摘要
目前GPS已经用于许多重要场合,而欺骗攻击可导致其无法正常运行。欺骗干扰对民用GNSS系统造成严重威胁,因此必须提出对欺骗信号进行检测和抑制的方法。首先介绍了一种使用空间滤波(调零)剔除无用信号的方法,并分析了该方法在欺骗条件下的性能;然后研究了对欺骗信号以及噪声信号的抑制,提出了一种采用梯度下降优化阵列权重矢量的方法,仿真表明该优化显著增大了欺骗信号的衰减,随着C/N0的增大,衰减接近-60 d B,而未优化时衰减值只有-30 d B,从而在DOA上限制了信号进入阵列。最后分析了调零技术对卫星真实信号可用性的影响,结果表明,如果卫星在信噪比降低12 d B的情况下还可用的话,则所有卫星都不会受影响。
Civilian GPS has found wide applications in civilian areas, while spoofing may lead to malfunctioning of it. Spoofing is a serious threat to civil GNSS system, and therefore it＇s necessary to study how to detect and reject the spoofing signals. Firstly, an anti-spoofing approach to reject undesired signals by using null-steering is presented. Detailed discussion is given to the method＇s procedure and performance. Then the suppression of spoofing signals and noise signal is studied, and a method to optimize the weight vectors is proposed. Simulation results show that the optimization significantly increases the attenuation of undesired signals. As C/No increases, the attenuation approaches -60 dB （which is only -30 dB without optimization）. Therefore, the spoofing signal is restrict to enter into the array. Finally, analysis is made to the impact of null-steering on visibility of GPS satellites. The results show that if the satellite is usable when the SN1R is reduced by 12 dB, then all the satellite will not be affected.
作者
李亚斌
郭承军
田忠
LI Ya-bin GUO Cheng-jun TIAN Zhong(Research Institute of Electronic Science and Technology, University of Electronic Science and Technology of China,Chengdu 610000, China)
出处
《电光与控制》
北大核心
2017年第1期37-40,95,共5页
Electronics Optics & Control
基金
四川省基础科研计划资助项目(2015JY0084)
国家教育部博士点基金(20120185120034)
