基于信号子空间处理的和/差波束干涉SAR/GMTI技术研究
doi: 10.3724/SP.J.1146.2005.00269
Research on SAR/GMTI Using-Beams Based on Signal Subspace Processing
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摘要: 该文研究了和/差波束干涉SAR/GMTI技术在通道不平衡条件下地杂波对消问题。文中阐述了和/差波束干涉SAR/GMTI的原理，推导了理想条件下地杂波空域对消因子。实际系统中，由于存在通道幅相不一致等误差，直接空域对消并不能有效抑制地杂波。该文研究了基于信号子空间处理的和/差波束干涉SAR/GMTI方案，通过二维信号子空间处理自适应地校正通道误差，进而对地杂波进行空域对消。仿真实验表明该方案对系统误差的敏感度显著下降，具有很好的鲁棒性，更适合于工程实施。Abstract: In this paper, a GMTI method for -beams is investigated, which is achieved by incorporating the along-track interferometric SAR/ GMTI technique with signal subspace processing. The principle of along-track interferometric SAR/ GMTI is analyzed, and the spatial cancellation matrix used to preprocess the image is derived. In practice, because of the channel errors (gain and phase error), a two-dimensional signal subspace processing method is used, which can blindly calibrate the sensors error and achieve the moving targets detection. The simulation results are presented to demonstrate the validity of this scheme.
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