A method for detecting the phase center of the feed source of a Beidou navigation antenna and communication antenna

Abstract

This invention discloses a method for detecting the phase center of a Beidou navigation antenna and communication antenna feed, belonging to the field of satellite navigation and communication technology. Specifically, it includes the following steps: S1, connecting the transmitting antenna, transmitting turntable, vector network analyzer, computer, printer, antenna turntable, and antenna under test in a microwave anechoic chamber; S2, adjusting the antenna under test and the transmitting antenna using a laser beam to ensure consistent measurement standards. The microwave anechoic chamber is covered on all six sides with shielding and absorbing materials, effectively isolating external electromagnetic interference and creating a reflection-free, low-interference testing environment. This avoids distortion of phase measurement data due to external electromagnetic signal coupling, ensuring that the test results accurately reflect the antenna's inherent characteristics. Strict limits are imposed on parameters such as the quiet zone size, humidity, temperature, and atmospheric pressure of the microwave anechoic chamber to reduce the impact of slowly changing environmental factors such as temperature and humidity on the antenna's electrical performance, ensuring consistent testing conditions.

Description

Technical Field

[0001] This invention relates to the field of satellite navigation and communication technology, and in particular to a method for detecting the phase center of the feed source of a Beidou navigation antenna and communication antenna. Background Technology

[0002] The antenna phase center refers to the center of the equivalent spherical wave source during electromagnetic wave radiation or reception. Observations obtained through high-precision satellite navigation measurements are based on the antenna phase center, and its position directly affects the symmetry of the antenna's radiation pattern and signal transmission efficiency. The feed phase center should coincide with the focal point of the antenna's geometric reflector to eliminate signal distortion and gain loss. Phase center offset leads to beam pointing deviation, decreased polarization purity, and increased sidelobe levels, significantly reducing communication link stability. In positioning measurements, when measuring antenna height, the antenna reference point is used as the reference. The antenna phase center is a key parameter affecting the accuracy of navigation and communication signal transmission. Accurately determining the position of the antenna phase center can improve the accuracy and reliability of measurements. Existing detection methods suffer from environmental interference affecting detection stability and results. Summary of the Invention

[0003] Purpose of the invention: The purpose of this invention is to provide a method for detecting the phase center of the feed source of Beidou navigation antennas and communication antennas; it can solve the problem of the stability and results of detection being affected by environmental interference in existing detection methods.

[0004] Technical Solution: To solve the above-mentioned technical problems, according to one aspect of the present invention, more specifically, a method for detecting the phase center of a feed pylon for a BeiDou navigation antenna and communication antenna, specifically including the following steps:

[0005] S1. Connect the transmitting antenna, transmitting turntable, vector network analyzer, computer, printer, antenna turntable and antenna under test in the microwave anechoic chamber;

[0006] S2. Use a laser beam to adjust the antenna under test and the transmitting antenna to ensure that the measurement reference is consistent;

[0007] S3. Use automatic testing software on the computer to set the test frequency, transmission level, antenna polarization, turntable speed, rotation angle, and real-time display format;

[0008] S4. Define the 0°, +90°, and -90° displayed on the antenna turntable display device;

[0009] S5. Use the antenna test software to set the vector network analyzer to phase measurement, and control the antenna turntable to rotate from -90° to +90° clockwise.

[0010] S6. Based on the shape of the phase test curve displayed on the computer screen, determine the adjustment direction and distance of the antenna under test, and adjust it until the phase curve reaches the ideal state.

[0011] S7. Collect relevant operational data on the direction and distance adjustment by different operators using the same microwave anechoic chamber. After preprocessing and analyzing the collected data, obtain the comprehensive operation feedback index. Based on the comprehensive operation feedback index, determine whether to continue operation or to repair the testing equipment.

[0012] S8. Rotate the antenna under test 90° around its polarization axis and repeat steps S4 to S6. The point where the antenna under test coincides with the rotation center of the antenna turntable is the phase center of the antenna under test.

[0013] S9. The antenna test software automatically displays the distance of the antenna under test from the phase center, and calculates the specific location of the phase center of the antenna under test in the wireless geometry based on the distance of the three displayed components.

[0014] Furthermore, in step S1, the microwave anechoic chamber is covered with shielding and absorbing materials on all six sides. Its quiet zone is no less than 0.5m × 0.5m × 0.5m, with humidity of 45%–75%, temperature of 15℃–35℃, and atmospheric pressure of 86.0kPa–101.30kPa. It is free from electromagnetic interference and meets the far-field conditions. ,

[0015] Where R is the distance between the antenna under test and the transmitting antenna, D is the maximum size of the antenna under test, and d is the maximum size of the transmitting antenna. Wavelength;

[0016] Vector network analyzer accuracy requirements: amplitude ≤ 0.5dB, phase ≤ 3°;

[0017] The antenna turntable is a five-axis turntable with a display resolution of 0.01°, position accuracy of 0.1° for both elevation and vertical, rotation speed of 1° / s to 10° / s for azimuth and 1° / s to 4° / s for elevation, and X / Y displacement accuracy of 0.1mm and resolution of 0.01mm.

[0018] Launch turntable: 360° azimuth rotation and vertical movement;

[0019] Transmitting antenna: Key parameters have been calibrated in the laboratory and come with a calibration certificate.

[0020] Furthermore, the specific operation steps of step S2 are as follows:

[0021] S21. Match the polarization of the transmitting antenna with the polarization of the antenna under test;

[0022] S22. Preheat all equipment;

[0023] S23. Mount the antenna under test on the antenna turntable, with the geometric center of the antenna under test coinciding with the rotation center of the antenna turntable. The transmitting antenna and the antenna under test are at the same height and aligned axially. Use the laser beam as a reference straight line. Detect the offset of the target position through the emission, transmission or interference of the laser beam. Align the laser beam with the equipment coordinate system to ensure that the measurement reference is consistent.

[0024] Furthermore, in S4, when the transmitting antenna and the antenna under test are axially aligned, the antenna turntable display device displays 0°. Rotating the antenna turntable 90° clockwise from 0° is defined as +90°, and rotating the antenna turntable 90° counterclockwise from 0° is defined as -90°.

[0025] Furthermore, step S7 includes the following specific steps:

[0026] S71. Collect relevant operation data on the adjustment of direction and distance by different operators using the same microwave anechoic chamber to obtain the first data, including: the adjustment time for each operation in this microwave anechoic chamber, and the number of adjustments made by each operator in this microwave anechoic chamber.

[0027] S72. The second data is obtained by removing the relevant operation data that was not adjusted to the ideal state of the phase curve from the first data, including: the adjustment time for each operator to adjust to the ideal state of the phase curve in this microwave anechoic chamber each time, and the number of times each operator adjusts to the ideal state of the phase curve in this microwave anechoic chamber each time.

[0028] S73. Analyze and process the second data of each operator to obtain the current operation feedback index of each operator in this microwave anechoic chamber. If the increase of the current operation feedback index compared with the average value of the previous operation feedback index of the operator in this microwave anechoic chamber is lower than the upper limit of the increase of the operation feedback index, continue the detection. Otherwise, suspend the phase center detection, carry out the inspection equipment maintenance, and resume the detection after the inspection equipment is completely normal.

[0029] S74. Process the most recent operation feedback index of each operator in this microwave anechoic chamber to obtain the comprehensive operation feedback index. When the comprehensive operation feedback index is lower than the comprehensive operation feedback index threshold, continue the detection. Otherwise, suspend the phase center detection, perform equipment maintenance, and resume detection after the equipment is fully normal.

[0030] Furthermore, in step S73, when analyzing and processing the second data of each operator to obtain the operation feedback index for each operator:

[0031] ,

[0032] in, The operational feedback index for each operator in this microwave anechoic chamber. This refers to the adjustment time taken by the operator in this microwave anechoic chamber to bring the phase curve to an ideal state. Let DN be the adjustment time taken by the operator each time to adjust the phase curve to the ideal state in this microwave anechoic chamber, n be the number of times the operator adjusts the phase curve to the ideal state in this microwave anechoic chamber, and DN be the number of adjustments made by the operator in this particular microwave anechoic chamber to achieve the ideal phase curve. This refers to the minimum number of adjustments required for the operator to bring the phase curve to an ideal state in this microwave anechoic chamber. This refers to the maximum number of adjustments the operator makes in this microwave anechoic chamber until the phase curve reaches the ideal state.

[0033] Furthermore, in step S73, the upper limit of the increase of the operation feedback index is set and adjusted according to the needs of the actual operation process.

[0034] Furthermore, in step S74, when obtaining the comprehensive operation feedback index by processing the most recent operation feedback index of each operator in this microwave anechoic chamber:

[0035] ,

[0036] in, As a comprehensive operational feedback index, Each operator adjusts the phase curve to the ideal state in this microwave anechoic chamber a certain number of times. This refers to the number of times all operators adjust the phase curve in this microwave anechoic chamber until it reaches the ideal state. The most recent operation feedback index for each operator.

[0037] Furthermore, in step S74, the comprehensive operation feedback index threshold is set and adjusted according to the needs of the actual operation process. Beneficial effects

[0038] 1. The microwave anechoic chamber is covered with shielding and absorbing materials on all six sides, which can effectively isolate external electromagnetic interference, create a non-reflective and low-interference testing environment, avoid distortion of phase measurement data caused by external electromagnetic signal coupling, and ensure that the test results truly reflect the characteristics of the antenna itself. The quiet zone size, humidity, temperature, atmospheric pressure and other parameters of the microwave anechoic chamber are strictly limited to reduce the impact of slowly changing environmental factors such as temperature and humidity on the electrical performance of the antenna, ensure the consistency of testing conditions, and ensure that the distance between the antenna under test and the transmitting antenna meets the far-field test conditions through formulas, so that the incident wave is approximately a plane wave, avoids the interference of the complexity of the near-field phase distribution on the test results, and ensures the accuracy of phase measurement.

[0039] 2. By polarization matching between the transmitting antenna and the antenna under test, signal transmission efficiency is maximized. Using a laser beam as a reference line, the target position offset is detected through emission, transmission, or interferometry. The laser beam is aligned with the equipment coordinate system to achieve high-precision alignment of the geometric center of the antenna under test with the rotation center of the antenna turntable and the axis of the transmitting antenna. This eliminates measurement errors introduced by mechanical installation deviations and ensures the consistency of the detection benchmark. All equipment is preheated to ensure the internal components of the vector network analyzer, turntable, and other electronic equipment reach a thermally stable state, avoiding measurement fluctuations caused by parameter drift during initial equipment startup and further improving detection accuracy.

[0040] 3. Computer-aided automatic testing software is used to set parameters such as test frequency, transmission level, and turntable speed, and displays the phase curve in real time, reducing parameter setting errors and reading deviations caused by manual operation. The axial alignment of the transmitting antenna with the antenna under test is defined as 0°, and clockwise and counterclockwise rotations of 90° are defined as +90° and -90° respectively. This standardized angular reference avoids directional errors caused by operators' differing understandings of the "zero position," improving the standardization of the testing process.

[0041] 4. By collecting data such as adjustment time and number of adjustments from different operators, invalid operations that did not reach the ideal state are eliminated, and only successful adjustment data is analyzed to establish an operation feedback index model. This model comprehensively considers the relationship between the single adjustment time and the historical average time, and the current number of adjustments and the historical extreme values, to quantify the operator's operational efficiency. If the current operation feedback index increases beyond the preset upper limit, it indicates that there may be a hidden fault in the equipment, requiring maintenance before testing to avoid invalid test results due to equipment performance degradation. A comprehensive evaluation index is formed by weighted averaging of the most recent operation feedback index of each operator. When the comprehensive operation index exceeds the threshold, it indicates that multiple operators are exhibiting abnormal operating trends, which may be caused by deterioration of the microwave anechoic chamber environment or systemic equipment failure. Testing needs to be suspended and a comprehensive overhaul performed to achieve dynamic monitoring of the overall status of the testing system and prevent batch testing errors.

[0042] 5. By rotating the antenna under test 90° around its polarization axis and repeating the testing process, the coincidence point of the phase curve under ideal conditions after two rotations is used to accurately determine the coincidence position between the antenna phase center and the turntable rotation center. This avoids misjudgment of phase center offset caused by antenna polarization orthogonality deviation during single-direction testing, achieving accurate calculation of the phase center in three-dimensional space. The antenna testing software automatically displays the distance of the antenna under test from the phase center and calculates the specific position of the phase center based on the wireless geometric model, providing quantitative data support for antenna design optimization. This helps improve the symmetry of the antenna radiation pattern, reduce sidelobe levels, and thus improve satellite navigation and positioning accuracy and communication link stability.

[0043] 6. The vector network analyzer is required to ensure the accuracy of RF signal amplitude and phase measurements; the five-axis turntable is required to meet the requirements of sub-millimeter position adjustment and arcsecond-level angle control, providing hardware support for the detection of minute phase changes; the transmitting antenna is calibrated in the laboratory and comes with a certificate to ensure the traceability and reliability of its radiation characteristics. Attached Figure Description

[0044] Figure 1 This is a flowchart illustrating the method. Detailed Implementation

[0045] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Example

[0046] Step 1: Connect the transmitting antenna, transmitting turntable, vector network analyzer, computer, printer, antenna turntable, and antenna under test in a microwave anechoic chamber. The microwave anechoic chamber should be covered with shielding and absorbing materials on all six sides, with a quiet zone of at least 0.5m × 0.5m × 0.5m, and should meet far-field conditions.

[0047] ,

[0048] Where R is the distance between the antenna under test and the transmitting antenna, D is the maximum size of the antenna under test, and d is the maximum size of the transmitting antenna. Wavelength;

[0049] Vector network analyzer accuracy requirements: amplitude ≤ 0.5dB, phase ≤ 3°, to ensure the accuracy of RF signal amplitude and phase measurements;

[0050] The antenna turntable is a five-axis turntable with a display resolution of 0.01°, position accuracy of 0.1° for both elevation and vertical, rotation speed of 1° / s to 10° / s for azimuth and 1° / s to 4° / s for elevation, and X / Y displacement accuracy of 0.1mm and resolution of 0.01mm. It meets the requirements for sub-millimeter-level position adjustment and arcsecond-level angle control, providing hardware support for the detection of minute phase changes.

[0051] Launch turntable: 360° azimuth rotation and vertical movement;

[0052] Transmitting antenna: Key parameters have been calibrated in the laboratory and come with calibration certificates, ensuring the traceability and reliability of its radiation characteristics.

[0053] The microwave anechoic chamber is covered with shielding and absorbing materials on all six sides, effectively isolating external electromagnetic interference and creating a reflection-free, low-interference testing environment. This avoids distortion of phase measurement data caused by external electromagnetic signal coupling, ensuring that the test results accurately reflect the antenna's characteristics. Strict limits are placed on parameters such as the quiet zone size, humidity, temperature, and atmospheric pressure within the anechoic chamber to reduce the impact of slowly changing environmental factors like temperature and humidity on the antenna's electrical performance, ensuring consistent testing conditions. A formula ensures that the distance between the tested antenna and the transmitting antenna meets far-field testing conditions, making the incident wave approximately a plane wave, avoiding interference from the complexity of the near-field phase distribution, and guaranteeing the accuracy of phase measurements.

[0054] The second step involves using a laser beam to adjust the antenna under test and the transmitting antenna to ensure consistent measurement standards. Specifically, the polarization of the transmitting antenna is matched with that of the antenna under test to maximize signal transmission efficiency. All equipment is preheated to ensure the internal components of the vector network analyzer, turntable, and other electronic devices reach thermal stability, preventing measurement fluctuations caused by parameter drift during initial startup and further improving detection accuracy. The antenna under test is mounted on the antenna turntable, with its geometric center coinciding with the turntable's rotation center. The transmitting antenna is at the same height as the antenna under test and axially aligned. Using the laser beam as a reference line, the offset of the target position is detected through laser beam emission, transmission, or interference. The laser beam is then aligned with the equipment coordinate system. This achieves high-precision alignment of the geometric center of the antenna under test with the antenna turntable's rotation center and the axial direction of the transmitting antenna, eliminating measurement errors introduced by mechanical installation deviations and ensuring consistent measurement standards.

[0055] The third step is to use automatic testing software on a computer to set the test frequency, transmission level, antenna polarization, turntable speed, rotation angle, and real-time display format to reduce parameter setting errors and reading deviations caused by manual operation.

[0056] The fourth step is to define the 0°, +90°, and -90° displayed on the antenna turntable display. When the transmitting antenna and the antenna under test are axially aligned, the antenna turntable display shows 0°. Rotating the antenna turntable 90° clockwise from 0° is defined as +90°, and rotating the antenna turntable 90° counterclockwise from 0° is defined as -90°. The axial alignment of the transmitting antenna and the antenna under test is defined as 0°, and 90° clockwise and counterclockwise rotations are defined as +90° and -90°, respectively. This standardizes the angle reference, avoids errors in direction judgment caused by differences in operators' understanding of "zero position," and improves the standardization of the testing process.

[0057] Step 5: Use the antenna test software to set the vector network analyzer to phase measurement, and control the antenna turntable to rotate clockwise from -90° to +90°.

[0058] Step 6: Based on the shape of the phase test curve displayed on the computer screen, determine the adjustment direction and distance of the antenna under test, and adjust it until the phase curve reaches the ideal state.

[0059] Step 7: Collect relevant operational data on the direction and distance adjustments made by different operators using the same microwave anechoic chamber. After preprocessing and analyzing the collected data, obtain the comprehensive operational feedback index. Based on the comprehensive operational feedback index, determine whether to continue operation or to repair the testing equipment. The specific steps are as follows:

[0060] 1. Collect relevant operational data on the adjustment of direction and distance by different operators using the same microwave anechoic chamber to obtain the first data, including: the duration of each adjustment for each operation in this microwave anechoic chamber, and the number of adjustments made by each operator in this microwave anechoic chamber each time;

[0061] 2. The second data is obtained by removing the relevant operation data that were not adjusted to the ideal state of the phase curve from the first data, including: the adjustment time for each operator to adjust to the ideal state of the phase curve in this microwave anechoic chamber each time, and the number of times each operator adjusts to the ideal state of the phase curve in this microwave anechoic chamber each time.

[0062] 3. Analyze and process the second data of each operator to obtain the current operation feedback index of each operator in this microwave anechoic chamber. If the increase of the current operation feedback index compared with the average value of the operator's previous operation feedback index in this microwave anechoic chamber is lower than the upper limit of the increase of the operation feedback index, the test continues. Otherwise, the phase center test is suspended, the test equipment is repaired, and the test is resumed after the test equipment is completely normal. The upper limit of the increase of the operation feedback index is set and adjusted according to the needs of the actual operation process.

[0063] 4. The most recent operational feedback index for each operator in this microwave anechoic chamber is processed to obtain a comprehensive operational feedback index. If the comprehensive operational feedback index is below the threshold, testing continues; otherwise, phase center testing is suspended, and the testing equipment is inspected and repaired. Testing resumes only after the equipment is fully functional. The comprehensive operational feedback index threshold is set and adjusted according to the actual needs of the operation.

[0064] When analyzing and processing the second data for each operator to obtain the operator's operational feedback index:

[0065] ,

[0066] in, The operational feedback index for each operator in this microwave anechoic chamber. This is the adjustment time recorded in real time by the operator in this microwave anechoic chamber until the phase curve reaches the ideal state. The larger the value, the greater the operation feedback index. This represents the adjustment time taken by the operator each time to reach the ideal phase curve in this microwave anechoic chamber. It is used to calculate the historical average adjustment time and serves as a benchmark for measuring adjustment time. 'n' represents the number of times the operator has adjusted the phase curve to reach the ideal state in this microwave anechoic chamber, and DN represents the number of adjustments made by the operator in this particular microwave anechoic chamber to reach the ideal phase curve. This refers to the minimum number of adjustments required for the operator to bring the phase curve to an ideal state in this microwave anechoic chamber. This refers to the maximum number of adjustments the operator makes in this microwave anechoic chamber until the phase curve reaches the ideal state.

[0067] The results are mapped to a range of 0 and 1 to avoid the influence of extreme values, and the historical average adjustment time is used as a benchmark to reflect the long-term performance of the operators. Assess the stability of this adjustment frequency relative to historical extremes. It tends to reward operations that are close to the minimum number of adjustments. standardization By introducing extreme values, the influence of individual outliers can be eliminated. By combining time efficiency and frequency stability, the performance of a single operation by an operator is dynamically quantified, balancing short-term performance with long-term historical data, avoiding bias from a single indicator, and the standardized results provide a unified dimension for subsequent comprehensive evaluation.

[0068] When the comprehensive operational feedback index is obtained by processing the most recent operational feedback index of each operator in this microwave anechoic chamber:

[0069] ,

[0070] in, As a comprehensive operational feedback index, Each operator adjusts the phase curve to the ideal state in this microwave anechoic chamber a certain number of times. This refers to the number of times all operators adjust the phase curve in this microwave anechoic chamber until it reaches the ideal state. The most recent operation feedback index for each operator. The weighting is assigned based on the proportion of times each operator achieves the ideal phase curve in this microwave anechoic chamber, relative to the total number of times all operators achieve this. Operators who achieve the ideal phase curve more frequently have a greater impact on the overall performance, resulting in a higher weighting for their operational feedback index and a greater contribution to the comprehensive operational feedback index. The settings are based on the most recent operation to better reflect the current status of the testing equipment, making it more sensitive to anomalies. The comprehensive operation feedback index integrates the operation feedback from multiple operators through weighted averaging, focusing on the latest performance of high-frequency operators. This design can identify systemic risks, such as testing equipment failure, rather than accidental errors by individual operators. When the comprehensive operation feedback index exceeds the threshold, it indicates that multiple operators have exhibited abnormalities, requiring a halt to testing and investigation of the testing equipment.

[0071] Step 8: Rotate the antenna under test 90° around its polarization axis and repeat steps 4 to 6. The point where the antenna under test coincides with the rotation center of the antenna turntable is the phase center of the antenna under test. By rotating the antenna under test 90° around its polarization axis and repeating the detection process, the coincidence point of the phase curve under ideal conditions after two rotations is used to accurately determine the coincidence position of the antenna phase center and the rotation center of the turntable. This avoids misjudgment of phase center offset caused by antenna polarization orthogonality deviation in single-direction detection and achieves accurate calculation of the phase center in three-dimensional space.

[0072] Step 9: The antenna testing software automatically displays the distance of the antenna under test from the phase center. Based on the distances of the three components displayed, it calculates the specific location of the phase center of the antenna under test in the wireless geometry. The antenna testing software automatically displays the distance of the antenna under test from the phase center and calculates the specific location of the phase center based on the wireless geometry model. This provides quantitative data support for antenna design optimization, helps to improve the symmetry of the antenna radiation pattern, reduce the sidelobe level, and thus improve the accuracy of satellite navigation and positioning and the stability of the communication link.

[0073] Similarly, the phase center at different frequencies can be detected through the above steps. Example

[0074] When calculating the operational feedback index, when Then we have:

[0075] ,

[0076] If the increase of 0.538 compared to the average value of the operator's previous operating feedback index in this microwave anechoic chamber is lower than the upper limit of the increase of the operating feedback index, the test continues; otherwise, the phase center test is suspended, the testing equipment is inspected and repaired, and the test is resumed only after the testing equipment is completely normal. Example

[0077] When calculating the comprehensive operational feedback index, when Then we have: ,

[0078] If 0.626 is lower than the comprehensive operation feedback index threshold, continue testing; otherwise, suspend phase center testing, repair the testing equipment, and resume testing only after the testing equipment is fully operational.

[0079] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A method for detecting the phase center of a feed source for a Beidou navigation antenna and communication antenna, characterized in that, Specifically, the following steps are included: S1. Connect the transmitting antenna, transmitting turntable, vector network analyzer, computer, printer, antenna turntable and antenna under test in the microwave anechoic chamber; S2. Use a laser beam to adjust the antenna under test and the transmitting antenna to ensure that the measurement reference is consistent; S3. Use automatic testing software on the computer to set the test frequency, transmission level, antenna polarization, turntable speed, rotation angle, and real-time display format; S4. Define the 0°, +90°, and -90° displayed on the antenna turntable display device; S5. Use the antenna test software to set the vector network analyzer to phase measurement, and control the antenna turntable to rotate from -90° to +90° clockwise. S6. Based on the shape of the phase test curve displayed on the computer screen, determine the adjustment direction and distance of the antenna under test, and adjust it until the phase curve reaches the ideal state. S7. Collect relevant operational data on the direction and distance adjustment by different operators using the same microwave anechoic chamber. After preprocessing and analyzing the collected data, obtain the comprehensive operation feedback index. Based on the comprehensive operation feedback index, determine whether to continue operation or to repair the testing equipment. S8. Rotate the antenna under test 90° around its polarization axis and repeat steps S4 to S6. The point where the antenna under test coincides with the rotation center of the antenna turntable is the phase center of the antenna under test. S9. The antenna test software automatically displays the distance of the antenna under test from the phase center, and calculates the specific location of the phase center of the antenna under test in the wireless geometry based on the distance of the three displayed components. Step S7 includes the following specific steps: S73. Analyze and process the second data of each operator to obtain the current operation feedback index of each operator in this microwave anechoic chamber. If the increase of the current operation feedback index compared with the average value of the previous operation feedback index of the operator in this microwave anechoic chamber is lower than the upper limit of the increase of the operation feedback index, continue the detection. Otherwise, suspend the phase center detection, carry out the inspection equipment maintenance, and resume the detection after the inspection equipment is completely normal. S74. Process the most recent operation feedback index of each operator in this microwave anechoic chamber to obtain the comprehensive operation feedback index. When the comprehensive operation feedback index is lower than the comprehensive operation feedback index threshold, continue the detection. Otherwise, suspend the phase center detection, carry out the inspection equipment maintenance, and resume the detection after the inspection equipment is completely normal. In step S73, when analyzing and processing the second data of each operator to obtain the operation feedback index for each operator: 、 in, The operational feedback index for each operator in this microwave anechoic chamber. This refers to the adjustment time taken by the operator in this microwave anechoic chamber to bring the phase curve to an ideal state. Let DN be the adjustment time taken by the operator each time to adjust the phase curve to the ideal state in this microwave anechoic chamber, n be the number of times the operator adjusts the phase curve to the ideal state in this microwave anechoic chamber, and DN be the number of adjustments made by the operator in this particular microwave anechoic chamber to achieve the ideal phase curve. This refers to the minimum number of adjustments required for the operator to bring the phase curve to an ideal state in this microwave anechoic chamber. This is the maximum number of adjustments the operator can make in this microwave anechoic chamber until the phase curve reaches the ideal state. In step S74, when obtaining the comprehensive operation feedback index by processing the most recent operation feedback index of each operator in this microwave anechoic chamber: 、 in, As a comprehensive operational feedback index, Each operator adjusts the phase curve to the ideal state in this microwave anechoic chamber a certain number of times. This refers to the number of times all operators adjust the phase curve in this microwave anechoic chamber until it reaches the ideal state. The most recent operation feedback index for each operator.

2. The method for detecting the phase center of a Beidou navigation antenna and communication antenna feed source according to claim 1, characterized in that: In step S1, the microwave anechoic chamber is covered with shielding and absorbing materials on all six sides. Its quiet zone is no less than 0.5m × 0.5m × 0.5m, with humidity of 45%–75%, temperature of 15℃–35℃, and atmospheric pressure of 86.0kPa–101.30kPa. It is free from electromagnetic interference and meets the far-field conditions. 、 Where R is the distance between the antenna under test and the transmitting antenna, D is the maximum size of the antenna under test, and d is the maximum size of the transmitting antenna. Wavelength; Vector network analyzer accuracy requirements: amplitude ≤ 0.5dB, phase ≤ 3°; The antenna turntable is a five-axis turntable with a display resolution of 0.01°, position accuracy of 0.1° for both elevation and vertical, rotation speed of 1° / s to 10° / s for azimuth and 1° / s to 4° / s for elevation, and X / Y displacement accuracy of 0.1mm and resolution of 0.01mm. Launch turntable: 360° azimuth rotation and vertical movement; Transmitting antenna: Key parameters have been calibrated in the laboratory and come with a calibration certificate.

3. The method for detecting the phase center of a Beidou navigation antenna and communication antenna feed source according to claim 1, characterized in that: The specific steps of step S2 are as follows: S21. Match the polarization of the transmitting antenna with the polarization of the antenna under test; S22. Preheat all equipment; S23. Mount the antenna under test on the antenna turntable, with the geometric center of the antenna under test coinciding with the rotation center of the antenna turntable. The transmitting antenna and the antenna under test are at the same height and aligned axially. Use the laser beam as a reference straight line. Detect the offset of the target position through the emission, transmission or interference of the laser beam. Align the laser beam with the equipment coordinate system to ensure that the measurement reference is consistent.

4. The method for detecting the phase center of a Beidou navigation antenna and communication antenna feed according to claim 1, characterized in that: In step S4, when the transmitting antenna and the antenna under test are axially aligned, the antenna turntable display device displays 0°. Rotating the antenna turntable 90° clockwise from 0° is defined as +90°, and rotating the antenna turntable 90° counterclockwise from 0° is defined as -90°.

5. The method for detecting the phase center of a Beidou navigation antenna and communication antenna feed according to claim 1, characterized in that: Step S7 further includes: S71. Collect relevant operation data on the adjustment of direction and distance by different operators using the same microwave anechoic chamber to obtain the first data, including: the adjustment time for each operation in this microwave anechoic chamber, and the number of adjustments made by each operator in this microwave anechoic chamber. S72. The second data is obtained by removing the relevant operation data that has not been adjusted to the ideal state of the phase curve from the first data, including: the adjustment time for each operator to adjust to the ideal state of the phase curve in this microwave anechoic chamber each time, and the number of times each operator adjusts to the ideal state of the phase curve in this microwave anechoic chamber each time.

6. The method for detecting the phase center of a Beidou navigation antenna and communication antenna feed source according to claim 1, characterized in that: In step S73, the upper limit of the increase of the operation feedback index is set and adjusted according to the needs of the actual operation process.

7. The method for detecting the phase center of a Beidou navigation antenna and communication antenna feed according to claim 1, characterized in that: In step S74, the comprehensive operation feedback index threshold is set and adjusted according to the needs of the actual operation process.

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