摘要
短波经电离层反射后产生的多径具有不同的极化状态。为充分利用多径信号间的极化差异改善短波通信质量,提出一种基于极化敏感阵列的短波多径合成方法。首先用改进的极化空间多重信号分类(Multiple Signal Classification,MUSIC)算法实现每条径到达角、极化参数估计,采用估计的参数设计滤波器分离出每一条信号单径,将各条径的时频参数补偿对齐,对分离出的多条径按最大输出信噪比进行接收波形合成。理论分析和仿真实验表明,所提方法分离出的单径相比极化空间最小方差无失真响应(Minimum Variance Distortionless Response,MVDR)方法具有信噪比上的提升,并且能够通过多径间的合成在单径的基础上获得信噪比的增益,改善信号质量。
High frequency multipath signals generated from the ionosphere have different polarization states.To take advantage of the polarization difference between multipath signals to improve HF communication,a multipath combination method based on polarization sensitive array is proposed.An improved polarization MUSIC is used to estimate DOA(direction of arrival)and polarization of each path first,and the estimated parameters are then used to design a filter to separate each singlepath signal.After the time delay and frequency shift of each path are compensated,the separated paths are combined according to the maximum output SNR criterion.Analysis and simulation experiments show that the proposed method has an improvement in SNR of single-path signal compared to the Capon beamformer,and could obtain the SNR gain from the multipath combination,thus improving the signal quality.
作者
杨松桥
辛吉荣
唐文岐
陆路希
YANG Songqiao;XIN Jirong;TANG Wenqi;LU Luxi(Information Engineering University,Zhengzhou 450001,China;National Key Laboratory of Science and Technology on Blind Signal Processing,Chengdu 610041,China)
出处
《信息工程大学学报》
2022年第3期271-276,共6页
Journal of Information Engineering University
关键词
极化敏感阵列
到达角和极化参数估计
波束形成
信号合成
多径信道
polarization sensitive array
DOA and polarization estimation
beamforming
signal combination
multipath channel
