基于复图像OMP分解的宽带雷达微动特征提取方法

摘要

针对宽带雷达中目标微动散射点发生越距离单元走动和方位欠采样条件下的微动特征提取问题，该文提出了一种基于复图像正交匹配追踪(OMP)分解的微动特征提取新方法。该方法利用目标“距离-慢时间像”的幅度和相位信息，构造复图像空间的微多普勒信号原子集，将向量空间的 OMP 算法拓展到复图像空间，实现了距离-慢时间平面上目标微动特征的提取。仿真实验表明该方法能够有效提取微动散射点发生越距离单元走动条件下的微动特征，并且可以实现方位欠采样时的微动特征提取。%　　In order to extract the micro-motion signatures in condition of Migration Through Range Cells (MTRC) of micro-motional scatterers and azimuthal undersampling in wideband radar, a method based on the Orthogonal Matching Pursuit (OMP) decomposition of the complex image is proposed. By making use of the amplitude and phase information of“range-slow-time image”, a set of micro-Doppler signal atoms is constructed in the complex image space. The OMP algorithm in vector space is then extend to the complex image space to obtain the micro-motion parameters. Simulations demonstrate the proposed method can extract the micro-motion signatures when MTRC of micro-motional scatterers is occurred, and can also work well when the sampling rate is lower than the Nyquist sampling rate.