低信噪比下相干信号DOA估计算法研究  

Research on DOA estimation algorithm for coherent signal under low signal to noise ratio

作　　者：任全会 陈享成 Ren Quanhui;Chen Xiangcheng(Henan High Speed Railway Operation and Maintenance Engineering Research Center,Zhengzhou 451460,China)

机构地区：[1]河南省高速铁路运营维护工程研究中心,河南郑州451460

出　　处：《电子技术应用》2018年第11期53-56,共4页Application of Electronic Technique

摘　　要：为了解决低信噪比下相干信号波达方向(DOA)估计精度和分辨率不高的问题,提出了低信噪比下相干信号DOA估计算法,此方法主要利用了空间平滑算法和ES-MUSIC算法的优点。相干信号源进行解相干通过空间平滑技术实现,接着,再使用ES-MUSIC算法进行DOA估计。分别对DOA估计成功概率、DOA估计均方误差、DOA估计成功分辨概率进行了对比测试,测试结果表明,与传统的方法相比,该方法在低信噪比下DOA估计精度和分辨率更高。In order to solve the problem of low coherent signal DOA estimation accuracy and low resolution in low signal to noise ratio,this paper proposes a DOA estimation algorithm for coherent signal under low SNR.This method mainly uses the advantages of spatial smoothing algorithm and ES-MUSIC algorithm.Coherent signals are decohered through spatial smoothing,and then ES-MUSIC algorithm is used to estimate DOA.In this paper,the DOA estimation success probability,DOA estimation mean square error and DOA estimation successful resolution are compared.The test results show that compared with the traditional method,the proposed method has higher DOA estimation accuracy and resolution at low signal to noise ratio.

关 键 词：低信噪比 DOA估计 空间平滑算法 相干信号 

分 类 号：TP27[自动化与计算机技术—检测技术与自动化装置]