对GNSS功率倒置自适应调零算法中步长取值的优化  

Optimization of Step Size in GNSS Power Inversion Adaptive Nulling Algorithm

作　　者：史永清 李传军[1] 杨尧 SHI Yongqing;LI Chuanjun;YANG Yao(School of Aerospace Engineering,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学宇航学院,北京100081

出　　处：《电子信息对抗技术》2022年第6期8-12,59,共6页Electronic Information Warfare Technology

摘　　要：基于功率倒置的自适应调零技术能够很好地抑制干扰信号,是目前最为常用的全球卫星导航系统(Global Navigation Satellite System,GNSS)抗干扰技术,研究其求解算法具有重要意义。首先介绍了自适应天线阵列、功率倒置(Power Inversion,PI)算法的原理、归一化最小均方(Normalized Least Mean Square,NLMS)算法和自适应滤波器结构。提出并详细推导了基于相对误差的变步长归一化最小均方算法,研究了参数对步长变化的影响。在不同干扰功率、干扰方向突变和干扰功率突变的条件下与已有的变步长算法进行对比,提出的算法收敛速度更快,稳态误差更小,在计算量上也更具优势。The adaptive nulling technology is used to suppress interference signal very well.It is the most commonly used anti-jamming technology of global navigation satellite system(GNSS).Its solution algorithm needs to be studied in depth.Firstly,the adaptive antenna array,the principle of power inversion(PI)algorithm,the normalized least mean square(NLMS)algorithm and adaptive filter structure are introduced.Secondly,the variable step size normalized least mean square algorithm based on relative error is proposed and deduced in detail.The influence of parameters on step-size is studied.Finally,the proposed algorithm is compared with the existing variable step-size algorithms,under the conditions of different interference power,sudden change of interference direction and sudden change of interference power.The proposed algorithm has faster convergence speed and smaller steady-state error.And it needs less calculation.

关 键 词：GNSS 自适应调零 功率倒置 相对误差 归一化变步长 

分 类 号：TN967.1[电子电信—信号与信息处理]