一种基于加权平均的STFD矩阵的波达方向估计方法  

A Direction of Arrival Estimating Method Based on Weighted Averaging STFD Matrices

作　　者：郑观中[1] 廖桂生[1] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710071

出　　处：《雷达科学与技术》2005年第4期227-231,共5页Radar Science and Technology

基　　金：国家自然科学基金资助项目(No.60172028);高等学校博士学科点专项基金资助项目(No.20010701008)

摘　　要：提出了一种利用时频分布进行波达方向估计的改进算法。该算法以等距线阵为模型,在构建空间时频分布矩阵的基础上,选取多个能量峰脊上的时频点,对这些时频点进行加权平均,实现信源的波达方向估计。该方法采用加权平均,使高能量的时频点在阵列相关矩阵估计中起到更大的作用,更好地抑制了交叉项的影响,加强了TFD矩阵的对角化结构特性,从而提高了DOA估计的精度和性能。仿真结果验证了这种新方法的有效性。This paper presents an improved method of DOA estimation based on time-frequency distribution. The method chooses the uniform linear array as model, on the basis of designing the spatial time-frequency distribution matrix, selects time-frequency points on many energy ridges then weights and averages these points to estimate the DOA of the signal source. Weighted averaging used in this paper makes the high energy time-frequency points play more important role in matrix designing, and more efficiently suppresses the effect of the cross-terms and reinforces the diagonal performance, thus improves the precision and performance of DOA estimation. The simulations show the validity of the new method.

关 键 词：时频分布 波达方向估计 非平稳信号 

分 类 号：TN911.7[电子电信—通信与信息系统]