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.
出处
《电子设计工程》
2012年第22期134-137,共4页
Electronic Design Engineering
