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Proceedings Paper

Algorithms for focused linear SAR imaging
Author(s): Christopher John Oliver; David P. Belcher; A. P. Blake; Richard Geoffrey White
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Paper Abstract

This paper outlines the methods adopted by the DRA to obtain focused linear synthetic aperture radar (SAR) images from a long- range, airborne, X-band SAR. We compare the theoretical autofocus performance of four algorithms: fitting the target return, phase estimation, contrast optimisation and multilook registration. Residual phase and azimuthal position errors arising from the focus error are derived and the limitations imposed on the four techniques by the actual scene are discussed. The tracking performances of the algorithms are compared at both high and low frequency and a scheme giving a combination of high-frequency tracking with low distortion introduced. These predictions are then compared with typical aircraft instabilities and the compensated motion frequency response derived. Finally, examples from real SAR data are given illustrating the success of these methods, including the residual distortion and the point response function.

Paper Details

Date Published: 9 June 1994
PDF: 12 pages
Proc. SPIE 2230, Algorithms for Synthetic Aperture Radar Imagery, (9 June 1994); doi: 10.1117/12.177196
Show Author Affiliations
Christopher John Oliver, Defence Research Agency Malvern (United Kingdom)
David P. Belcher, Defence Research Agency Malvern (United Kingdom)
A. P. Blake, Defence Research Agency Malvern (United Kingdom)
Richard Geoffrey White, Defence Research Agency Malvern (United Kingdom)

Published in SPIE Proceedings Vol. 2230:
Algorithms for Synthetic Aperture Radar Imagery
Dominick A. Giglio, Editor(s)

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