A method for SAR image terrain radiation correction considering superposition and shadow area

Abstract

This invention relates to the field of SAR image processing technology, specifically disclosing a SAR image topographic radiometric correction method that takes into account overlapping and shadowed areas. The method includes acquiring SAR images, DEM images, and source files within the study area; performing multi-view processing on the original SAR images, resampling the DEM images, and performing radiometric calibration; using an indirect positioning method to perform geometric positioning based on an RD model, generating lookup tables A and B, and registering the images; detecting pixels in overlapping and shadowed areas; calculating the effective scattering area corresponding to each SAR pixel; performing radiometric correction based on the effective scattering area, repairing the backscattering coefficient values ​​in shadowed areas, and finally performing geometric correction. This invention, to a certain extent, eliminates the topographic effects caused by the SAR imaging mechanism and terrain undulations, improving the radiometric correction effect in areas with large topographic undulations. The corrected product can be widely used in fields such as ground feature inversion and classification, deformation detection, and target detection.

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