Date of download: 7/7/2016 Copyright © 2016 SPIE. All rights reserved. Evaluation of the orthogonal matching pursuit (OMP) cost over the target space in.

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Date of download: 7/7/2016 Copyright © 2016 SPIE. All rights reserved. Evaluation of the orthogonal matching pursuit (OMP) cost over the target space in a single grid. x, grid center; o, true position of the target. Figure Legend: From: Sparse ground-penetrating radar imaging method for off-the-grid target problem J. Electron. Imaging. 2013;22(2): doi: /1.JEI

Date of download: 7/7/2016 Copyright © 2016 SPIE. All rights reserved. (a) True ground-penetrating radar (GPR) target space with K=3 off-the-grid targets. (b) Gradient-based (GB)-OMP reconstruction result. (c) OMP reconstruction result. Figure Legend: From: Sparse ground-penetrating radar imaging method for off-the-grid target problem J. Electron. Imaging. 2013;22(2): doi: /1.JEI

Date of download: 7/7/2016 Copyright © 2016 SPIE. All rights reserved. (a) Reconstructed target positions with the proposed technique with the underlying grids. ○, correct target parameters; +, parameters found by the proposed method; x, grid centers. (b) Gradient-based steps taken within the proposed algorithm at one of the target grids. Figure Legend: From: Sparse ground-penetrating radar imaging method for off-the-grid target problem J. Electron. Imaging. 2013;22(2): doi: /1.JEI

Date of download: 7/7/2016 Copyright © 2016 SPIE. All rights reserved. GB-OMP results with grid sizes of 5 cm (a) 10 cm (b) and 20 cm (c) Reconstructed OMP images with grid sizes of 5 cm (d) 10 cm (e) and 20 cm (f). Figure Legend: From: Sparse ground-penetrating radar imaging method for off-the-grid target problem J. Electron. Imaging. 2013;22(2): doi: /1.JEI

Date of download: 7/7/2016 Copyright © 2016 SPIE. All rights reserved. (a) Estimated sparsity level of the GB-OMP versus the correct sparsity of the target space. (b) Average location error in dB versus the sparsity level of the scene for OMP and GB-OMP methods. Figure Legend: From: Sparse ground-penetrating radar imaging method for off-the-grid target problem J. Electron. Imaging. 2013;22(2): doi: /1.JEI

Date of download: 7/7/2016 Copyright © 2016 SPIE. All rights reserved. Average location error in dB versus varying levels of SNR. Figure Legend: From: Sparse ground-penetrating radar imaging method for off-the-grid target problem J. Electron. Imaging. 2013;22(2): doi: /1.JEI