针对多输入多输出(MIMO)雷达在色噪声背景下对相干信源的超分辨测向问题,提出了一种改进的空间差分平滑(ISDS)算法,并且在ISDS算法的基础上,又提出了一种基于传播算子的快速算法,即PM-ISDS 算法。理论分析及仿真实验均表明所提的基于传播算子的PM-ISDS算法具有很强的色噪声抑制能力,估计性能优于常规的空间平滑算法,分两步处理的方法可以重复利用雷达的接收数据,具有较好的阵元节省和信源过载能力,并且在求解过程中不必进行特征值分解,运算量较小。

An improved spatial difference smoothing ( ISDS) algorithm is proposed, to solve the coherent sources super direction resolution of multiple input multiple output ( MIMO) radar in colored noise environment. And on the basis of the ISDS algorithm, a fast algorithm named PM-ISDS based on propagation operator is proposed to reduce the calculated quantity. Theoretical analysis and simulation show that the proposed algorithm could suppress colored noise efficiently and has better performance in parameter estimation than conventional spatial smoothing algorithm. The two-step processing could reduce the demand of array elements and improve the overload capacity by reutilizing the receive data, and the processing procedure does not need to do eigenvalue decomposition which could significantly reduce the calculated quantity.

TN957.52

国家自然科学基金资助项目( No61601502;No61501501);航空基金资助项目(20150196007;20150196003; 20160196003)