基于稀疏信号表示的SAR地面运动目标成像

SAR Ground Moving Target Imaging Based on Sparse Signal Representation

针对传统成像方法受瑞利分辨率的限制,提出了基于稀疏信号表示的地面运动目标成像方法。地面动目标回波可建模为稀疏线性调频信号,可将其在线性调频信号超完备基上稀疏表示。相对于距离-多普勒(RD)算法,基于稀疏信号表示的成像方法具有超分辨特性,有利于对运动目标检测。仿真与实测数据验证了该方法的有效性。

An approach of ground moving target imaging based on sparse signal representation is proposed to overcome the Rayleigh limitation in resolution.The echo from ground moving target can be modeled as sparse LFM signal,thus its decomposition with sparse signal representation is natural.Compared with the Range-Doppler method,the imaging method of the sparse signal representation has the feature of super-resolution,which is beneficial for moving target detection.The simulation and real data experiments show the validity of the approach.