未知互耦条件下基于四阶累量的非均匀圆阵波达方向估计算法

基于互耦矩阵的特殊结构，给出了一种更具一般性的非均匀圆阵模型，提出了一种在未知互耦条件下的非均匀圆阵波达方向估计算法．由于采用了四阶累量，该算法可以估计出比阵元数更多信号的波达方向，并且对高斯噪声不敏感．由于未采用迭代算法，从而降低了算法运算复杂度．仿真实验证实了该算法的有效性．

DOA estimation for nonuniform circular array with mutual coupling based on fourth order cumulants

Based on the special structure of coupling matrix, a direction of arrival (DOA)estimation algorithm in the presence of unknown mutual coupling for the nonuniform circular array (NUCA) is presented. The geometry of the circular array was more general. Due to using the fourth order cumulants (FOC), the number of signals that can be coped with may be larger than the number of sensors in the array, and our algorithm is insensitive to Gaussian noise.Further, iteration is not required in our algorithm, which results in low computational complexity. Simulation results demonstrate the effectiveness of the proposed algorithm.