High-resolution spaceborne SAR imaging quality improvement method

Abstract

The invention provides an imaging quality improving method of a high-resolution spaceborne SAR. The method comprises the following steps that 1) imaging quality improving demands are analyzed and imaging quality indexes are arranged on the basis of a high-resolution SAR image application; 2) optimized imaging quality indexes are decomposed and distributed; 3) measures for improving the imaging quality are provided; and 4) the imaging quality improving effect is evaluated on the basis of full-link simulation. The method provided by the invention is clear in processes and easy to realize, can guide general design of the spaceborne SAR, is innovative, and is suitable for imaging quality improving researches of other types of SAR satellites.

Description

technical field [0001] The invention relates to the technical field of aerospace systems, in particular to a method for improving the imaging quality of high-resolution spaceborne SAR. Background technique [0002] Since NASA launched the first Synthetic Aperture Radar (SAR) satellite in 1978, more than 50 radar satellites have been launched and in orbit. Synthetic aperture radar satellites have been paid attention to and vigorously developed by various scientific and technological powers because of their unique characteristics of all-weather and all-weather earth observation. High-resolution SAR satellites have always been the focus and difficulty of development, and also the main direction of radar satellite development. [0003] According to the U.S. reconnaissance and surveillance requirements for SAR image resolution, the resolution should be better than 0.9m for battlefield target discovery; the resolution should be better than 0.6m for target identification; the reso...

AI Technical Summary

Problems solved by technology

[0006] 2. The signal-to-noise ratio of some spaceborne SAR images is poor, which affects the detection ability of the target on the image, mainly because the system sensitivity is not high enough, so it is necessary to improve the system sensitivity index

[0007] 3. The "scallop effect" of uneven radiation between sub-strips in the SCANSAR image is mainly caused by the satellite attitude error and beam pointing error, so the radiation accuracy needs to be improved

In the field of spaceborne SAR at home and abroad, there has been a lack of a general method for improving the quality of high-resolution spaceborne SAR imaging to guide the design of quality indicators for spaceborne SAR imaging.

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