Maximizing Sum of Image Intensity Square Autofocus Algorithm

This High quality Synthetic Aperture Radar (SAR) imaging requires that azimuth frequency modulation rate is accurately estimated. A new algorithm is proposed for autofocus in synthetic aperture radar imaging. Based on image contrast, the paper analyses the relationship between maximizing sum of image intensity square and image contrast function, and maximizing sum of image intensity square autofocus algorithm is presented. Then the bisection which substitutes for advance and retreat method reduces computation. The processing results of the measured data shows better convergence speed of bisection and the validity of the proposed algorithm.