Recent work has revealed that an adaptation of phase gradient autofocus (PGA) techniques can be used to refocus the signature smears induced by moving targets in synthetic aperture radar (SAR) images. In this approach, the residual range migration errors induced by target motion are estimated and corrected within the phase history data (PHD) domain. The resulting quality of the target images generated using this PHD-based autofocus methodology varies according to the selected region-of-interest (ROI) as input into the processing. The present analysis investigates the variation in the quality of the refocused target images with regards to ROI selection.

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David A. Garren, "Effects of region of interest selection on phase history based SAR moving target autofocus," Proc. SPIE 10987, Algorithms for Synthetic Aperture Radar Imagery XXVI, 1098703 (Presented at SPIE Defense + Commercial Sensing: April 18, 2019; Published: 14 May 2019); https://doi.org/10.1117/12.2518435.