Stripmap SAS Autofocus Based on Strong Targets
Abstract：In synthetic aperture imaging,autofocus is used to correct the residual phase error. Phase curvature autofocus is a typical autofocus method for stripmap SAR The algorithm estimates phase curvature of the aperture of each strong target, and phase error is derived via double integration of the phase curvature of the whole aperture In SAS imaging, strong targets are blurred in both azimuth and range direction which leads to the failure of PCA use in stripmap gAS autdocus. In this paper LFM signal with phase error is derived according to the range migration trajectory of the strong target, and phase curvature can be got after the signal related to strong target is dechirped. The phase curvatures are double integrated and sway error can be derived. Simulation result shows that the improve algorithm can he applied in stripmap SAS autofocus.
Keywords：Stripmap SASphase errorstrong targetsphase curvature autofocus
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：3( 51-52,149 )