基于累积量的互耦误差下相干信号DOA估计

Direction of arrival estimation of coherent signals based on cumulants in the presence of mutual coupling

在高斯色噪声和阵列互耦误差背景下,针对相干信号源和非相干信号源并存的问题,提出了一种准确估计信号源到达角(DOA)的算法。首先,采用辅助阵元法将互耦误差从阵列流形中分离;然后结合空间平滑技术和四阶累积量构建平滑矩阵,实现对高斯噪声的抑制和对信号的解相干;最后使用ESPRIT算法获得信号源的来波方向。仿真结果表明,文中算法有效解决了阵列互耦和信源相干的影响,在高斯白噪声和高斯色噪声环境下均能精确地估计DOA。

In this paper, a novel direction of arrival （DOA） estimation approach is proposed for coherent and uncorrelated signals against array mutual coupling in colored Gaussian noise situation. Firstly, matrix. auxiliary Then the sensors are adapted to separate the mutual coupling coefficients from the array manifold spatial smoothing technique and fourth-order cumulants are combined to suppress the Gaussian noise and simultaneously solves the coherency between signals. Finally, in the estimation process of DOAs, the ESPRIT method is adopted. The simulation results demonstrate that the proposed algorithm can effectively solve the problem of signal coherency in the presence of array mutual coupling and accurately estimate the DOAs in either white or colored Gaussian noise situation.