Title :
Autofocus algorithm for SAR imagery based on sharpness optimisation
Author :
Yang Gao ; Weidong Yu ; Yabo Liu ; Wang, Ruiqi
Author_Institution :
Lab. 6, Inst. of Electron., Beijing, China
Abstract :
To focus synthetic aperture radar data suffering from phase errors, a novel autofocus algorithm is presented. The algorithm uses the coordinate descent technique to estimate the phase errors for maximum sharpness autofocus, where analytical-form expressions are easy to find for the optimal estimates on a per-parameter basis. Experimental results show the validity of the proposed algorithm.
Keywords :
optimisation; phase estimation; radar imaging; synthetic aperture radar; SAR imagery; analytical-form expression; coordinate descent technique; maximum sharpness autofocus error; per-parameter estimation; phase error estimation; sharpness optimisation; synthetic aperture radar;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2013.4111
