合成孔径雷达运动目标谱图二维压缩与重构方法  

Two dimensional SAR moving target spectrogram compressing and reconstructing method

作　　者：朱丰[1] 张群[1] 顾福飞[1] 孙凤莲[1] 李开明[1] 

机构地区：[1]空军工程大学电讯工程学院,陕西西安710077

出　　处：《电波科学学报》2012年第1期157-164,共8页Chinese Journal of Radio Science

基　　金：国家重点基础研究发展计划(973计划)项目(No.2010CB731905)

摘　　要：在完成合成孔径雷达(SAR)双通道回波数据对消处理的基础上,提出一种基于压缩感知的运动目标谱图二维压缩与重构方法。通过构造二维观测矩阵对SAR谱图在距离和慢时间方向上分别进行压缩,接收端设计二维正交匹配追踪法来重构原始谱图信息,进一步得到目标高分辨二维像。该方法可大幅降低SAR运动目标谱图数据量,并在稀疏度估计值不小于应有稀疏度值且两者比较接近的条件下,准确重构出原始谱图信息,同时得到高质量的运动目标二维像。仿真验证了方法的有效性。After cancellation processing of echoed data from two channels of SAR,a novel method based on compressed sensing is proposed,which implements two dimensional compressing and reconstructing for moving target spectrogram in SAR imaging.The two dimensional measurement matrixes are established to compress spectrogram data both in range and slow time.Then the two dimensional orthogonal matching pursuit（OMP） algorithm is designed in receiving port,which can reconstruct original spectrogram information to acquire the high resolution image of moving target.Firstly,the spectrogram data of SAR imaging for moving target can be reduced apparently by using the method;secondly,the primitive spectrogram information can be exactly reconstructed on the condition that the estimated sparsity degree is no less than and close to the supposed one,the high quality image of moving target can be achieved meanwhile.The effectiveness of the method is validated by the simulation results.

关 键 词：SAR成像 运动目标谱图 对消处理 压缩感知 二维压缩与重构 

分 类 号：TN957[电子电信—信号与信息处理]