分布式电磁矢量传感器阵的二维测向算法

2-D DOA estimation using a sparse linear array of distributed electromagnetic vector sensors

采用由分布式电磁矢量传感器组成的稀疏线阵,针对相干信号提出了一种扩展孔径2维波达角(Two Dimensional Direction-of-Arrival,2-D DOA)估计算法.通过构造增强矩阵来消除信号的相干性,利用稀疏线阵包含的向量特性、x轴和y轴空间相位因子获得高精度无模糊估计.与传统算法相比,算法不但保留了传感器的向量特性,而且增大传感器各分量之间的间距以及传感器之间的间距来获得2-D孔径扩展,具有更高的测向精度.仿真验证了本文算法的有效性.

An extended-aperture based algorithm for two dimensional direction-of- arrival（2-D DOA）estimation of coherent sources using a sparse linear array of dis- tributed electromagnetic vector sensors （DEMVS） is proposed. First, the coherent signals are decorrelated by constructing an enhanced matrix. Then,the vector prop- erty,x-axis and y-axis spatial phase factors embedded in the sparse linear array are employed to extract the high accurate and unambiguous 2-D DOA estimations. Com- pared with traditional 2-D DOA algorithms in multipath environment, the proposed method keeps the vector property of the DEMVS,and also increases the spacing be- tween components of the EMVES and the inter-sensor spacing to achieve 2-D aper- ture extension, and thus providing better estimation performance. Simulations are presented to verify the efficiency of the proposed method.