Azimuth-range decouple-based L1 regularization method for wide ScanSAR imaging via extended chirp scaling

Hui Bi; Bingchen Zhang; XiaoXiang Zhu; Wen Hong

doi:10.1117/1.JRS.11.015007

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24 January 2017 Azimuth-range decouple-based L₁ regularization method for wide ScanSAR imaging via extended chirp scaling

Hui Bi, Bingchen Zhang, XiaoXiang Zhu, Wen Hong

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Journal of Applied Remote Sensing, Vol. 11, Issue 1, 015007 (January 2017). https://doi.org/10.1117/1.JRS.11.015007

Abstract

In this paper, we proposed an azimuth-range decouple-based L₁ regularization method for wide ScanSAR imaging via extended chirp scaling (ECS) and applied it to the TerraSAR-X data to achieve large-scale sparse reconstruction. Compared with ECS, the conventional ScanSAR imaging algorithm based on matched filtering, the proposed method can improve the synthetic aperture radar image performance with full-sampling raw data for not only sparse but also nonsparse surveillance regions. It can also achieve high-resolution imaging for sparse considered scenes efficiently using down-sampling raw data. Compared with a typical L₁ regularization imaging approach, which requires transfer of the two-dimensional (2-D) echo data into a vector and reconstruction of the scene via 2-D matrix operation, our proposed method has less computational cost and hence makes the large-scale regularization reconstruction of considered area become possible. The experimental results via real data validate the effectiveness of the proposed method.

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Hui Bi, Bingchen Zhang, XiaoXiang Zhu, and Wen Hong "Azimuth-range decouple-based L₁ regularization method for wide ScanSAR imaging via extended chirp scaling," Journal of Applied Remote Sensing 11(1), 015007 (24 January 2017). https://doi.org/10.1117/1.JRS.11.015007

Received: 31 July 2016; Accepted: 27 December 2016; Published: 24 January 2017

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