基于运动平台中心对称阵的相干信源DOA估计

DOA estimation of coherent signals based on the centrosymmetric array of moving platform

摘要:

当存在多径问题时，圆阵的空间谱测向性能会严重下降。对此，提出一种基于运动平台的中心对称阵平滑空间谱估计算法。该算法利用阵列在空间上的平移，得到多个平移后的协方差矩阵；同时利用中心对称阵的对称性，将接收数据反向处理，获得虚拟阵列数据的协方差矩阵。之后对所有协方差进行叠加，可获得一个新的满秩的协方差矩阵，实现解相干处理，完成信号的来波方向估计。仿真实验验证了该方法的有效性，并具备较大的工程应用价值。

Abstract:

When there is multipath propagation, the spatial spectrum direction-finding performance of circular arrays will be severely degraded. To address this, an algorithm based on the central symmetric array for smooth spatial spectrum estimation on a moving platform is proposed. This algorithm utilizes the spatial translation of the array to obtain multiple translated covariance matrices; at the same time, it leverages the symmetry of the central symmetric array to process the received data in reverse, obtaining the covariance matrix of the virtual array data. Subsequently, by stacking all covariance matrices, a new full-rank covariance matrix can be obtained, which achieves de-correlation processing and completes the estimation of the signal's direction of arrival. Simulation experiments have verified the effectiveness of this method and it has significant value for engineering applications.