利用Radon-Wigner变换提高LFM信号的时频DOA估计性能  

Improvement of DOA estimation performance for LFM signals using Radon-Wigner transform

作　　者：胡航[1] 

机构地区：[1]哈尔滨工业大学电子与信息技术研究院,哈尔滨150001

出　　处：《哈尔滨工业大学学报》2009年第7期26-29,共4页Journal of Harbin Institute of Technology

摘　　要：本文采用Radon-Wigner变换作为时频工具,在多目标环境下有效地抑制交叉干扰项和噪声,具有很好的时频汇聚性.模拟结果表明,在多LFM信号情况下,与基于PWVD和SPWVD的方法相比,基于Ra-don-Wigner变换的方法的DOA估计精度有显著提高;且其方向估计性能基本不随SNR的下降而恶化,这对于在低SNR环境下进行DOA估计十分有利.Radon-Wigner transform （RWT） was employed as time-frequency tool to eliminate cross interference terms and noise in the background of multiple sources effectively with excellent time-frequency concentration performance. Simulation results demonstrate that in the situation of multiple LFM signals, the DOA estimation accuracy based on RWT is notably improved compared with that based on pseudo Wigner-Ville distribution （PWVD） and smoothing PWVD （SPWVD）, and the direction estimation performance is basically not deteriorated with the decrease of SNRs, which is beneficial to the DOA estimation in low SNR environment.

关 键 词：Radon—Wigner变换 DOA估计 时频分析 交叉项抑制 

分 类 号：TN911.7[电子电信—通信与信息系统]