利用延时预处理的DOA估计方法  

A method of DOA estimation based on delay preprocessing

作　　者：司伟建[1] 林晴晴[1] 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2012年第7期894-898,共5页Journal of Harbin Engineering University

基　　金：黑龙江省教育厅科学技术研究资助项目(11544025);中央高校基本科研业务费专项资金资助项目(HEUCF120802)

摘　　要：针对MUSIC算法的分辨力和测角精度受到信噪比、快拍数等因素限制的问题,提出了利用延时预处理的波达方向(DOA)估计算法,该算法充分利用蕴含在接收数据延时相关函数中的信号角度信息.利用所有阵元接收数据的延时相关函数构造新的阵列输出矩阵进而得到新的协方差矩阵,对其进行特征值分解,得到噪声子空间,最后引入变尺度混沌优化算法来简化空间谱估计函数的构造和谱峰搜索过程.仿真实验表明,该算法分辨率和测角精度均优于MUSIC算法并且减小了计算时间.The resolution and angular precision of the MUSIC algorithm are limited by factors such as its signal-tonoise ratio （SNR） and the number of snapshots. To solve this problem, a direction of arrival （DOA） estimation algorithm based on delay preprocessing was proposed which used the DOA information contained in the delay correlation function of the received data. This algorithm used the delay correlation function of all the received data to construct a new array matrix. Next, a new covariance matrix was received by the new array matrix, then eigenvalue decomposition was applied, and the noise subspace was received. In order to simplify the spectrum function and peak searching of the spectrum function, the mutative scale chaos optimization algorithm was used. Simulation results show that the angular precision and resolution performance of the proposed algorithm are better than those from the MUSIC algorithm, and the computing time is reduced.

关 键 词：阵列信号处理 波达方向估计 分辨率 延时相关函数 

分 类 号：TN911[电子电信—通信与信息系统]