基于压缩感知的非均匀空间立体阵SAR层析三维成像新方法的研究

项目名称： 基于压缩感知的非均匀空间立体阵SAR层析三维成像新方法的研究

项目编号： No.61271343

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 无线电电子学、电信技术

项目作者： 刘梅

作者单位： 哈尔滨工业大学

项目金额： 70万元

中文摘要： 分布式星载SAR是近年来欧美等国竞相发展的热点，为满足在同一系统上完成高程反演、动目标跟踪、高分辨成像等多种任务，非均匀空间立体构形成为必然趋势。发展非均匀空间立体阵SAR对我国提高综合减灾能力和实现国防现代化建设具有重要的战略意义。在这种需求背景下，本项目展开非均匀空间立体阵SAR三维成像、杂波抑制与动目标成像等方法研究。针对非均匀空间立体阵SAR层析三维成像中数据非均匀欠采样，非均匀杂波抑制效果差、动目标成像匹配误差大等实际问题，根据非均匀立体阵SAR基线稀疏分布的特点和各路回波信号的相干性提出了基于压缩感知的非均匀空间立体阵SAR层析三维成像方法。建立了稀疏信号与阵列信号联合处理的新理论，以推动我国数字高程模型产品、多路径立体产品、变化检测产品的生产与完善。

中文关键词： 非均匀空间立体阵SAR；压缩感知；三维成像；动目标参数估计；杂波抑制

英文摘要： Spaceborne distributed synthetic aperture radar (DSAR) is a hot topic and competively developed by Europe and America. For the sake of multi-task including elevation retrieval, moving target tracking, high resolution imaging, etc., non-uniform three dimenssional (NU3D) configuration of DSAR must be an inevitable trend. The development of NU3D-DSAR has strategic significance for improving compreensive ability of domestic disaster mitigation and modernization of national defence. Back on this requirement background, in this project we will do research on the method of 3D-imaging, clutter suppression and moving target imaging, etc. on NU3D-DSAR. The tomographic SAR (TomoSAR) 3D imaging method based on compressive sensing (CS) is presented, according to the sparsely distributed of baselines and the coherence of echos, to overcome the non-uniform and undersampling of the received data in TomoSAR, the performance degrade of suppressing inhomogeneous clutter, the big match error of imaging moving targets, etc. A novle theory which combines sparse and array signal processing is biult, to promote the manufacture and improvement of our country's digital elevation measurement (DEM) product, multi-path stereo product,and change detection product.

英文关键词： Non-uniform space configuration SAR；Compressed sensing；3-D imaging；Moving target parameter estimation；Cutter suppression