基于对称阵列Wigner-Ville分布的宽带线性调频信号AOA估计  

Angle-of-Arrival Estimation of Wideband Chirp Signals Using The Wigner Ditribution of Symmetrical Sensor Array

作　　者：黄克骥[1] 田达[1] 陈天麒[1] 

机构地区：[1]电子科技大学电子工程系,成都610054

出　　处：《信号处理》2003年第2期104-107,共4页Journal of Signal Processing

摘　　要：本文提出了基于对称阵元Wigner-Ville分布(WVD)的宽带线性调频信号到达角(AOA)估计算法。该算法利用对称阵元输出延时参数的互补性和Wigner分布定义提取宽带信号方向向量,建立了新的空间时频矩阵。借助线性调频信号Wigner分布的良好时频聚集特性,适当选取时频点实现了对各个信号AOA的逐一估计。在新的空间时频矩阵模型基础上给出了基于信号子空间投影的AOA估计方法。它不需要对AOA的初始估计、聚汇和插值,减少了计算量,提高了精度,仿真实验证明了算法的有效性。Recently, the time-frequency techniques have been successfully applied in narrowband direction-of-arrival AOA estimation[1]-[4]. A novel time-frequency approach to direction finding of wideband chirp signals is proposed. Our technique employs the Wigner-Ville distribution(WVD) of symmetrical sensor array to get direction vectors of wideband chirp signals. By time-frequency selectivity, a new data model is constructed to estimate AOA of each signal one by one. A subspace method is exploited to deduce AOA from the new model. The computation cost of our method is low because no focussing or interpolation is needed. Simulation results illustrate the performance of our method.

关 键 词：阵列信号处理 宽带线性调频信号 达角估计算法 对称阵列Wigner-Ville分布 

分 类 号：TN911.7[电子电信—通信与信息系统]