时空DOA矩阵方法

Space-Time DOA Matrix Method

本文提出了一种新的基于信号空时特征结构的高分辨二维DOA估计方法 时空DOA矩阵方法 .该方法在保持原DOA矩阵方法无需二维谱峰搜索和参数配对等优点的基础上 ,利用阵元输出之间的互相关关系将空域的阵列观测数据变换到时空域 ,通过空时二维处理在时空域中衍生出大量虚拟阵元 ,从而大大减弱了传统方法中对阵列结构、排布方式和阵元一致性的约束 ,不需要匹配子阵 ,无冗余阵元与孔径损失 ,并适用于阵元排列不规则的阵列 .仿真结果证明了该方法的有效性 .

Based on the space time eigenstructure of signals,a novel space time DOA matrix method is proposed to estimate the high resolution 2 D DOA of narrowband signals.The method transfers the observed data from space domain to 2 D space time domain by exploiting the cross correlation of the array outputs,and a large amount of virtual elements are generated through space time processing.Therefore the constraint over the array configuration and the element identity can be significantly weakened,which means the matching subarray is no longer needed and the advantage of the traditional DOA matrix method,such as automatical parameter alignment and no need of 2 D search,is still available.The simulation results show the effectiveness of the method.