Gradient-search phase-retrieval algorithm for inverse synthetic-aperture radar

James R. Fienup

doi:10.1117/12.181247

1 October 1994 Gradient-search phase-retrieval algorithm for inverse synthetic-aperture radar

James R. Fienup

Author Affiliations +

Optical Engineering, Vol. 33, Issue 10, (October 1994). https://doi.org/10.1117/12.181247

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.

Citation Download Citation

James R. Fienup "Gradient-search phase-retrieval algorithm for inverse synthetic-aperture radar," Optical Engineering 33(10), (1 October 1994). https://doi.org/10.1117/12.181247

Published: 1 October 1994

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