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Optical Engineering

Gradient-search phase-retrieval algorithm for inverse synthetic-aperture radar
Author(s): James R. Fienup
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Paper Abstract

We describe a new algorithm for correcting phase errors in synthetic-aperture radar data. It employs a gradient-search algorithm to minimize the energy of the image outside a support constraint. We give analytic expressions for the gradient of the error metric with respect to a point-by-point description of the phase error and with respect to the coefficients of a polynomial expansion of the phase error. These analytic gradients greatly speed the computations for the algorithm. We demonstrate successful phase-error correction for an image of a CV-580 aircraft collected with ERIM's Ground-to-Air Imaging Radar.

Paper Details

Date Published: 1 October 1994
PDF: 6 pages
Opt. Eng. 33(10) doi: 10.1117/12.181247
Published in: Optical Engineering Volume 33, Issue 10
Show Author Affiliations
James R. Fienup, Environmental Research Institute of Michigan (United States)

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