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Proceedings Paper

Comparison of synthetic-aperture radar autofocus techniques: phase gradient versus subaperture
Author(s): Terry M. Calloway; Charles V. Jakowatz Jr.; Paul A. Thompson; Paul H. Eichel
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Paper Abstract

Two methods of focusing synthetic aperture radar (SAR) images are compared. Both a conventional subaperture cross-correlation method and a new phase gradient autofocus (PGA) algorithm developed at Sandia National Laboratories are shown to perform well if high-order phase errors are not present. With the introduction of significant high-order phase errors [e.g., due to uncompensated platform motion], both algorithms suffer a loss in performance. However, relative performance degradation is less for PGA than for the subaperture focusing technique. An explanation is presented for the observed behavior of the two autofocus techniques.

Paper Details

Date Published: 1 December 1991
PDF: 12 pages
Proc. SPIE 1566, Advanced Signal Processing Algorithms, Architectures, and Implementations II, (1 December 1991); doi: 10.1117/12.49837
Show Author Affiliations
Terry M. Calloway, Sandia National Labs. (United States)
Charles V. Jakowatz Jr., Sandia National Labs. (United States)
Paul A. Thompson, Sandia National Labs. (United States)
Paul H. Eichel, Sandia National Labs. (United States)

Published in SPIE Proceedings Vol. 1566:
Advanced Signal Processing Algorithms, Architectures, and Implementations II
Franklin T. Luk, Editor(s)

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