Method and system for determining scattering characteristics of synthetic aperture radar image

Abstract

The invention relates to a method and system for determining scattering characteristics of a synthetic aperture radar image. The method comprises the steps of S1, acquiring first image data and secondimage data generated by a satellite for the same scene in adjacent revisit periods under the condition that imaging parameters are not changed, wherein the revisit periods are the minimum time interval for generating the first image data and the second image data; S2, adjusting a scaler placement position and a target body placement position based on the first image data and the second image data; and S3, determining the scattering intensity of the target body as the scattering characteristic by analyzing the scene and absolutely calibrating the image radiation by using the adjusted scaler placement position and the adjusted target body placement position. The method can ensure the consistency of the radiation precision at each point in the imaging range under the condition of high resolution.

Description

technical field [0001] The present disclosure relates to the field of image processing, and more particularly, to a method and system for determining scattering properties of a synthetic aperture radar image. Background technique [0002] The Gaofen-3 Synthetic Aperture Radar (SAR) satellite launched by my country operates in the C-band, with a center frequency of 5.4G, and has 12 imaging modes; the highest resolution can reach 1 meter, using sliding beamforming ( Spotlight) mode is implemented by imaging. In the SAR image with a resolution of 1 meter, the contours of artificial targets such as ships, large vehicles, aircraft, and buildings on the earth's surface can be discerned. The automatic detectability of ground artificial targets in SAR images is affected by the background clutter intensity. The identifiability and recognition of ground artificial target types are affected by the target's own radar imaging characteristics (incident angle, azimuth angle). Considering...

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Problems solved by technology

If the analysis and measurement of target characteristics are carried out, foreign commercial satellite data are used, and the data cost is expensive, and the original data are backed up abroad, which is not conducive to the protection of the property rights of my country's own experimental measurement data

[0010] In order to realize the analysis and measurement of radar scattering characteristics of artificial targets such as vehicles, aircraft, buildings and other targets using the one-meter resolution data of my country's Gaofen-3 SAR satellite, it i

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