Image and Signal Processing Methods

Imaging method for downward-looking sparse linear array three-dimensional synthetic aperture radar based on reweighted atomic norm

[+] Author Affiliations
Qian Bao, Yun Lin, Bingchen Zhang, Wen Hong

Chinese Academy of Sciences, Institute of Electronics, Science and Technology on Microwave Imaging Laboratory, North 4th Ring Road West, Beijing 100190, China

Kuoye Han

Information System Technology Institute, Information Science Academy of China Electronics Technology Group Corporation, Beijing 100086, China

Jianguo Liu

Imperial College London, Department of Earth Science and Engineering, South Kensington Campus, London SW7 2AZ, United Kingdom

J. Appl. Remote Sens. 10(1), 015008 (Jan 29, 2016). doi:10.1117/1.JRS.10.015008
History: Received September 19, 2015; Accepted January 6, 2016
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Abstract.  We propose an imaging algorithm for downward-looking sparse linear array three-dimensional synthetic aperture radar (DLSLA 3-D SAR) in the circumstance of cross-track sparse and nonuniform array configuration. Considering the off-grid effect and the resolution improvement, the algorithm combines pseudo-polar formatting algorithm, reweighed atomic norm minimization (RANM), and a parametric relaxation-based cyclic approach (RELAX) to improve the imaging performance with a reduced number of array antennas. RANM is employed in the cross-track imaging after pseudo-polar formatting the DLSLA 3-D SAR echo signal, then the reconstructed results are refined by RELAX. By taking advantage of the reweighted scheme, RANM can improve the resolution of the atomic norm minimization, and outperforms discretized compressive sensing schemes that suffer from off-grid effect. The simulated and real data experiments of DLSLA 3-D SAR verify the performance of the proposed algorithm.

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Citation

Qian Bao ; Kuoye Han ; Yun Lin ; Bingchen Zhang ; Jianguo Liu, et al.
"Imaging method for downward-looking sparse linear array three-dimensional synthetic aperture radar based on reweighted atomic norm", J. Appl. Remote Sens. 10(1), 015008 (Jan 29, 2016). ; http://dx.doi.org/10.1117/1.JRS.10.015008


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