摘要
利用四阶累积量估计相干信号的来波方向(DoA)需要获得修正阵列的方向矩阵。提出了一种估计修正阵列方向矩阵的改进算法,它减少了计算量,通过模式激励和空间平滑,实现均匀圆阵对来自不同独立信号源的相干信号的DoA估计,并利用虚拟阵列流形的中心对称性,将复矩阵的特征分解转换为实矩阵的特征分解,减少了计算量。相比基于自相关矩阵的算法,所提出方法提高了阵元利用率,有效地抑制了高斯噪声,不需要对模式激励后的数据进行白化处理,仿真结果表明,在低信噪比和多个独立信号源存在的条件下,有更明显的优势。
The direction matrix of modified array is needed to estimate the DoA for coherent signal based on the fourth-order cumulant. An improved algorithm for direction matrix estimation is presented, which reduces the computation burden, estimates the DoA for coherent signals from different independent sources using the mode excitation and spatial smoothing, and converts the eigen-decomposition of complex matrix into real matrix by utilizing the centro-symmetric shape of fictitious array manifold. Compared with the algorithm based on correlation matrix, the proposed method raises the array utilization ratio and suppresses the Gaussian noise. The simulation results show that when there are a lot of independent sources and the SNR is low, the algorithm has more obvious advantages.
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2006年第5期665-669,共5页
Systems Engineering and Electronics
关键词
相干信号
四阶累积量
阵列
算法
coherent signal
fourth-order cumulant
array
algorithm
