Long-range Target Identification

We propose to develop a new autofocus method applicable to large-scene surveillance with circular SAR. Our work constitutes a continuation, full implementation, and extensions of the new autofocus algorithm we developed and successfully tested during Phase I. The proposed method is applicable to large apertures and corrects effects of fine-scale (sub-wavelength) deviations in the platform motion along arbitrary curved trajectories. The proposed method will be accelerated with suitable fast imaging techniques. It will be also extended to multi-pass circular SAR measurements and augmented with autofocus methods for moving targets. BENEFIT: The proposed method will significantly enhance the capabilities of DoD SAR imaging technology. It will be applicable in a number of commercial and national security surveillance programs, e.g., in border monitoring.