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Proceedings Paper

Gradient projection for interrupted SAR using the polar format algorithm
Author(s): Ross Deming; Chad Knight; Jake Gunther
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Paper Abstract

We present an efficient and computationally simple approach for synthetic aperture radar (SAR) imaging in cases when the radar data have gaps, due to missing pulses and/or notches in the frequency band. Our method is a simple variation of gradient projection, in which the search path in each iteration is obtained by projecting the negative-gradient of the L1 norm onto a hyper-plane defining solutions which are consistent with the data. The computations are not complicated since the L1 gradient is simply equal to the sign() of the pixels in the image. Computational efficiency is obtained by incorporating the polar format algorithm, which accomplishes the projection operation using a fast Fourier transform. Sample results are presented using the AFRL Gotcha 2006 radar data set and the Space Dynamics Laboratory FlexSAR system.

Paper Details

Date Published: 19 May 2015
PDF: 14 pages
Proc. SPIE 9475, Algorithms for Synthetic Aperture Radar Imagery XXII, 947504 (19 May 2015); doi: 10.1117/12.2177240
Show Author Affiliations
Ross Deming, Solid State Scientific Corp. (United States)
Chad Knight, Space Dynamics Lab. (United States)
Jake Gunther, Utah State Univ. (United States)

Published in SPIE Proceedings Vol. 9475:
Algorithms for Synthetic Aperture Radar Imagery XXII
Edmund Zelnio; Frederick D. Garber, Editor(s)

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