Ground Moving Target Indication for HRWS-SAR Systems via Symmetric Reconstruction

Hongchao ZHENG  Junfeng WANG  Xingzhao LIU  Wentao LV  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E99-A   No.8   pp.1576-1583
Publication Date: 2016/08/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E99.A.1576
Type of Manuscript: PAPER
Category: Digital Signal Processing
multichannel synthetic aperture radar (SAR),  ground moving target indication (GMTI),  high-resolution wide-swath (HRWS),  symmetric reconstruction.,  

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In this paper, a new scheme is presented for ground moving target indication for multichannel high-resolution wide-swath (HRWS) SAR systems with modified reconstruction filters. The conventional steering vector is generalized for moving targets through taking into account the additional Doppler centroid shift caused by the across-track velocity. Two modified steering vectors with symmetric velocity information are utilized to produce two images for the same scene. Due to the unmatched steering vectors, the stationary backgrounds are defocused but they still hold the same intensities in both images but moving targets are blurred to different extents. The ambiguous components of the moving targets can also be suppressed due to the beamforming in the reconstruction procedure. Therefore, ground moving target indication can be carried out via intensity comparison between the two images. The effectiveness of the proposed method is verified by both simulated and real airborne SAR data.