Method for optimizing SAR antenna directional diagram test

Abstract

The invention discloses a method for optimizing an SAR antenna directional diagram test. The method includes the steps of establishing an active phased array antenna directional diagram calculating mathematics model according to the electromagnetic field theory, obtaining and calculating basic data of an active phased array antenna, calculating and storing all wave position antenna amplitude phase weight coefficients of the SAR antenna according to the design requirement and engineering realizability, and using a near-field test method to obtain antenna sub-array directional diagrams at different positions of an antenna array plane under a planar near-field test system environment. The test time of an SAR antenna directional diagram test is greatly shortened, the satellite development progress is ensured and accelerated and a reference is provided for test SAR antenna directional diagram of subsequent radar satellite models.

Description

technical field

[0001] The invention relates to an optimization method, in particular to a method for optimizing the SAR antenna pattern test. Background technique

[0002] With the rapid development of Synthetic Aperture Radar (SAR), my country's first high-resolution X-band active planar phased array SAR satellite came into being. The satellite has right-view and left-view imaging capabilities, and there are four working modes in each side-view state. The antenna beams of the spotlight mode and the scanning mode not only need to change the angle of view in the range direction, but also need to scan in the azimuth direction. Due to the coupling of the range direction and the azimuth direction, the wave number in these two modes is equal to the multiplication of the wave number in the range direction. The number of wave positions in the azimuth direction increases significantly; in order to make the target located in the center of the imaging zone as much as possible, the o...

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