基于四阶循环累积量的DOA估计方法

提出了一种新的波达方向估计算法,该算法构造了一个“谱相关DOA矩阵”,并基于此矩阵进行DOA估计。理论分析表明,通过谱相关矩阵的特征值分解,就可以得到源信号的DOA,该方法不需要进行谱峰搜索,同时利用循环平稳特性,可以有效抑制平稳噪声和滤除与信号循环频率不同的干扰信号,从而大大提高了算法的检测能力。另外还给出了相干信号DOA解决方法。

Direction of Arrival Estimation Using Fourth Order Cyclic Cumulation

In this paper,a new estimation algorithm is presented.The algorithm constructs a new matrix called(DOA-Matrix)to estimate the DOA.The theoretical analysis shows direction of arrival is estimated using the cyclic cumulative matrix.The algorithms are nulled out cyclic correlation of stationary additive noise and all other interferences with different cyclic frequencies.For coherent sources caused by multipath,we utlilze a special "forward/back averaging" method appropriate for uniform linear array .It is shown through simulations that the proposed method is able to handle more sources with fewer sensors and efficiently solves uncorrelated signals.