Image and Signal Processing Methods

Extraction of target three-dimensional scattering centers from multiaspect synthetic aperture radar data at different azimuths and elevations

[+] Author Affiliations
Jinrong Zhong, Gongjian Wen

National University of Defense Technology, ATR Laboratory, Kaifu District, Changsha 410073, China

J. Appl. Remote Sens. 9(1), 095069 (Jul 20, 2015). doi:10.1117/1.JRS.9.095069
History: Received February 14, 2015; Accepted June 18, 2015
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Abstract.  Additional information provided by three-dimensional (3-D) scattering centers (SCs) is useful in automatic target recognition (ATR). An approach is proposed for 3-D SC extraction from multiple-resolution synthetic aperture radar (SAR) measurements at arbitrary azimuths and elevations. This approach consists of a feature-level extraction and a signal-level optimization. In the feature-level extraction, two-dimensional (2-D) SCs are first extracted at each aspect, then 3-D SCs are coarsely generated from these 2-D SCs by a clustering method. This clustering method contains a particular distance equation and an ingenious clustering strategy which is developed based on some basic properties of scattering physics and the geometric transformation of 3-D SCs and 2-D SCs. Exploiting the sparsity of SCs in the feature domain, such a method efficiently extracts 3-D SCs. In the signal-level optimization, 3-D SC parameters are directly re-estimated using the measurement data. This improves the precision of 3-D SC parameters and provides reliable reconstructions. Finally, the experimental results of data generated by the GTD model and the high-frequency electromagnetic magnetism code exhibit the effectiveness of the proposed approach. In addition, we apply our approach to multiple-pass circle SAR. The reconstructed 3-D SCs exactly depict the shape of the target.

© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Jinrong Zhong and Gongjian Wen
"Extraction of target three-dimensional scattering centers from multiaspect synthetic aperture radar data at different azimuths and elevations", J. Appl. Remote Sens. 9(1), 095069 (Jul 20, 2015). ; http://dx.doi.org/10.1117/1.JRS.9.095069


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