基于LCMV准则的空时极化联合抗干扰算法  

Joint Anti-jamming Algorithm for Space-time Polarization Based on LCMV Criterion

作　　者：金鸣 吕婷婷[2] 周曼丽 李昊阳 曹源[2] JIN Ming;LYU Tingting;ZHOU Manli;LI Haoyang;CAO Yuan(Research Institute of System Engineering,Chinese Academy of Military Sciences,Beijing 100091,China;Faculty of Information Science and Engineering,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国人民解放军军事科学院系统工程研究院,北京100091 [2]中国海洋大学信息科学与工程学部,山东青岛266100

出　　处：《无线电工程》2022年第8期1434-1440,共7页Radio Engineering

基　　金：国家自然科学基金(91938204,41527901,61701462)。

摘　　要：随着卫星导航技术的发展及干扰的复杂化,传统的空时滤波方法已经难以满足需要,在空时滤波过程中,如果卫星导航信号和干扰信号的来波信号相同,天线增益不仅会在干扰来向上形成零陷,同时也会极大程度地衰减卫星信号。通过多域联合的自适应滤波算法来抑制干扰已经成为必然趋势,因此,在空时滤波的基础上引入了极化域信息,实现空、时、极化三维域的联合抗干扰。在传统的线性约束最小方差(Linear Constrained Minimum Variance,LCMV)算法的基础上,增加了信号的极化域信息,有效地解决了在期望卫星信号和干扰信号来向相同时卫星信号受影响的问题。分析结果表明,当期望和干扰信号来波方向相同时,空时极化自适应抗干扰算法可以从极化域的维度上将期望和干扰信号分离开,从极化域上形成零陷,滤除干扰信号,保留期望信号的天线增益,具有十分实用的理论意义。With the development of satellite navigation technology and the complexity of interference,traditional space-time filtering method is difficult to satisfy relevant demands.In the process of space-time filtering,if satellite navigation signal and the arrival wave of interference signal are the same,the antenna gain will not only form a null in the interference direction,but also drastically attenuate the satellite signal.It has become an inevitable trend to suppress interference through multi-domain joint adaptive filtering algorithm.Therefore,polarization domain information is introduced on the basis of space-time filtering to realize three-dimensional domain joint anti-interference of space,time and polarization.Based on the traditional Linear Constrained Minimum Variance(LCMV)algorithm,the polarization domain information of the signal is added,which effectively solves the problem of satellite signals being affected when the expected satellite signal and interference signal are arriving in the same direction.Analysis results show that when the directions of the expected and interference signals are the same,the algorithm can separate the expected and interference signals from the dimension of polarization domain,forming a null in the polarization domain,filtering out the interference signal while retaining the antenna gain of the desired signal.The proposed algorithm is of practical theoretical significance.

关 键 词：极化敏感阵列 信号极化特性 空时滤波 空时极化自适应抗干扰 多域联合 

分 类 号：TN911.72[电子电信—通信与信息系统]