A method for testing amplitude and phase of phased array antenna

Abstract

The present invention provides a phased array antenna amplitude and phase test method, which is implemented by a test system, and the test system includes a tested antenna, a transfer tool, a test tool, a test antenna, an antenna packaging box, a phase-stabilizing cable, a vector network, a ground inspection and a PC. Beneficial effects of the present invention: The present invention can measure the amplitude and phase changes of the passive part and the active part of each channel of the antenna, which is conducive to real-time grasp of the antenna status, and can accurately locate the problem, facilitate problem investigation, make the test more efficient, and the test time is expected to be shortened by 90%; in addition, the test coverage is full, and it can effectively calibrate large antennas anytime and anywhere.

Description

Technical Field

[0001] The invention belongs to the technical field of phased array antenna amplitude and phase testing, and in particular relates to a phased array antenna amplitude and phase testing method. Background Art

[0002] Phased array antenna is an advanced antenna technology that dynamically adjusts the directionality and shape of the beam by controlling the phase of multiple antenna elements. This technology is widely used in radar, communication, satellite and military systems. The following are some key points about phased array antenna.

[0003] In recent years, commercial SAR payloads have developed rapidly. SAR antennas mostly use phased array systems. The main characteristics of phased array antennas are: the antenna aperture is large, and they are generally composed of multiple array surfaces. Due to the application requirements of satellite-borne SAR antennas, phased array antennas have stricter requirements on their own amplitude and phase.

[0004] For such large antennas, there are often multiple testing links during the pre-delivery testing process, including assembly testing, mechanical testing, thermal cycle testing, thermal vacuum testing, darkroom testing, delivery, etc. Each stage involves the transfer and transportation of large antennas. For such large antennas, the amplitude and phase characteristics of the antenna may change during each transportation process. If they are not discovered and corrected in time, it will greatly affect the test accuracy and thus affect the antenna performance in the final state.

[0005] Therefore, it is particularly important to accurately test phased array antennas with large apertures and high amplitude phase requirements, such as spaceborne SAR antennas. Summary of the invention

[0006] In view of this, the present invention aims to propose a phased array antenna amplitude and phase testing method to solve the problem that high-precision amplitude and phase testing can be performed in each link before the antenna is delivered; to solve the problem that the test is convenient and fast, with full coverage, greatly shortening the test time and quickly locating the problem if it occurs.

[0007] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0008] A phased array antenna amplitude and phase test method, the amplitude and phase test method is implemented by a test system, the test system comprises a tested antenna, a transfer tool, a test tool, a test antenna, an antenna packaging box, a phase-stabilizing cable, a vector network, a ground inspection and a PC; the transfer tool is placed inside the antenna packaging box, the tested antenna and the test tool are installed on the transfer tool, the test antenna is installed above the test tool, the signal channel between the vector network and the test antenna is a data stream a, the signal channel between the vector network and the tested antenna is a data stream b, the signal channel between the ground inspection and the tested antenna is a data stream c, the signal channel between the vector network and the PC is a data stream d, the signal channel between the vector network and the ground inspection is a data stream e, and the signal channel between the ground inspection and the PC is a data stream f;

[0009] The amplitude and phase test method is as follows:

[0010] Step 1: Connect the antenna under test to the transfer tooling, fasten them with screws, and place them in the antenna packaging box with the radiation surface facing upwards.

[0011] Step 2: Connect the test fixture to the transfer fixture and fasten them with screws;

[0012] Step 3: Connect the test antenna to the test fixture and fasten them with screws. Place absorbing materials inside the antenna packaging box.

[0013] Step 4: Connect the two ports of the vector network to the phase-stabilized cables, complete the frequency point and output power setting of the vector network, and use the standard calibration parts to complete the calibration of the vector network;

[0014] Step 5: Complete the test system wiring, where VAN port 1 is connected to the test antenna, and VAN port 2 is connected to the transceiver port of the antenna under test;

[0015] Step 6: Set the number of channels, number of wave positions, wave position number, and frequency point parameters on the ground inspection host computer;

[0016] Step 7: Power on the test system and execute the test start command on the ground inspection host computer;

[0017] Step 8: The vector network completes the acquisition of different wave positions and different frequency points of all channels, and transmits the acquired data to the ground inspection host computer. The ground inspection host computer completes data analysis and generates a test report. The report will show the amplitude and phase difference between this measurement and the test value before the transfer, and a three-dimensional matrix can be obtained, with one dimension being the channel number, one dimension being the wave position number, and one dimension being the frequency point;

[0018] Step 9: Keep the VNA powered on but turn off the signal output. Power off other devices and connect the second port of the VNA to the calibration port of the antenna under test.

[0019] Step 10: Power on the test system and execute the test start command on the ground inspection host computer;

[0020] Step 11: The vector network completes the acquisition of different wave positions and different frequency points of all channels, and transmits the acquired data to the ground inspection host computer. The ground inspection host computer completes data analysis and generates a test report. The report will show the amplitude and phase difference between this test and the test data before the transfer, and mark the number of the abnormal channel. A three-dimensional matrix can be obtained, with one dimension for the channel number, one dimension for the wave position number, and one dimension for the frequency point;

[0021] Step 12: Passive part amplitude and phase analysis: the two measured amplitude sets are subtracted to obtain a new amplitude set AS-BS, and the two measured phase sets are subtracted to obtain a new phase set θS-ΦS. After normalizing the new amplitude set and the new phase set, the amplitude and phase changes of each channel and each frequency point of the passive part of the phased array antenna can be obtained.

[0022] Step 13: Adjust the VAN cable, connect VAN port 1 to the antenna under test, and connect VAN port 2 to the test antenna; re-change the ground inspection host computer settings, change the antenna to the transmission mode, and execute the above steps to obtain the amplitude and phase changes of the active and passive parts of the transmission channel.

[0023] Furthermore, the antenna under test includes a radiation unit and an antenna mounting plate, and a transfer tool installation and positioning interface is reserved on the side of the antenna mounting plate, and the transfer tool installation and positioning interface is used to install and position the transfer tool.

[0024] Furthermore, the transfer tooling includes a main frame and a connecting lug, the main frame is provided with a test tooling locating pin, the test tooling locating pin is used to position the test tooling, the connecting lug is provided with a test tooling locating pin, the test tooling locating pin is used to position the test tooling, and the connecting lug is also provided with fixing and locating holes, the fixing and locating holes are used for positioning and fastening with the transfer tooling installation and positioning interface on the antenna under test.

[0025] Furthermore, the test tooling is provided with a test tooling positioning hole and a test antenna mounting hole. The test tooling positioning hole is used for positioning with a test tooling positioning pin on the transfer tooling, and the test antenna mounting hole is used for mounting a test antenna.

[0026] Furthermore, the phase-stabilizing cable is used to ensure that each test of the antenna under test does not introduce amplitude or phase errors into the test antenna;

[0027] The vector network is a dual-port vector network, which is used to complete the amplitude and phase measurement of the antenna under test at different frequencies;

[0028] The ground detection is an embedded board, which serves as a medium between the ground detection host computer and the vector network and the antenna under test, and is used to complete the control of the antenna under test and the vector network and data return;

[0029] The PC communicates with the ground inspection through the 232 interface and with the vector network through the network port. The PC includes the ground inspection host computer software. The functions of the ground inspection host computer software include:

[0030] The configuration of the antenna under test, the ground inspection, and the vector network are all performed through the ground inspection host computer software;

[0031] The ground inspection host computer software can display the status of the antenna under test, the ground inspection status and the vector network status in real time;

[0032] The ground inspection host computer software can read the amplitude and phase data of each channel and each frequency point returned by the vector network, save them to disk, and process the amplitude and phase data to generate analysis reports and amplitude and phase truth tables. The amplitude and phase truth tables can be sent to the antenna under test to complete the amplitude and phase compensation of the channel.

[0033] Furthermore, the data stream a is a radio frequency signal, which is a radio frequency signal output from the vector network port 1 to the test antenna;

[0034] The data stream b is a radio frequency signal, which is output by the antenna under test and connected to the vector network port 2;

[0035] The data stream c is a digital signal, which includes the command and timing control signal output by the ground detector to the antenna under test, and the telemetry parameters returned by the antenna under test;

[0036] The data stream d is a digital signal, the amplitude and phase data returned by the vector network, which is returned to the PC for data processing;

[0037] The data stream e is a digital signal, which is a synchronization signal output by the ground detector to the vector network, controlling the vector network to perform data sampling according to the timing;

[0038] The data stream f is a digital signal, which is the remote control and telemetry data between the ground inspection and the PC.

[0039] Compared with the prior art, the phased array antenna amplitude and phase testing method described in the present invention has the following advantages:

[0040] The phased array antenna amplitude and phase testing method described in the present invention can measure the amplitude and phase changes of the passive part and the active part of each channel of the antenna, which is conducive to real-time grasp of the status of the antenna, and can accurately locate the problem at the same time, facilitate problem investigation and treatment, make the test more efficient, and the test time is expected to be shortened by 90%; in addition, the test coverage is comprehensive, and large antennas can be calibrated anytime and anywhere. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0042] Figure 1 A schematic diagram of a test system according to an embodiment of the present invention;

[0043] Figure 2 A schematic diagram of an antenna under test according to an embodiment of the present invention;

[0044] Figure 3 This is a schematic diagram of a transfer tooling according to an embodiment of the present invention;

[0045] Figure 4 A schematic diagram of a test tool according to an embodiment of the present invention;

[0046] Figure 5 This is a schematic diagram of placing the absorbing material according to an embodiment of the present invention;

[0047] Figure 6 A schematic diagram of the principle of a test system according to an embodiment of the present invention;

[0048] Figure 7 This is a test timing diagram according to an embodiment of the present invention.

[0049] Description of reference numerals:

[0050] 1. Antenna under test; 2. Transfer tooling; 3. Test tooling; 4. Test antenna; 5. Antenna packaging box;

[0051] 101. Radiating unit; 102. Antenna mounting plate; 1021. Transfer tooling installation and positioning interface;

[0052] 201, main frame; 2011, test fixture positioning pin; 202, connecting lug; 2021, test fixture positioning pin; 2022, fixing and positioning hole;

[0053] 301, test tool positioning hole; 302, test antenna installation hole. DETAILED DESCRIPTION

[0054] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0055] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0056] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0057] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0058] like Figures 1 to 7 As shown, a phased array antenna amplitude and phase test method is implemented by a test system. The main components of the test system are: an antenna to be tested 1, a transfer tooling 2, an antenna packaging box 5, a test tooling 3, a test antenna 4, a phase-stabilizing cable, a vector network, a ground inspection and a PC.

[0059] The antenna 1 under test is a phased array antenna, which consists of multiple channels. Here, each channel is divided into two parts, an active part and a passive part. The active part is the active receiving channel of the TR component, and the passive part is KK and the radiation unit. Through the test method proposed in the present invention, the amplitude and phase changes of the passive part and the active part of each channel of the phased array antenna can be calibrated.

[0060] like Figure 2As shown, the antenna 1 under test, i.e., a phased array antenna, is generally large in size and has a large number of channels. Here, an example of 1 meter × 1 meter in size and 200 channels is used for illustration. The antenna 1 under test has two external RF ports, one of which is a transceiver port and the other is a calibration port. The antenna 1 under test includes a radiation unit 101 and an antenna mounting plate 102. The side of the antenna mounting plate 102 has a transfer tool installation and positioning interface 1021, i.e., two threaded holes plus two pin holes.

[0061] The antenna packaging box 5, inside which the antenna is placed during transportation, has a shock-absorbing function.

[0062] like Figure 3 As shown, the transfer tool 2 is connected to the antenna 1 under test with high precision and reliability through pins and fastening screws, and the transfer tool 2 is in direct contact with the antenna packaging box 5 to ensure that the front and back sides of the antenna 1 under test are not subjected to force. The transfer tool 2 includes a main frame 201 and a connecting lug 202, and the connecting lug 202 includes a positioning pin 2021 for the test tool. A test tool locating pin 2011 is provided on the main frame 201, and the test tool locating pin 2011 is used to locate the test tool 3. A fixing and positioning hole 2022 is also reserved on the connecting lug 202. The fixing and positioning hole 2022 includes two fixing holes and two positioning holes, which are used to locate and fasten with the transfer tool installation and positioning interface 1021 on the antenna 1 under test. Since the antenna 1 under test and the transfer tool 2 are each a whole and will not be disassembled, there is only a connection error between the two. The center straightness of the two positioning holes is 0.01 (IT6 grade), the positioning pin shaft fit belongs to the basic shaft system (G7h6) clearance fit, and the error between the holes is within 0.02. The connection error between the two is controlled within 0.03mm, and the flatness is guaranteed to be within 0.1mm through processing.

[0063] like Figure 4 As shown, the test fixture 3 and the test antenna 4, the test fixture 3 is provided with a test fixture positioning hole 301 and a test antenna installation hole 302, and two test fixture positioning holes 301 are left at the bottom of the test fixture 3 for positioning with the test fixture positioning pin 2011 on the transfer fixture 2, the center straightness of the two test fixture positioning holes 301 is 0.015 (IT6 grade), the positioning pin shaft fit belongs to the basic shaft system (G7h6) clearance fit, the hole error is within 0.02, the connection error between the two is controlled within 0.035mm, and the flatness is guaranteed to be within 0.1mm through processing. Once the test antenna 4 and the test fixture 3 are fastened by bolts, they will not be disassembled again, and there is no problem of repeated positioning accuracy. Therefore, the whole set of tests only has the above two positioning errors, which are generally within 0.065mm and the flatness is within 0.2mm.

[0064] The high amplitude and phase stability of the phase-stable cable ensures that each test of the antenna 1 under test will not introduce amplitude and phase errors into the test antenna 4, thereby ensuring the test accuracy.

[0065] Vector network, dual-port vector network, completes the amplitude and phase measurement of different frequency points of the antenna 1 under test.

[0066] The ground detection is an embedded board, which serves as a medium between the ground detection host computer and the vector network and the antenna 1 under test. It is used to complete the control of the antenna 1 under test and the vector network and the data feedback. It is precisely because of the high real-time performance of the ground detection that the accuracy and efficiency of the test are guaranteed, greatly shortening the test time.

[0067] PC computer, PC computer communicates with ground inspection through 232 interface, and communicates with vector network through network port. PC computer contains ground inspection host computer software, which is a visualization software, and its main functions are:

[0068] 1. The configuration of the antenna 1 under test, the configuration of the ground detector, and the configuration of the vector network are all performed through this software;

[0069] 2. The software can display the status of the antenna 1 under test, the status of the ground detection, and the status of the vector network in real time;

[0070] 3. Read the amplitude and phase data of each channel and each frequency point returned by the vector network, save them to disk, and process the data to generate an analysis report and an amplitude and phase truth table. The truth table can be sent to the antenna 1 under test to complete the amplitude and phase compensation of the channel.

[0071] The data flow is described as follows:

[0072] Data stream a: RF signal, the RF signal output from vector network port 1 to test antenna 4;

[0073] Data stream b: RF signal, the RF signal output by the antenna 1 under test is connected to the vector network port 2;

[0074] Data stream c: digital signal, command and timing control signal output by the ground detector to the antenna 1 under test, and telemetry parameters returned by the antenna 1 under test;

[0075] Data stream d: digital signal, amplitude and phase data returned by the vector network, is returned to the PC for data processing;

[0076] Data stream e: digital signal, the synchronization signal output by the ground detector to the vector network, controlling the vector network to perform data sampling according to the timing;

[0077] Data stream f: digital signal, remote control and telemetry data between ground inspection and PC.

[0078] Test system working sequence:

[0079] The test system can automatically complete the amplitude and phase measurement of all channels at different wave positions and frequencies in one test task. The test workload is very large, so it is particularly important to quickly complete all test tasks. Here, the ground detection plays a vital role. It controls the antenna under test, the vector network, and the ground detection host computer to work according to the established timing. The test timing is as follows: Figure 7 shown.

[0080] The test process and method are as follows:

[0081] Step 1: The antenna 4 to be tested is connected to the transfer tooling 2 with high precision and fastened with screws, and the whole is placed in the antenna packaging box 5 with the radiation surface facing upwards;

[0082] Step 2: The test fixture 3 and the transfer fixture 2 are connected with high precision and fastened with screws;

[0083] Step 3: The test antenna 4 is connected to the test fixture 3 with high precision and fastened with screws. The antenna packaging box 5 is filled with absorbing materials, such as Figure 5 As shown;

[0084] Step 4: Connect the two ports of the vector network to the phase-stabilized cables, complete the settings of the frequency point (here set to 3 frequency points), output power, etc., and use the standard calibration parts to complete the calibration of the vector network;

[0085] Step 5: Follow Figure 6 Complete the system wiring, where VN port 1 is connected to the test antenna 4, and VN port 2 is connected to the transceiver port of the antenna 1 under test;

[0086] Step 6: The ground inspection host computer sets the number of channels (here set to 200), the number of wave positions (here set to 12), the wave position number (from 1 to 12), the frequency point (here set to 3 frequency points) and other parameter settings;

[0087] Step 7: Power on the system and execute the test start command on the ground inspection host computer;

[0088] Step 8: The vector network completes the acquisition of different wave positions and different frequency points of all channels, and transmits the acquired data to the ground inspection host computer. The ground inspection host computer completes data analysis and generates a test report. The report will show the amplitude and phase difference between this measurement and the test value before the transfer, so that designers can judge whether the radiation performance of the antenna is affected. A three-dimensional matrix will be obtained, with one dimension for the channel number, one dimension for the wave position number, and one dimension for the frequency point. Here, taking one frequency point and one wave position as an example, a set of receiving amplitude sets AS={A 1,1 ,A 1,2 ,A 1,3 ; A 2,1 ,A 2,2 ,A 2,3;...;A 200,1 ,A 200,2 ,A 200,3} and a set of receiving phase sets θS={θ 1,1 ,θ 1,2 ,θ 1,3 θ 2,1 ,θ 2,2 ,θ 2,3 ;...;θ 200,1 ,θ 200,2 ,θ 200,3};

[0089] Step 9: Keep the VNA powered on but turn off the signal output. Power off other devices and connect the second port of the VNA to the calibration port of the antenna under test.

[0090] Step 10: Power on the system and execute the test start command on the ground inspection host computer;

[0091] Step 11: The vector network completes the collection of different wave positions and different frequency points of all channels, and transmits the collected data to the ground inspection host computer. The ground inspection host computer completes the data analysis and generates a test report. The report will show the amplitude and phase differences between this test and the test data before the transfer, and mark the number of the abnormal channel for designers to judge whether the radiation performance of the antenna is affected. If an abnormality occurs, the problem can be quickly located based on the measurement results. A three-dimensional matrix will be obtained, with one dimension being the channel number, one dimension being the wave position number, and one dimension being the frequency point. Here, taking one frequency point and one wave position as an example, another set of receiving channel amplitude sets BS={B 1,1 ,B 1,2 ,B 1,3 ; B 2,1 ,B 2,2 ,B 2,3 ;...;B 200,1 ,B 200,2 ,B 200,3} and a set of receiving channel phase sets ΦS={Φ 1,1 ,Φ 1,2 ,Φ 1,3 ; Φ 2,1 ,Φ 2,2 ,Φ 2,3 ;...;Φ 200,1 ,Φ 200,2 ,Φ 200,3}; The amplitude set and phase set obtained by normalizing the amplitude values ​​with respect to the first frequency point of the first channel are the amplitude and phase changes of each receiving channel at each frequency point of the active part of the phased array antenna (excluding the part of the phased array antenna KK and the radiation unit).

[0092] Step 12: Amplitude and phase analysis of the passive part. The two measured amplitude sets are subtracted to obtain a new amplitude set AS-BS, and the two measured phase sets are subtracted to obtain a new phase set θS-ΦS. After normalizing the new amplitude set and the new phase set, the amplitude and phase changes of each channel and frequency point of the passive part of the phased array antenna (phased array antenna KK and radiation unit part) are obtained.

[0093] Step 13: Adjust the VNA cable, connect the VNA port 1 to the antenna under test, and connect the VNA port 2 to the test antenna. Re-change the host computer settings, change the antenna to the transmit mode, and execute the above steps to obtain the amplitude and phase changes of the active and passive parts of the transmit channel.

[0094] In summary, the above method can be used to measure the amplitude and phase changes of the passive and active parts of each channel of the antenna, which is conducive to real-time understanding of the status of the antenna. At the same time, it can accurately locate the problem and facilitate problem investigation.

[0095] Advantages of the present invention:

[0096] The present invention can measure the amplitude and phase changes of the passive part and the active part of each channel of the antenna, which is conducive to grasping the status of the antenna in real time. At the same time, it can accurately locate the problem, facilitate problem investigation, make the test more efficient, and the test time is expected to be shortened by 90%. In addition, the test coverage is comprehensive, and large antennas can be calibrated anytime and anywhere.

[0097] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A phased array antenna amplitude and phase testing method, characterized by: The amplitude and phase test method is implemented by a test system, which includes an antenna to be tested, a transfer tool, a test tool, a test antenna, an antenna packaging box, a phase-stabilizing cable, a vector network, a ground inspection and a PC; the transfer tool is placed inside the antenna packaging box, the antenna to be tested and the test tool are installed on the transfer tool, and the test antenna is installed above the test tool. The signal channel between the vector network and the test antenna is data stream a, the signal channel between the vector network and the antenna to be tested is data stream b, the signal channel between the ground inspection and the antenna to be tested is data stream c, the signal channel between the vector network and the PC is data stream d, the signal channel between the vector network and the ground inspection is data stream e, and the signal channel between the ground inspection and the PC is data stream f; The amplitude and phase test method is as follows: Step 1: Connect the antenna under test to the transfer tooling, fasten them with screws, and place them in the antenna packaging box with the radiation surface facing upwards. Step 2: Connect the test fixture to the transfer fixture and fasten them with screws; Step 3: Connect the test antenna to the test fixture and fasten them with screws. Place absorbing materials inside the antenna packaging box. Step 4: Connect the two ports of the vector network to the phase-stabilized cables, complete the frequency point and output power setting of the vector network, and use the standard calibration parts to complete the calibration of the vector network; Step 5: Complete the test system wiring, where VAN port 1 is connected to the test antenna, and VAN port 2 is connected to the transceiver port of the antenna under test; Step 6: Set the number of channels, number of wave positions, wave position number, and frequency point parameters on the ground inspection host computer; Step 7: Power on the test system and execute the test start command on the ground inspection host computer; Step 8: The vector network completes the acquisition of different wave positions and different frequency points of all channels, and transmits the acquired data to the ground inspection host computer. The ground inspection host computer completes data analysis and generates a test report. The report will show the amplitude and phase difference between this measurement and the test value before the transfer, and a three-dimensional matrix can be obtained, with one dimension being the channel number, one dimension being the wave position number, and one dimension being the frequency point; Step 9: Keep the VNA powered on but turn off the signal output. Power off other devices and connect the second port of the VNA to the calibration port of the antenna under test. Step 10: Power on the test system and execute the test start command on the ground inspection host computer; Step 11: The vector network completes the acquisition of different wave positions and different frequency points of all channels, and transmits the acquired data to the ground inspection host computer. The ground inspection host computer completes data analysis and generates a test report. The report will show the amplitude and phase difference between this test and the test data before the transfer, and mark the number of the abnormal channel. A three-dimensional matrix can be obtained, with one dimension for the channel number, one dimension for the wave position number, and one dimension for the frequency point; Step 12: Passive part amplitude and phase analysis: the two measured amplitude sets are subtracted to obtain a new amplitude set AS-BS, and the two measured phase sets are subtracted to obtain a new phase set θS-ΦS. After normalizing the new amplitude set and the new phase set, the amplitude and phase changes of each channel and each frequency point of the passive part of the phased array antenna can be obtained. Step 13: Adjust the VAN cable, connect VAN port 1 to the antenna under test, and connect VAN port 2 to the test antenna; re-change the ground inspection host computer settings, change the antenna to the transmission mode, and execute the above steps to obtain the amplitude and phase changes of the active and passive parts of the transmission channel.

2. The phased array antenna amplitude and phase testing method according to claim 1, characterized in that: The antenna under test includes a radiation unit and an antenna mounting plate. A transfer tool installation and positioning interface is reserved on the side of the antenna mounting plate. The transfer tool installation and positioning interface is used to install and position the transfer tool.

3. The phased array antenna amplitude and phase testing method according to claim 1, characterized in that: The transfer tooling includes a main frame and a connecting lug. The main frame is provided with a test tooling locating pin, which is used to position the test tooling. The connecting lug is provided with a test tooling locating pin, which is used to position the test tooling. The connecting lug is also provided with a fixing and locating hole, which is used to position and fasten the transfer tooling installation and positioning interface on the antenna under test.

4. The phased array antenna amplitude and phase testing method according to claim 1, characterized in that: The test fixture is provided with a test fixture positioning hole and a test antenna installation hole. The test fixture positioning hole is used for positioning with the test fixture positioning pin on the transfer fixture, and the test antenna installation hole is used for installing the test antenna.

5. The phased array antenna amplitude and phase testing method according to claim 1, characterized in that: The phase-stable cable is used to ensure that each test of the antenna under test does not introduce amplitude or phase errors into the test antenna; The vector network is a dual-port vector network, which is used to complete the amplitude and phase measurement of the antenna under test at different frequencies; The ground detection is an embedded board, which serves as a medium between the ground detection host computer and the vector network and the antenna under test, and is used to complete the control of the antenna under test and the vector network as well as the data feedback.

6. The phased array antenna amplitude and phase testing method according to claim 1, characterized in that: The PC communicates with the ground inspection through the 232 interface and with the vector network through the network port. The PC includes the ground inspection host computer software. The functions of the ground inspection host computer software include: The configuration of the antenna under test, the ground inspection, and the vector network are all performed through the ground inspection host computer software; The ground inspection host computer software can display the status of the antenna under test, the ground inspection status and the vector network status in real time; The ground inspection host computer software can read the amplitude and phase data of each channel and each frequency point returned by the vector network, save them to disk, and process the amplitude and phase data to generate analysis reports and amplitude and phase truth tables. The amplitude and phase truth tables can be sent to the antenna under test to complete the amplitude and phase compensation of the channel.

7. The phased array antenna amplitude and phase testing method according to claim 1, characterized in that: The data stream a is a radio frequency signal, which is output from the vector network port 1 to the test antenna; The data stream b is a radio frequency signal, which is output by the antenna under test and connected to the vector network port 2; The data stream c is a digital signal, which includes the command and timing control signal output by the ground detector to the antenna under test, and the telemetry parameters returned by the antenna under test; The data stream d is a digital signal, the amplitude and phase data returned by the vector network, which is returned to the PC for data processing; The data stream e is a digital signal, which is a synchronization signal output by the ground detector to the vector network, controlling the vector network to perform data sampling according to the timing; The data stream f is a digital signal, which is the remote control and telemetry data between the ground inspection and the PC.

Images