Gradient projection for interrupted SAR using the polar format algorithm

Ross Deming; Chad Knight; Jake Gunther

doi:10.1117/12.2177240

19 May 2015 Gradient projection for interrupted SAR using the polar format algorithm

Ross Deming, Chad Knight, Jake Gunther

Proceedings Volume 9475, Algorithms for Synthetic Aperture Radar Imagery XXII; 947504 (2015) https://doi.org/10.1117/12.2177240
Event: SPIE Defense + Security, 2015, Baltimore, MD, United States

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.

Citation Download Citation

Ross Deming, Chad Knight, and Jake Gunther "Gradient projection for interrupted SAR using the polar format algorithm", Proc. SPIE 9475, Algorithms for Synthetic Aperture Radar Imagery XXII, 947504 (19 May 2015); https://doi.org/10.1117/12.2177240

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