CN111123221A - Active phased array system SAR channel full link amplitude and phase stability test method - Google Patents

Active phased array system SAR channel full link amplitude and phase stability test method Download PDF

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CN111123221A
CN111123221A CN201911276320.9A CN201911276320A CN111123221A CN 111123221 A CN111123221 A CN 111123221A CN 201911276320 A CN201911276320 A CN 201911276320A CN 111123221 A CN111123221 A CN 111123221A
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test
sar
amplitude
channel
antenna
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CN111123221B (en
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陶满意
孙慧峰
胡广清
顾亦磊
党建成
李彪
陆洋
吴侠义
秦冉冉
何海燕
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Shanghai Institute of Satellite Engineering
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/40—Means for monitoring or calibrating
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
    • G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/40—Means for monitoring or calibrating
    • G01S7/4052—Means for monitoring or calibrating by simulation of echoes

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  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

The invention provides a method for testing full-link amplitude-phase stability of an active phased array system SAR channel, which ensures that the position of a microwave probe antenna for testing meets remote testing conditions and is aligned with the position of a selected array surface of an antenna to be tested; disconnecting the antenna array surface calibration network from the port of the inner calibrator, and connecting the port of the inner calibrator with the microwave probe antenna through a high-frequency cable for ground test; setting a satellite-borne SAR system in a single TR test calibration mode, and powering up the whole satellite to record echo data; and performing pulse pressure processing on echo data obtained by the two previous and subsequent tests to obtain amplitude and phase values at peak values, performing amplitude-phase difference of corresponding TR channels, and performing fixed inclination correction and fixed temperature deviation value compensation to obtain amplitude-phase stability test results of the TR channels. The requirements of testing the full-link amplitude-phase stability of the SAR channel of the satellite-borne active phased array system are met.

Description

Active phased array system SAR channel full link amplitude and phase stability test method
Technical Field
The invention relates to the technical field of aerospace communication, in particular to a method for testing the amplitude and phase stability of a full link of an SAR channel of a satellite-borne active phased array system.
Background
The satellite-borne active phased array system Synthetic Aperture Radar (SAR) is an all-weather all-day-around earth observation means, along with the continuous development of the satellite-borne active phased array system SAR technology, the requirements on the efficiency and the precision of ground testing are higher and higher, and in order to realize the high-efficiency testing of the full-link amplitude-phase stability of the satellite-borne active phased array system SAR channel, improvement and development are needed on the basis of an original testing method.
Before the method, a test means of the amplitude-phase stability of the SAR channel of the satellite-borne active phased array system is mainly an internal calibration system, and the internal calibration is an important means for eliminating system errors and improving the quantitative remote sensing performance of the SAR. The main functions of the internal calibration include measuring the amplitude-phase distribution of the TR channel, extracting a system reference function, monitoring the stability of the system reference function and the like. In the existing known satellite-borne SAR adopting an active phased-array antenna, most systems adopt a power distribution network and a coupler to form an antenna wired calibration network, and then complete the calibration of an active transceiving channel of the SAR system by combining with an internal calibrator. The calibration network can be used for the test of the stability of the front channel, but the calibration link has the following disadvantages:
a. the calibration network can only cover the output port of the TR component, cannot cover the connecting joint of the TR component and the radiation array surface, and cannot cover the radiation array surface, so that the radio frequency connection correctness before and after the antenna vibrates cannot be tested;
b. the finally calibrated amplitude-phase data is the transmission effect of the calibration network and the feed network together, and errors introduced by the temperature change characteristic of the calibration network cannot be removed simply.
Before the method, the satellite-borne active phased array system SAR channel amplitude-phase stability test can also obtain accurate channel radiation characteristics through high-precision near-field scanning, but a near-field system needs a high-precision scanning frame and cannot be rapidly deployed in a conventional integrated factory, and the whole SAR satellite system is transported to a microwave darkroom for testing, so that long testing time and complex testing tools are needed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for testing the amplitude and phase stability of a full link of an SAR channel with an active phased array system.
The invention provides a method for testing the amplitude and phase stability of a full link of an active phased array system SAR channel, which comprises the following steps:
the method comprises the following steps: ensuring that the center of the microwave probe antenna is aligned with the position of the array surface point of the selected SAR antenna to be detected, and enabling 3dB wave beams of each TR channel array radiation unit in the area of the array surface to be detected to have intersection with the 3dB wave beams of the microwave probe antenna;
step two: disconnecting the SAR antenna array surface calibration network to be tested from the high-frequency cable of the inner calibrator, and connecting the outer calibration port of the inner calibrator with the microwave probe antenna;
step three: setting an SAR subsystem in a single TR test calibration mode, setting corresponding working bandwidth, powering up a satellite and starting up the satellite and recording the uploaded calibration echo data;
step four: the method comprises the following steps of carrying out two tests, ensuring that the area of a to-be-tested array surface and the alignment point position of the two tests are the same, simultaneously ensuring that the relative position relation between the microwave probe antenna of the two tests and the area of the to-be-tested array surface is controlled within a certain precision requirement range, and avoiding the phase winding of the two tests;
step five: and respectively carrying out pulse pressure processing on the calibration echo data acquired by the two test records, taking the amplitude and phase value of the peak value after pulse pressure of each TR channel, carrying out difference on the two test results, and compensating the fixed inclination component and the fixed integral offset according to the requirement to obtain the full-link amplitude-phase stability test value of each channel.
Preferably, the first step utilizes a far-field test basic principle to realize that each TR channel array radiation unit in the array area to be tested meets a far-field test condition relative to the microwave probe antenna.
Preferably, the centering of the microwave probe antenna to the selected wavefront point location comprises:
each radiation unit on the array surface area of the SAR antenna to be detected needs to meet a far field condition;
the directional diagram main lobe of the microwave probe antenna is positioned in the main lobe of any radiation unit in the surface area of the SAR antenna array to be tested.
Preferably, the second step is to disconnect the high-frequency cable between the SAR antenna calibration network to be tested and the inner calibrator, and connect the inner calibrator and the microwave probe antenna through the high-frequency cable for ground test.
Preferably, the third step selects the SAR subsystem to be in a single TR test calibration mode, only one TR channel is turned on at each pulse time, and simultaneously sets the corresponding working bandwidth, performs the transmission state test and the reception state test respectively, and records the calibration echo data that is transmitted.
Preferably, the fourth step is to perform the test and data recording twice under the same working condition, the area of the array surface to be tested and the alignment point position of the two tests are required to be the same, and the relative position relationship between the microwave probe antenna and the area of the array surface to be tested of the two tests is controlled within a certain precision requirement range.
Preferably, the requirement for controlling the relative position relationship between the microwave probe antenna for two tests and the area of the array surface to be tested is as follows: it is required to satisfy X, Y, Z that the position error in three directions is not more than 1 wavelength to avoid the phase winding phenomenon.
Preferably, the fifth step is to perform pulse pressure processing on the calibration echo data obtained by the two-time test recording, to obtain the amplitude and phase value at the peak after the pulse pressure of each TR channel, and to make a difference between the amplitude and phase results of the two-time test processing of the same TR channel, and meanwhile, because the relative position relationship between the two-time test microwave probe antenna and the area of the array surface to be tested cannot be absolutely consistent, there is an oblique component in the difference result, and a whole fixed offset value is generated due to the temperature change between the two tests, so that the test value of the full-link amplitude-phase stability of each channel can be obtained after the oblique component and the whole fixed offset value are corrected.
Compared with the prior art, the invention has the following beneficial effects:
1. the satellite-borne active phased array system SAR channel full-link amplitude-phase stability testing method aims at single TR channel full-link amplitude-phase characteristic testing, and can make up for the defects that the internal calibration system testing cannot cover the connecting joint of a TR component and a radiation array surface and cannot cover the radiation array surface.
2. The method for testing the full-link amplitude-phase stability of the SAR channel of the satellite-borne active phased array system realizes simple and efficient test through the standard microwave probe antenna, does not need a complicated test tool for testing a near field in a darkroom, greatly reduces time consumption and ensures precision.
3. The method for testing the amplitude-phase stability of the full link of the SAR channels of the satellite-borne active phased array system can realize the acquisition of the amplitude-phase characteristic data of each single TR channel only by selecting the single TR test calibration mode function of the SAR subsystem on the basis of not changing the design of the SAR subsystem.
4. The method for testing the full-link amplitude-phase stability of the SAR channel of the satellite-borne active phased array system mainly solves the problems of high efficiency and universalization of the full-link amplitude-phase stability test of the SAR channel, increases the operations of amplitude phase difference, correcting fixed inclination vectors and supplementing integral fixed offset values only during conventional echo data processing, improves the efficiency of the whole satellite integration test, and greatly saves time.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a flow chart of a method for testing the amplitude and phase stability of a full link of an SAR channel of a satellite-borne active phased array system according to the invention;
fig. 2 is a schematic diagram of the principle of the method for testing the full-link amplitude-phase stability of the SAR channel of the satellite-borne active phased array system.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
As shown in fig. 1, in this embodiment, the method for testing full link amplitude-phase stability of an SAR channel of a satellite-borne active phased array system of the present invention is introduced as follows:
the method comprises the following steps: through the accurate adjustment of the adjustable support, the center of the microwave probe antenna is aligned to the selected position of the array surface point, so that intersection exists between the 3dB wave beam of each TR channel array radiation unit in the area of the array surface to be detected and the 3dB wave beam of the microwave probe antenna;
step two: disconnecting the antenna array surface calibration network from the high-frequency cable of the inner calibrator, and connecting the outer calibration port of the inner calibrator with the microwave probe antenna;
step three: setting an SAR subsystem in a single TR test calibration mode, setting the corresponding working bandwidth of equipment, powering up a satellite, starting the satellite and recording and transmitting calibration echo data;
step four: the method comprises the following steps of carrying out two tests, ensuring that the area of a to-be-tested array surface and the alignment point position of the two tests are the same, simultaneously ensuring that the relative position relation between the microwave probe antenna of the two tests and the area of the to-be-tested array surface is controlled within a certain precision requirement range, and avoiding the phase winding of the two tests;
step five: and respectively carrying out pulse pressure processing on the calibration echo data acquired by the two test records, taking the amplitude and phase value of the peak value after pulse pressure of each TR channel, carrying out difference on the two test results, and compensating the fixed inclination component and the fixed integral offset according to the requirement to obtain the full-link amplitude-phase stability test value of each channel.
The present invention will be described in detail below.
The invention relates to a satellite-borne SAR ground integration test, in particular to a high-efficiency and universal technology for testing the full-link amplitude-phase stability of a satellite-borne active phased array system SAR channel, which relates to the channel characteristic test processing in the satellite-borne SAR ground satellite-mounted integration test process, and discloses a satellite-borne active phased array system SAR channel full-link amplitude-phase stability test method based on a far-field test principle, an adjustable bracket, a standard microwave probe antenna and a single TR test calibration working mode, wherein the method comprises the steps of adjusting the bracket to ensure that the position of a microwave probe antenna for test meets remote test conditions and aligns to the position of a selected array surface point of an antenna to be tested; disconnecting the antenna array surface calibration network from the port of the inner calibrator, and connecting the port of the inner calibrator with the microwave probe antenna through a high-frequency cable for ground test; setting a satellite-borne SAR system in a single TR test calibration mode, and powering up the whole satellite to record echo data; and performing pulse pressure processing on echo data obtained by two times of tests, taking amplitude and phase values at peak values, performing amplitude-phase difference of corresponding TR channels, and performing fixed inclination correction and fixed temperature deviation value compensation. The invention aims to provide a method for testing the amplitude-phase stability of a full link of an SAR channel of a satellite-borne active phased array system, which realizes the test of the amplitude-phase characteristic of the full link of the SAR channel of the satellite-borne active phased array system and realizes the high efficiency and the generalization of the test method.
The invention relates to a method for testing the amplitude and phase stability of a full link of an SAR channel of a satellite-borne active phased array system, which comprises the following steps:
the method comprises the following steps: through the accurate adjustment of the adjustable support, the center of the microwave probe antenna is aligned to the selected position of the array surface point, so that intersection exists between the 3dB wave beam of each TR channel array radiation unit in the area of the array surface to be detected and the 3dB wave beam of the microwave probe antenna;
step two: disconnecting the antenna array surface calibration network from the high-frequency cable of the inner calibrator, and connecting the outer calibration port of the inner calibrator with the microwave probe antenna;
step three: setting an SAR subsystem in a single TR test calibration mode, setting the corresponding working bandwidth of equipment, powering up a satellite to start up and recording the uploaded calibration echo data;
step four: the method comprises the following steps of carrying out two tests, ensuring that the area of a to-be-tested array surface and the alignment point position of the two tests are the same, simultaneously ensuring that the relative position relation between the microwave probe antenna of the two tests and the area of the to-be-tested array surface is controlled within a certain precision requirement range, and avoiding the phase winding of the two tests;
step five: and respectively carrying out pulse pressure processing on the calibration echo data acquired by the two test records, taking the amplitude and phase value of the peak value after pulse pressure of each TR channel, carrying out difference on the two test results, and compensating the fixed inclination component and the fixed integral offset according to the requirement to obtain the full-link amplitude-phase stability test value of each channel.
The first step is to realize that the array radiation unit corresponding to each TR channel meets far-field test conditions relative to the microwave probe antenna by using a far-field test basic principle. For the SAR antenna array surface area to be tested, the limitation of factory space exists, the microwave probe antenna test cannot meet the far field condition, but each radiation unit on the antenna array surface area to be tested needs to meet the far field condition. Meanwhile, in order to ensure the test precision, the main lobe of the directional diagram of the microwave probe antenna must be positioned in the main lobe of any radiation unit in the area of the array surface of the SAR antenna to be tested, and theoretically, 3dB of the main lobe of the microwave probe antenna is required to be overlapped with 3dB of the main lobe of the radiation unit at the edge of the area of the array surface of the SAR antenna to be tested.
And step two, disconnecting the high-frequency cable between the SAR antenna calibration network and the inner stator, and connecting the inner stator and the microwave probe antenna through the high-frequency cable for ground test to realize that the microwave probe antenna test system replaces the calibration network.
Setting the SAR subsystem to work in a single TR test calibration mode, namely, only one TR channel is in a transmitting state or a receiving state at each pulse moment, and the rest TR channels are in a loading state; and meanwhile, setting corresponding working bandwidth, powering up the whole satellite, and recording the uploaded calibration echo data.
And step four, carrying out testing and data recording twice under the same working condition, wherein the area of the array surface to be tested and the alignment point position of the two times of testing are required to be the same, and the relative position relation between the microwave probe antenna and the area of the array surface to be tested of the two times of testing is controlled within a certain precision requirement range.
The relative position relation between the microwave probe antenna for the two tests and the array surface area to be tested is controlled to be within a certain precision requirement: it is required to satisfy X, Y, Z that the position error in three directions is not more than 1 wavelength to avoid the phase winding phenomenon.
And fifthly, respectively carrying out pulse pressure processing on the calibration echo data acquired by the two-time test record, taking the amplitude and phase value at the peak value after pulse pressure of each TR channel, and carrying out subtraction on the amplitude and phase results of the two-time test processing of the same TR channel, wherein the subtraction result has an inclined component due to the fact that the relative position relationship between the antenna of the microwave probe tested for two times and the area of the array surface to be tested cannot be absolutely consistent, and an integral fixed offset value is generated due to the temperature change factor between the two times of test, so that the amplitude and phase stability test value of the full link of each channel can be obtained after the inclined component and the integral fixed offset value are corrected.
More specifically, the main content of the invention is as follows:
1. microwave probe antenna placement and precision alignment
As shown in fig. 2, the layout of the microwave probe antenna should meet the requirements of far-field test conditions and test accuracy, and firstly, the distance d between the microwave probe antenna and each radiation unit of the array surface area to be tested should meet the far-field conditions; secondly, the directional diagram main lobe of the microwave probe antenna must be positioned in the main lobe of any radiation unit in the SAR antenna array surface area to be measured, and theoretically, 3dB of the microwave probe antenna main lobe is required to be overlapped with 3dB of the radiation unit main lobe at the edge of the SAR antenna array surface area to be measured.
In order to ensure comparability of two tests, the relative position relationship between the microwave probe antenna needing two tests and the area of the array surface to be tested is kept consistent, and the position errors of the microwave probe antenna arranged twice in three directions relative to X, Y, Z of the array surface of the SAR antenna are required to be not more than 1 wavelength, so that the phase winding phenomenon is avoided.
2. Operating mode setting
In order to improve the testing efficiency and the testing precision, a single TR testing calibration working mode is selected, and the working bandwidth of the SAR subsystem is set, so that the time-sharing work of each single TR channel can be realized, and the amplitude-phase characteristic test of the full bandwidth of the full link of each single TR channel is carried out one by one.
3. Data processing
Firstly, carrying out data format conversion on calibration echo data recorded and transmitted to obtain echo complex data, and carrying out FFT (fast Fourier transform) conversion, wherein the frequency domain data of each TR (transmitter-receiver) channel tested twice is S11_int(f)、S12_int(f)……S1N_int(f) And S21_int(f)、S22_int(f)……S2N_int(f) Wherein N represents the number of TR channels; secondly, respectively carrying out matched filtering processing with matched filtering function of H (f), and respectively outputting the two test data after matched pulse pressure as S1_out(f)＝[S11_int(f)·H(f)；S12_int(f)·H(f)；……；S1N_int(f)·H(f)]And S2_out(f)＝[S21_int(f)·H(f)；S22_int(f)·H(f)；……；S2N_int(f)·H(f)](ii) a Then, after the data pulse pressure of each TR channel tested twice, carrying out interpolation processing to obtain amplitude values and phase values at peak values, wherein the amplitude values at the peak values of each TR channel tested twice are respectively F1＝[F11_max,F12_max,……,F1N_max]And F2＝[F21_max,F22_max,……,F2N_max]The phase value at the peak value of each TR channel tested twice is P1＝[P11_max,P12_max,……,P1N_max]And P2＝[P21_max,P22_max,……,P2N_max]The amplitude variation test quantity value is delta F ═ F1-F2And the phase change test quantity value delta P is equal to P1-P2(ii) a And finally, performing fixed tendency component correction and integral fixed drift value correction on the amplitude-phase data subjected to the difference to obtain a real amplitude-phase stability change test value.
In conclusion, the method for testing the full-link amplitude-phase stability of the satellite-borne active phased array system SAR channel mainly completes the amplitude-phase stability test of each TR channel in the satellite-mounting integration process of the phased array system SAR, comprises the amplitude-phase performance test before and after the whole satellite vibration test and the amplitude-phase change test caused by product mounting and dismounting, solves the problem of flexible deployment in near field, realizes the precision equivalent to the microwave darkroom near-field scanning test, overcomes the defects that the inner calibration system cannot cover the connecting joint of the TR component and the radiation array surface and cannot cover the radiation array surface, realizes the efficient and rapid antenna calibration test verification in the whole satellite state, so as to check the amplitude-phase change condition caused in the process of the SAR antenna TR channel full link satellite-loading integration test, the requirements of high efficiency and generalization of the satellite-borne SAR ground satellite-mounted integrated test system are met, and the efficiency of the whole satellite integrated test is greatly improved.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims (8)

1. A method for testing full-link amplitude-phase stability of an active phased array system SAR channel is characterized by comprising the following steps:
the method comprises the following steps: ensuring that the center of the microwave probe antenna is aligned with the position of the array surface point of the selected SAR antenna to be detected, and enabling 3dB wave beams of each TR channel array radiation unit in the area of the array surface to be detected to have intersection with the 3dB wave beams of the microwave probe antenna;
step two: disconnecting the SAR antenna array surface calibration network to be tested from the high-frequency cable of the inner calibrator, and connecting the outer calibration port of the inner calibrator with the microwave probe antenna;
step three: setting an SAR subsystem in a single TR test calibration mode, setting corresponding working bandwidth, powering up a satellite and starting up the satellite and recording the uploaded calibration echo data;
step four: the method comprises the following steps of carrying out two tests, ensuring that the area of a to-be-tested array surface and the alignment point position of the two tests are the same, simultaneously ensuring that the relative position relation between the microwave probe antenna of the two tests and the area of the to-be-tested array surface is controlled within a certain precision requirement range, and avoiding the phase winding of the two tests;
step five: and respectively carrying out pulse pressure processing on the calibration echo data acquired by the two test records, taking the amplitude and phase value of the peak value after pulse pressure of each TR channel, carrying out difference on the two test results, and compensating the fixed inclination component and the fixed integral offset according to the requirement to obtain the full-link amplitude-phase stability test value of each channel.
2. The method for testing full-link amplitude-phase stability of the active phased array system SAR channel according to claim 1, characterized in that the first step utilizes a far-field test basic principle to realize that each TR channel array radiation unit in an array area to be tested meets far-field test conditions relative to a microwave probe antenna.
3. The method for testing the full-link amplitude-phase stability of the active phased array system SAR channel according to claim 2, wherein the step of aligning the center of the microwave probe antenna with the selected wavefront point comprises the following steps:
each radiation unit on the array surface area of the SAR antenna to be detected needs to meet a far field condition;
the directional diagram main lobe of the microwave probe antenna is positioned in the main lobe of any radiation unit in the surface area of the SAR antenna array to be tested.
4. The method for testing the full-link amplitude-phase stability of the SAR channel of the active phased array system according to claim 1, wherein in the second step, a high-frequency cable between the calibration network of the SAR antenna to be tested and the internal calibrator is disconnected, and the internal calibrator and the microwave probe antenna are connected through the high-frequency cable for ground test.
5. The method for testing full-link amplitude-phase stability of the active phased array system SAR channel according to claim 1, characterized in that, in the third step, the SAR subsystem is selected to be in a single TR test calibration mode, only one TR channel is started at each pulse time, corresponding working bandwidths are set simultaneously, a transmitting state test and a receiving state test are respectively carried out, and calibration echo data which are transmitted are recorded.
6. The method for testing the full-link amplitude-phase stability of the active phased array system SAR channel according to claim 1, characterized in that, the fourth step is to perform the test and data recording twice under the same working condition, the area of the array surface to be tested and the alignment point position of the two tests are required to be the same, and the relative position relationship between the microwave probe antenna and the area of the array surface to be tested of the two tests is controlled within a certain precision requirement range.
7. The method for testing the full-link amplitude-phase stability of the SAR channel in the active phased array system according to claim 6, wherein the control requirement of the relative position relationship between the microwave probe antenna and the array surface area to be tested in the two tests is as follows: it is required to satisfy X, Y, Z that the position error in three directions is not more than 1 wavelength to avoid the phase winding phenomenon.
8. The active phased array system SAR channel full link amplitude and phase stability test method according to claim 6, characterized in that, the fifth step is to perform pulse pressure processing on the calibration echo data obtained by the two test records, to obtain the amplitude and phase value at the peak after pulse pressure of each TR channel, and to make a difference on the amplitude and phase result of the two test processes of the same TR channel, and meanwhile, because the relative position relationship between the two test microwave probe antennas and the area of the array surface to be tested can not be absolutely consistent, there is an inclined component in the difference result, and an integral fixed offset value can be generated by the temperature change between the two tests, so that the amplitude and phase stability test value of each channel full link can be obtained after the inclined component and the integral fixed offset value are corrected.
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CN114185017A (en) * 2022-02-16 2022-03-15 中国科学院空天信息创新研究院 Method for controlling amplitude-phase error of active feed of azimuth multi-channel antenna
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