Synthetic aperture radar (SAR) image radiation measurement error correction method

Abstract

The invention provides a synthetic aperture radar (SAR) image radiation measurement error correction method, so as to correct influences on the gray scale of the synthetic aperture radar image by weighting of a synthetic aperture radar antenna pattern and attenuation of a propagation distance. The method comprises steps: according to synthetic aperture radar system parameters and geometric parameters, the antenna propagation direction and the propagation slant distance corresponding to each pixel in the synthetic aperture radar image are calculated; according to the synthetic aperture radar antenna pattern data and a propagation distance attenuation law for synthetic aperture radar signals, a pattern weighting correction function and a propagation distance weighting correction function for each pixel in the synthetic aperture radar image are calculated; and according to the pattern weighting correction function and the propagation distance weighting correction function, compensation processing is carried out on the gray scale of each pixel in the synthetic aperture radar image. Thus, when the method of the invention is adopted, influences on the gray scale of the SAR image by factors such as the weighting of the SAR antenna pattern and the attenuation of the propagation distance can be corrected, and the radiation measurement errors of the SAR image can be corrected.

Description

Technical field [0001] The present invention relates to synthetic aperture radar (Synthetic Aperture Radar, hereinafter referred to as SAR) system technology and image processing technology, in particular to a synthetic aperture radar image radiation measurement error correction method for correcting SAR image radiation measurement errors. Background technique [0002] SAR is a kind of microwave imaging radar, which can realize the two-dimensional imaging of the observation scene with the help of the movement of platforms such as satellites and airplanes. The SAR image contains two geometric dimensions: azimuth and distance. The azimuth is the direction of movement of the platform, and the distance is the direction of the radar beam. In the SAR image, different pixels in the upward distance correspond to different beam irradiation directions and different propagation distances. [0003] The SAR image contains the geometric shape information, geometric position information and elec...

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Problems solved by technology

[0006] On the one hand, more attention is paid to the shape and position information in the SAR image, but relatively insufficient attention is paid to the gray level information of the image and the backscattering intensity information of the target represented;

[0007] On the other hand, in most cases, SAR image processing is mainly to meet the needs of human eyes, and its transformation of image grayscale lacks physical basis, which will cause the SAR image grayscale to be unable to truly represent the backscattering intensity of ground objects. information

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