基于虚拟阵列空间平滑的相干信号DOA估计  

Virtual Array-Based Spatial Smoothing Method for Direction Finding of Coherent Signals

作　　者：张聪[1] 胡谋法[2] 卢焕章[2] 

机构地区：[1]西南电子电信技术研究所,四川成都610041 [2]国防科学技术大学电子科学与工程学院,湖南长沙410073

出　　处：《电子学报》2010年第4期929-933,共5页Acta Electronica Sinica

基　　金：国家863高技术研究发展计划(No.2007AA703428)

摘　　要：针对相干共轭循环平稳信号的DOA估计问题,提出了一种基于虚拟阵列前后向空间平滑的方法.该方法利用特定阵元输出间共轭循环相关函数的多时延采样,构造出与真实线阵阵元具有一一对应关系的虚拟阵列,并将空间平滑技术应用于该虚拟阵列实现了相干信号DOA估计.理论分析和仿真结果均表明,与FBSS-CCMUSIC算法和CCHAM算法相比,本文方法避免了最优时延选择问题,并获得了更高的DOA估计精度,同时,对信号不同入射方向也具有较好的稳健性.此外,该方法也可推广用于具有循环平稳特性的信号.This paper investigates the direction-of-arrival（DOA） estimation of coherent sources with conjugate cyclostationary properties.A virtual array-based forward backward spatial smoothing method is proposed.By properly applying multiple lag conjugate cyclic correlation functions of specified sensor outputs,a virtual array is constructed first.Based on which,the spatial smoothing technique is then introduced to estimate the DOAs of all the signals of interest.Theoretical analysis and experimental results demonstrate that,compared with the FBSS-based Conjugate Cyclic MUSIC and Conjugate Cyclic Hankel Approximation method,the proposed algorithm not only avoids the optimal lag choosing problem,but also achieves better performance in estimation accuracy.Besides,this method is robust against the difference in signal DOAs.In addition,the proposed method can also be applied to the signals with cyclostationary properties.

关 键 词：阵列信号处理 波达方向 循环平稳 相干 空间平滑 

分 类 号：TN911.7[电子电信—通信与信息系统]