单快拍虚拟阵列Toeplitz矩阵重构的相干信源DOA估计

摘要

针对相干信源的DOA估计,提出一种基于单快拍虚拟阵列Toeplitz矩阵(SSVT)重构的解相干算法.该方法利用阵元接收的单快拍数据构造出双向虚拟子阵,并对虚拟子阵的协方差矩阵的平均值进行Toeplitz矩阵重构,实现对相干信源的DOA估计.该方法无需进行多次快拍,在不损失阵列孔径和工作阵元的基础上实现相干信源的DOA估计.仿真结果表明,该算法降低了运算量,在低信噪比的情况下也能分辨M-1个相干信源.%Aiming at the DOA estimation of the coherent signal source,a decoherent algorithm based on single snapshot vir-tual array Toeplitz(SSVT)matrix reconstruction is proposed. The method uses the single snapshot data received by the array ele-ment to construct the bidirectional virtual submatrix. The Toeplitz matrix reconstruction is performed for the mean value of the co-variance matrix of the virtual submatrix to estimate the DOA of the coherent signal source. It is unnecessary for the method to conduct the multiple snapshots,and can estimate the DOA of the coherent signal source on the basis of ensuring the array aper-ture and work array element. The simulation results show that the algorithm can reduce the computation,and distinguish the M-1 coherent signal sources in the case of low SNR.