一种新的时频极大似然DOA估计方法  

DOA Estimation Based on Time-Frequency Maximum Likelihood

作　　者：田达[1] 张洪[1] 陈天麒[1] 

机构地区：[1]电子科技大学电子工程学院,成都610054

出　　处：《电子与信息学报》2005年第2期184-188,共5页Journal of Electronics & Information Technology

摘　　要：针对非平稳信号,提出一种新的时频域极大似然DOA估计方法,利用参考阵元与阵列中其它阵元输出之间的互伪Wigner-Ville分布建立起时频域的阵列信号模型,通过时频域极大似然方法获得入射方向估计。与基于空间时频分布矩阵的阵列测向方法相比,该方法具有计算量小、交叉项时频分布利用充分的优点。仿真实验证实了该方法的有效性。An algorithm is presented for Direction-Of-Arrival (DOA) estimation of nonstationary signals impinging on the antenna array. The proposed method establishes a simplified array signal model in the time-frequency (t-f) domain by evaluating the cross Pseudo Wigner-Ville Distributions (PWVD) between the outputs of the reference element and other elements of the array, and provides a signal selective DOA estimator based on the t-f maximum likelihood. Compared with the Spatial Time-Frequency Distributions (STFD) matrices-based methods, the proposed method can make full use of the crossterms in the t-f plane, and the computational load is significantly reduced. Simulations are provided to demonstrate the effectiveness of the method.

关 键 词：非平稳信号 时频极大似然 DOA估计值 WIGNER-VILLE分布 空间时频分布 

分 类 号：TN911.23[电子电信—通信与信息系统]