一种非平稳信号的DOA估计方法  

A kind of DOA estimation method for nonstationary signals

作　　者：邓凯 周柱[2] 刘国宝 李国良 

机构地区：[1]空军驻京津地区军事代表室,天津300308 [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：《电子设计工程》2012年第22期134-137,共4页Electronic Design Engineering

摘　　要：利用空时频分布(STFD)矩阵估计非平稳信号DOA的关键是选择合适的时频点。用白化后的接收信号矢量构造STFD矩阵,利用该矩阵迹构造判决量来选择时频图的自项,将选择的自项的STFD矩阵平均,然后运用MUSIC算法来估计DOA。仿真证明:本文的方法可以很清晰的选出非平稳信号的自项,运用该自项点的平均STFD矩阵估计的信号DOA更准确。For non-stationary signal direction of arrival （DOA） estimation using the Spatial-Time-Frequency Distribution （STFD） matrix, the key issue is to select appropriate time-fi＇equency points. By whitening the received signal vector, the corresponding STFD whitening matrix can be formed, and the auto-item can be distinguished according to the nmtrix trace as the decision variable. Average all the STFD matrices of the auto-terms, the 1）OA of the signals can be estimated using MUSIC method. Simulations show that the auto-term of non-stationary signal can be selected clearly using the proposed method and the DOA can be accurately estimated by the averaged STFD matrices corresponding to the selected auto-terms.

关 键 词：非平稳信号 波达方向 空时频分布矩阵 白化矩阵 迹 

分 类 号：TN911.72[电子电信—通信与信息系统]