基于改进OMP的非正侧视MIMO-STAP 算法

An Non-side-looking MIMO-STAP Algorithm Based on Improved OMP

针对机载多输入多输出(MIMO)雷达空时自适应处理(STAP)技术在非正侧视条件下杂波抑制性能严重下降的问题,提出改进的正交匹配追踪算法(OMP)用于杂波谱的稀疏恢复。该算法首先确定非正侧视条件下的杂波脊线;然后在OMP算法的基础上增加了一条原子挑选依据,即原子对应点与杂波脊线的距离大小;不断挑选原子进入支撑集,直到残差小于门限值。仿真实验表明,使用OMP改进算法恢复出的杂波谱精度较高,得到的空时二维滤波器杂波抑制性能良好。

Aiming at the problem that the performance of airborne multi-input multi-output(MIMO)radar space-time adaptive processing(STAP)technology was seriously degraded under the condition of non-side-looking view,an improved OMP algorithm was proposed to recover the clutter spectrum.The algorithm firstly determined the clutter ridge line of non-side-looking view,then an atomic selection basis was added to OMP algorithm,that was,the distance between the corresponding point and the clutter ridge.Atoms were selected continuously into the support set until the residual was less than the threshold value.The simulation results showed that the improved OMP algorithm could recover the clutter spectrum with high accuracy and the obtained spatial-temporal filter had good clutter suppression performance.