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An Accelerated Nonlinear Contrast Source Inversion Scheme for Sparse Electromagnetic Imaging
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DOI：10.1109/ACCESS.2021.3071397.png)
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Abstract
En 中文
An efficient nonlinear contrast source inversion scheme for electromagnetic imaging of sparse two-dimensional investigation domains is proposed. To avoid generating a sequence of linear sparse optimization problems, the non-linearity is directly tackled using the nonlinear Landweber (NLW) iterations. A self-adaptive projected accelerated steepest descent (A-PASD) algorithm is incorporated to enhance the efficiency of the NLW iterations. The algorithm enforces the sparsity constraint by projecting the result of each steepest descent iteration into the L-1 -norm ball and selects the largest-possible iteration step without sacrificing from convergence. Numerical results, which demonstrate the proposed scheme's accuracy, efficiency, and applicability, are presented.
Keywords:
Contrast source inversion
electromagnetic imaging
inverse problems
Landweber iterations
nonlinear inverse scattering
sparse reconstruction
steepest descent algorithm
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