空间非平稳高斯噪声背景下混合信号的DOA估计

针对空间非平稳高斯噪声背景下混合信号的DOA估计问题,提出了基于四阶累积量对混合波源的DOA估计算法。该算法首先构造四阶累积量矩阵,利用类似ESPR IT方法估计出所有非相关信源的DOA,然后对四阶累积量进行修正空间差分平滑去相干,消除非相关源和空间非平稳高斯噪声的影响,从而实现了对相干源的DOA估计。此方法通过分别估计非相关和相关或者相干信号的DOA,能够以较少的阵元实现对多个信号DOA估计,最后仿真实验也验证该算法的有效性。

DOA Estimation Method for Mixed Signals under Spatially Nonstationary Gauss Noise Fields

In this paper,a new direction of arrival(DOA)estimation method based the fourth-order cumulates(FOC)is proposed for mixed signals under spatially nonstaionary gauss noise field.This method comprises two steps: the first step is to estimate the uncorrelation signals by using similarly ESPRIT method by reconstructing FOC matrix of mixed signals,the second step is to resolve the coherent signals with the modified spatial difference smoothing matrix,and then the uncorrelation signals and spatial nonstaionary gauss noise can be eliminated.The number of sources resolved by the proposed method can exceed the number of array elements.Simulation result indicates the proposed method is effective.