一种基于空间时频分布的波达方向估计方法  

A Method of Direction-of-Arrival Via Spatial Time-frequency Distribution

作　　者：袁泉[1] 石昭祥[1] 

机构地区：[1]解放军电子工程学院,安徽合肥230037

出　　处：《探测与控制学报》2007年第2期50-53,57,共5页Journal of Detection & Control

摘　　要：基于信号空间时频分布的到达角(D O A)估计算法利用Cohen类分布构造时频分布矩阵代替传统的阵列协方差矩阵,既适用于平稳信号的场合又适用于时变、非平稳信号的情形。如何在时频分布矩阵中选择合适的时频点是此类算法的关键。分析了信号项选择和联合对角化的原理,并通过无约束最优化方法在时频平面上寻找单信号项的时频点,通过时频MUSIC方法对线性调频信号进行D O A估计,仿真结果证实了该方法的有效性。Based on the spatial time-frequency distribution of signals, direction of arrival method uses the Cohen class time-frequency distribution to construct the time-frequency correlation matrix D xx （ t, f ） to replace the traditional correlation matrix R xx. The method is suitable for both stationary and time-variation nonstationary signals, how to select appropriate time-frequency locations is the key point of this kind of DOA methods. The paper analyses the principle of auto terms selection and joint-diagonalization. An unconstrained optimization method is used to find the time-frequency location of single auto terms（SAT）, time-frequency MUSIC is used to estimate DOA of chirp signal. The simulation results show the effectiveness of the method.

关 键 词：空间时频分布 波达方向 最优化方法 非平稳信号 

分 类 号：TN911.7[电子电信—通信与信息系统]