基于矩阵重构的非等功率相干信号DOA估计  

ESTIMATION OF DOA FOR NON-EQUAL-POWER COHERENT SIGNALS BASED ON MATRIX RECONSTRUCTION

作　　者：董宛茹 马秀荣 单云龙 Dong Wanru;Ma Xiurong;Shan Yunlong(School of Electrical and Electronic Engineering,Tianjin University of Technology,Tianjin 300384,China;Engineering Research Center of Communication Devices and Technology,Ministry of Education,Tianjin 300384,China)

机构地区：[1]天津理工大学电气电子工程学院,天津300384 [2]光电器件与通信技术教育部工程研究中心,天津300384

出　　处：《计算机应用与软件》2023年第4期257-262,共6页Computer Applications and Software

基　　金：天津市高等学校自然科学研究重点项目(2018ZD10)。

摘　　要：针对功率相差较大和角度相隔较小的相干信号的波达方向(DOA)估计问题,提出一种基于Toeplitz矩阵重构的不变噪声子空间算法。对各个阵元的接收数据与参考阵元接收数据的相关函数进行排列,构造满秩的Toeplitz矩阵;引入虚拟信源优化Toeplitz矩阵,利用其不变噪声子空间特性估计信号波达方向。仿真结果表明该算法可以准确估计出功率相差40 dB、角度相邻2°的相干信号DOA,较空间平滑类算法具有更高的成功率与更强的分辨率。Aimed at the estimation of the direction of arrival(DOA)of coherent signals with large power differences and small angular separations,an invariant noise subspace algorithm based on Toeplitz matrix reconstruction is proposed.The correlation functions was arranged between the received data of each element and the received data of the reference element to construct a full-rank Toeplitz matrix.A virtual source was introduced to optimize the Toeplitz matrix,and its invariant noise subspace characteristics were used to estimate the DOA of the signal.The simulation results show that the algorithm can accurately estimate the DOA of coherent signals with a power difference of 40 dB and an angle of 2 degrees adjacent to each other.Compared with the spatial smoothing algorithm,it has a higher success rate and stronger resolution.

关 键 词：非等功率 相干信号 空间平滑 TOEPLITZ矩阵 噪声子空间 波达方向估计 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]