GPS定位系统自适应抗干扰算法研究  

A Research on Anti-jamming Algorithm of GPS Positioning System

作　　者：张怡[1] 薛喆[1] 齐小强[1] 

机构地区：[1]西北工业大学电子信息学院,陕西西安710129

出　　处：《计算机仿真》2011年第2期93-96,共4页Computer Simulation

基　　金：国家自然科学基金(60672184);航空科学基金(20085553016)资助

摘　　要：研究定位系统GPS抗干扰问题,针对定位信号传输过程受到干扰影响,无法完成导航功能。传统的CAB(Constrained Adaptive-Beamforming)算法在弱信号强干扰的条件下抑制干扰能力差,且对运动干扰的稳健性较差。为解决上述问题,提出利用正交加权约束对C-CAB算法进行修正,使在强干扰的情况下形成深零陷,提高输出信号的信干比,并引入干扰位置变化统计模型对算法进行改进,在GPS系统干扰快速移动的情况下依然有效,提高了算法的稳健性。仿真验证表明改进的算法能够在期望信号方向产生较高增益,在干扰方向形成了较深且宽的零陷,使寻航在移动环境下抗干扰能力明显,为定位系统优化提供了参考。Traditional CAB algorithm can not suppress the interference under the condition of weak signal with strong interference,and the stability under the movement interference is poor.In this paper,the orthogonal weighted constraints are used tomodify C-CAB algorithm so that to form deep nulls in case of strong interference to improve the SINR of the output signals.We introduce the statistical model of changes in interference position to improve the algorithm so that GPS system is still valid under the fast-moving disturbance circumstances.And we can improve the robutness of the algorithm.Simulation results show that higher gain toward the satellite direction can be obtained and form the deep and wide null.The proposed algorithm keeps the lower complexity and faster convergence.

关 键 词：全球定位系统 循环自适应波束形成 正交加权约束 零陷加宽 

分 类 号：TN911.7[电子电信—通信与信息系统]