强干扰与通道误差条件下弱信号DOA估计的实验研究  

Experimental validation of spatial spectrum suppression algorithms for interference sources

作　　者：孙家宝 施伟 王身云[1] Sun Jiabao;Shi Wei;Wang Shenyun(School of Electronics and Information Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China;The Sixty-third Research Institute,National University of Defense Technology,Nanjing 210007,China)

机构地区：[1]南京信息工程大学电子与信息工程学院,江苏南京210044 [2]国防科技大学第六十三研究所,江苏南京210007

出　　处：《电子技术应用》2024年第6期101-106,共6页Application of Electronic Technique

摘　　要：在实际测向系统中,当弱信号和强干扰空间临近时,空间谱测向系统仅能对强干扰进行波达方向(Direction of Arrival,DOA)估计,弱信号DOA估计性能下降甚至失效。针对这一问题,研究了空间谱扩展噪声子空间算法结合通道幅相误差校正,在强干扰抑制条件下对弱信号进行DOA估计的方法。该方法对采样信号的噪声协方差进行去加权处理,并对空间谱扩展噪声子空间算法的空间谱导向矢量进行修正。基于通用软件无线电外设(Universal SoftwareRadioPeripheral,USRP)和印刷偶极子线形天线阵构建实验平台,实验结果证明空间谱扩展噪声子空间算法结合改进的通道幅相误差校正方法,能对临近干扰源进行空间谱抑制的同时,实现对弱信号的DOA估计。In the actual direction finding system,when the weak signal and the strong interference are spatially close,the spatial spectrum direction finding system can only estimate the direction of arrival(DOA)for the strong interference,and the performance of DOA estimation for the weak signal is degraded or even invalid.To address this problem,the spatial spectrum extended noise subspace algorithm combined with channel amplitude-phase error correction is investigated for DOA estimation of weak signals under strong interference suppression conditions.The method de-weights the noise covariance of the sampled signal and corrects the spatial spectrum guidance vector of the spatial spectral expansion noise subspace algorithm.The experimental platform is constructed based on Universal Software Radio Peripheral(USRP)and printed dipole linear antenna array,and the experimental results demonstrate that the spatial spectrum extended noise subspace algorithm combined with the improved channel amplitude-phase error correction method can realize DOA estimation of weak signals while spatial spectrum suppression of neighboring interference sources.

关 键 词：通道幅相误差 校正 扩展噪声子空间 通用软件无线电外设(USRP) 空间谱测向 

分 类 号：TN97[电子电信—信号与信息处理]