We present an autofocus algorithm for Compressed SAR Imaging. The technique estimates and corrects for 1-dphaseerrors in the phase history domain, based on prior knowledge that the reflectivity field is sparse, as i...
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ISBN:
(纸本)9781479974207
We present an autofocus algorithm for Compressed SAR Imaging. The technique estimates and corrects for 1-dphaseerrors in the phase history domain, based on prior knowledge that the reflectivity field is sparse, as in the case of strong scatterers against a weakly-scattering background. The algorithm relies on the Sparsity driven Autofocus (SdA) method and Augmented Lagrangian Methods (ALM), particularly Alternating directions Method of Multipliers (AdMM). In particular, we propose an AdMM-based algorithm that we call Autofocusing Iteratively Re Weighted Augmented Lagrangian Method (AIRWALM) to solve a constrained formulation of the sparsity driven autofocus problem with an fp-norm, p < 1 cost function. We then compare the performance of the proposed algorithm's performance to phase Gradient Autofocus (PGA) and SdA [2] in terms of autofocusing capability, phase error correction, and computation time.
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