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Proceedings Paper

Implementation of the phase-gradient algorithm
Author(s): Daniel E. Wahl; Paul H. Eichel; Charles V. Jakowatz Jr.
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Paper Abstract

The recently introduced Phase Gradient Autofocus (PGA) algorithm is a non-parametric autofocus technique which has been shown to be quite effective for phase correction of Synthetic Aperture Radar (SAR) imagery. This paper will show that this powerful algorithm can be executed at near real-ume speeds and also be implemented in a relatively small piece of hardware. A briefreview ofthe PGA wiibe presented along with an overview ofsome critical implementation considerations. In addition a demonstration of the PGA algorithm running on a 7" xlO" printed circuit board containing a TMS32OC3O digital signal pro cessing (DSP) chip wilibe given. With this system using only the 20 range bins which contain the brightest points in the image the algorithm can correct a badly degraded 256x256 image in as little as 3 seconds. Using all range bins the algorithm can correct the image in 9 seconds.

Paper Details

Date Published: 1 November 1990
PDF: 8 pages
Proc. SPIE 1348, Advanced Signal Processing Algorithms, Architectures, and Implementations, (1 November 1990); doi: 10.1117/12.23506
Show Author Affiliations
Daniel E. Wahl, Sandia National Labs. (United States)
Paul H. Eichel, Sandia National Labs. (United States)
Charles V. Jakowatz Jr., Sandia National Labs. (United States)

Published in SPIE Proceedings Vol. 1348:
Advanced Signal Processing Algorithms, Architectures, and Implementations
Franklin T. Luk, Editor(s)

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