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Due to uncertainty on target's motion, the range cell migration (RCM) andazimuth phase error (APE) of moving targets can't be completely compensated insynthetic aperture radar (SAR) processing. Therefore, moving targets oftenappear two-dimensional (2-D) defocused in SAR images. In this paper, a 2-Dautofocus method for refocusing defocused moving targets in SAR images ispresented. The new method only requires a direct estimate of APE, while theresidual 2-D phase error ( or RCM) is computed from the estimated APE byexploiting the analytical relationship between the 2-D phase error ( or RCM)and APE. Because the parameter estimation is performed in the reduced-dimensionspace by exploiting prior knowledge on phase error structure, the proposedapproach offers clear advantages in both computational efficiency andestimation accuracy.

SAR Imaging of Moving Target based on Knowledge-aided Two-dimensional Autofocus