A Sparse signal representation-based approach to image formation and anisotropy determination in wide-angle radar
Varshney, Kush R. and Çetin, Müjdat and Fisher, III, John W. and Willsky, Alan S. (2007) A Sparse signal representation-based approach to image formation and anisotropy determination in wide-angle radar. In: IEEE Conference on Signal Processing and Communications Applications, Eskişehir, Turkey
Official URL: http://dx.doi.org/10.1109/SIU.2007.4298646
We consider the problem of jointly forming images and determining anisotropy from wide-angle synthetic aperture radar (SAR) measurements. Conventional SAR image formation techniques assume isotropic scattering, which is not valid with wide-angle apertures. We present a method based on a sparse representation of aspect-dependent scattering with an overcomplete dictionary composed of elements with varying levels of angular persistence. Solved as an inverse problem, the result is a complex-valued, aspect-dependent response for each spatial location in a scene. Our formulation leads to an optimization problem for which we develop a tractable, graph-structured approximate algorithm. We present experimental results on realistic electromagnetic simulations demonstrating the effectiveness of the proposed approach.
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