基于单次快拍的双基地MIMO雷达多目标角度估计方法

摘要

该文提出了一种双基地MIMO雷达体制下，利用单次快拍的回波数据进行多目标2维发射角(DOD)和2维接收角(DOA)联合估计的新方法。首先对等效接收阵数据的自相关矩阵进行发射分集平滑实现接收角(DOA)的估计，然后对等效发射阵数据的自相关矩阵进行接收分集平滑实现发射角(DOD)的估计，最后通过最大似然法完成两种角度的配对。该算法仅用一个时域快拍的数据实现了多目标回波的解相干，对发射和接收阵型有着广泛的适应性，同时为高速机动目标的角度测量提供了一种新的思路，仿真实验表明了该算法的有效性。%This paper presents an angle estimation method for multitargets in bistatic MIMO radar system. It can estimate DOD and DOA with single snapshot in time domain. By exploiting transmisson diversity smoothing to the equivalent receiving array data, the rank of the auto-covariance matrix of the multitargets’ scatters is recovered, which make DOA estimation go well. Similarly, receiving diversity smoothing to the equivalent transmitting array data is implemented to facilitate the DOD estimation. A matching method for the two kinds of angle based on the maximum likelihood principle is employed. In this way, only one snapshot of echo data decorrelates the coherence among the multitargets’ scatters successfully. In addition, the method is not limited to any certain array shape. Numerical results are presented to demonstrate the effectiveness of the method.