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Proceedings Paper

An efficient means to mitigate wavefront curvature effects in polar format processed SAR imagery
Author(s): Robert Linnehan; Mark Yasuda; Armin Doerry
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Paper Abstract

Synthetic aperture radar (SAR) images processed using the polar format algorithm (PFA) may exhibit distortion if the curvature of the spherical wavefronts are not accounted for. The distortion manifests in geometric shifts and defocusing of targets, and intensifies as distances between pixels and the scene reference position increase. In this work, we demonstrate a method to mitigate the effects of wavefront curvature by applying localized (space-variant) phase corrections to sub-regions selected from the polar format processed image. The modified sub-images are then reassembled into a full image. To minimize discontinuities in the reconstructed image, the spatially variant phase adjustments are made to regions larger than the sub-images, and pared down before being reinserted into the complete image. The result is a SAR process that retains the efficiency of the PFA, yet avoids scene size limitations due to wavefront curvature distortions. The method is illustrated and validated using simulations and real data collected by the General Atomics Aeronautical Systems, Inc. (GA-ASI) Lynx® Multi-mode Radar System.

Paper Details

Date Published: 3 May 2012
PDF: 9 pages
Proc. SPIE 8361, Radar Sensor Technology XVI, 83611N (3 May 2012); doi: 10.1117/12.930118
Show Author Affiliations
Robert Linnehan, General Atomics Aeronautical Systems, Inc. (United States)
Mark Yasuda, General Atomics Aeronautical Systems, Inc. (United States)
Armin Doerry, Sandia National Labs. (United States)

Published in SPIE Proceedings Vol. 8361:
Radar Sensor Technology XVI
Kenneth I. Ranney; Armin W. Doerry, Editor(s)

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