speed change mode with the absolute value of the difference between the speed of the interfering vehicle detected by the automotive radar and the actual speed of the interfering vehicle at the end of acceleration to obtain a speed measurement accuracy evaluation coefficient. Judge whether the speed measurement accuracy of the millimeter-wave radar antenna of the vehicle to be tested is qualified through the speed measurement accuracy evaluation coefficient, thereby increasing the accuracy and precision of the test, ensuring that the millimeter-wave radar antenna that fails the test is not used, and thus reducing the risk of accidents such as rear-end collisions.

[0117] In this embodiment, by inputting the reflection coefficient, it is judged whether the input reflection loss of the millimeter-wave radar antenna of the vehicle to be tested is qualified, thereby ensuring that the millimeter-wave radar antenna of the vehicle to be tested with unqualified input reflection loss is not used, and further reducing the probability of accidents caused by the quality problem of the automotive radar; according to the actual transmission coefficient, half-power beam width, main-to-side lobe difference coefficient, and symmetry difference value, it is judged whether the far-field pattern test is qualified. During the symmetry analysis of the angle-power value pattern, by comparing the forward transmission coefficients corresponding to all angles on the left and right sides, it is judged whether the symmetry of the angle-power value pattern is qualified, thereby increasing the accuracy of judging whether the symmetry of the angle-power value pattern is qualified, and further increasing the test accuracy and precision; by the difference between the speed change mode detected by the automotive radar and the actual speed change mode, it is judged whether the speed measurement accuracy of the millimeter-wave radar antenna of the vehicle to be tested is qualified, further increasing the accuracy of judging whether the speed measurement accuracy is qualified, thereby increasing the test accuracy and precision, and avoiding the use of the millimeter-wave radar antenna that fails the test, thus reducing the risk of accidents such as rear-end collisions.

[0118] Embodiment 2, please refer to Figure 2As shown, for the parts not described in detail in this embodiment, refer to the description of Embodiment 1. A vehicle millimeter-wave radar antenna test system is provided, including:

[0119] An antenna installation component responsible for installing the vehicle millimeter-wave radar antenna to be tested;

[0120] A static test component responsible for statically testing the installed vehicle millimeter-wave radar antenna to be tested through a vector network analyzer, obtaining the input reflection coefficient of the vehicle millimeter-wave radar antenna to be tested, and judging whether the input reflection loss of the vehicle millimeter-wave radar antenna to be tested is qualified based on the input reflection coefficient;

[0121] A far-field pattern test component responsible for performing a far-field pattern test on the vehicle millimeter-wave radar antenna to be tested with qualified input reflection loss, and judging whether the far-field pattern test is qualified;

[0122] A dynamic test component responsible for dynamically testing the vehicle millimeter-wave radar antenna to be tested with qualified far-field pattern test, and judging whether the speed measurement accuracy of the vehicle millimeter-wave radar antenna to be tested is qualified. If the speed measurement accuracy is qualified, the vehicle millimeter-wave radar antenna to be tested is considered qualified as a whole. If the speed measurement accuracy is unqualified, the vehicle millimeter-wave radar antenna to be tested is considered unqualified as a whole.

[0123] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed in the present invention can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0124] In 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 merely illustrative. For example, the division of the units is only one type, and there can be other division methods in actual implementation. For example, 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 displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces, and the indirect couplings or communication connections of devices or units can be in electrical, mechanical, or other forms.

[0125] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered by the protection scope of the present invention.

[0126] Finally, the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within 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 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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