一种基于稀疏表示的Off-grid DOA估计方法  

A Method for Off-grid DOA Estimation Based on Sparse Representation

作　　者：费晓超 Fei-Xiaochao(Nanjing Guorui Defense System Co.,Ltd,Nanjing 210019,China)

机构地区：[1]南京国睿防务系统有限公司,南京210019

出　　处：《信息化研究》2022年第2期18-22,共5页INFORMATIZATION RESEARCH

摘　　要：文章提出了一种基于改进信号模型的偏离网格(Off-grid)波达方向(DOA)估计方法,该模型基于稀疏空间协方差模型和泰勒展开下导向矢量的Off-grid表示。在此基础上,使用局部欠定系统解法(FOCUSS)解决稀疏恢复问题,并通过求解最小二乘(LS)问题以加快算法速度。仿真实验验证了本文算法具有优异的估计性能和较快的计算时间。A new method based on a modified model for Off-grid direction-of-arrival(DOA)estimation is proposed in this paper.The reformulated model is based on the sparse spatial covariance model and the Off-grid representation of the steering vector with Taylor expansion.According to this model,a new method alternating between a sparse recovery problem solved using the focal underdetermined system solver(FOCUSS)algorithm and a least squares(LS)problem to speed up the estimating process is presented.Numerical simulations demonstrate the superior performance of the proposed method.

关 键 词：波达方向估计 稀疏表示 Off-grid模型 

分 类 号：TN911[电子电信—通信与信息系统]