Geometric distortion correction in the circular scanning SAR imaging processing

Abstract:

Circular scanning Synthetic Aperture Radar(SAR) works in beam-scan mode，whose radar antenna conically scans with respect to the vertical direction，so that the images of full circular area around the radar platform can be formed. The geometric distortion correction of the images processed by an airborne circular scanning SAR was investigated. While the radar antenna was scanning，the imaging geometry also changed with time. After discussing the mechanism of geometric distortion，a method of geometric distortion correction based on geographic coordinate of subimage’s pixel was put forward. Live data processing validated the method proposed，and SAR image without geometric distortion was obtained.