Amplitude and Phase Stability Test Method for Full Link of Active Phased Array System SAR Channel

Abstract

The invention provides a method for testing the amplitude and phase stability of the full link of the active phased array system SAR channel, which ensures that the position of the microwave probe antenna used for testing meets the remote test conditions and is aligned with the selected antenna array point to be tested; Connect the antenna array calibration network to the port of the internal calibrator, and connect the internal calibrator port with the microwave probe antenna through the ground test with a high-frequency cable; set the spaceborne SAR system in the single TR test calibration mode and perform the whole satellite addition. Start the electric machine to record the echo data; perform pulse pressure processing on the echo data obtained from the previous two tests to obtain the amplitude and phase value at the peak value, perform amplitude and phase difference of the corresponding TR channel, and perform fixed tilt correction and fixed temperature offset value Compensation can get the amplitude and phase stability test results of each TR channel. It meets the requirements of the full-link amplitude and phase stability test of the SAR channel of the spaceborne active phased array system.

Description

technical field [0001] The invention relates to the technical field of aerospace communication, in particular to a method for testing the full-link amplitude and phase stability of a SAR channel in a space-borne active phased array system. Background technique [0002] Spaceborne active phased array synthetic aperture radar (SAR) is an all-weather and all-weather means of earth observation. With the continuous development of spaceborne active phased array system SAR technology, the efficiency and accuracy of ground testing The requirements are getting higher and higher. In order to realize the high-efficiency test of the amplitude and phase stability of the full-link SAR channel of the spaceborne active phased array system, it is necessary to improve and develop on the basis of the original test method. [0003] Before the present invention, the testing method of the amplitude and phase stability of the SAR channel in the spaceborne active phased array system is mainly an in...

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Problems solved by technology

[0004] a. The calibration network can only cover the output port of the TR component, and cannot cover the connection joint between the TR component and the radiation front, nor can it cover the radiation front, so the correctness of the RF connection before and after the antenna vibration cannot be tested;

[0005] b. The amplitude and phase data of the final calibration is the transmission effect of the calibration network and the feed network together, and the error introduced by the temperature change characteristics of the calibration network itself cannot be easily removed

[0006] Before the present invention, the test of the amplitude and phase stability of the SAR channel of the space-borne active phased array system can also be scanned by high-precision near-field to obtain accurate channel radiation characteristics, but the near-field system requires a high-precision scanning frame, which can be used in conventional integration It cannot be quickly deployed in the factory building, and transporting the entire SAR satellite system to the microwave anechoic chamber for testing requires a long test time and complicated test equipment

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