An FFT (fast Fourier transform) based parametric algorithm. rcferred to as MCCLEAN. is devised tor cross-range phase error compensation in SAR (synthetic aperture radar) imaging. It can be used as an independent autofocus approach for the SAR imaging of a large scene. The authors also present a similarly structured algorithm for simultaneous autofocus and super．resolution SAR image formation of a small scene or small region of interest (ROl) in a large scene. Examples are provided to illustrate the performance of the proposed algorithms