基于COLD阵列的联合稀疏重构信号DOA估计方法

摘要

A joint sparse reconstruction method is proposed for the estimation of the direction-of-arrival (DOA)of narrowband or wideband signals by using a co-centered orthogonal loop and dipole(COLD) vector antenna array.This method is based on the sparse representation of the first column vector of the polarization-space covariance matrix constructed by the output of the COLD array,which can be regarded as two perpendicular loops and dipole separated antenna arrays.The DOA estimates are then obtained via the convex optimation(l1-norm based)joint sparse reconstruction technique under the l2-norm con-straint.Simulation results show the superior performance of the presented method over the traditional methods in terms of resolution and DOA estimation accuracy.%针对窄带和宽带两种情形,提出了一种基于同点正交磁环偶极子矢量天线(Co-centered or-thogonal loop and dipole,COLD)阵列的联合稀疏重构信号波达方向(Direction-of-arrival,DOA)估计方法.该方法首先构造极化-空间域协方差矩阵,并对其第一列进行稀疏表示,在此基础上利用COLD阵列可视为相互垂直的磁环阵列和偶极子阵列这一特点,采用 l2-范数约束下的凸优化(l1-范数)联合稀疏重构技术实现信号DOA估计.仿真实验表明,该方法较之现有方法具有分辨力高、估计精度高等优点.