基于Karhunen-Loeve变换的GPS弱射频干扰检测  

Weak radio frequency interference detection of GPS based on Karhunen-Loeve Transform

作　　者：陈鹏飞[1] 孙克文[1] 

机构地区：[1]合肥工业大学计算机与信息学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2016年第2期194-198,共5页Journal of Hefei University of Technology：Natural Science

摘　　要：干扰是无线电通信系统最大的威胁之一,干扰检测对于全球导航卫星系统(Global Navigation Satellite System,GNSS)信号非常重要。为了检测GPS(Global Positioning System)信号中射频干扰,文章提出了一种新型的基于Karhunen-Loeve变换(KLT)射频干扰(RFI)的检测算法。通过GPS信号模拟器生成GPS L1信号,并在射频前端叠加射频干扰;再利用KLT对其数字中频信号进行分析和处理,得到相关矩阵(Toeplitz矩阵)的特征值,通过特征值重建干扰信号。经过仿真验证,该算法能够成功地检测出干扰信号,包括微弱的干扰信号。Interference is one of the biggest threats to radio-communication system. Therefore, inter- ference detection is greatly important for Global Navigation Satellite System（GNSS）. In order to detect radio frequency interference（RFI） in Global Positioning System（GPS） signal, a novel RFI algorithm based on Karhunen-Loeve Transform（KLT） is proposed in this paper. GPS L1 signal is generated through GPS signal simulator and RFI is added to RF front-end. Then, by using KLT analysis and processing of their digital IF signal,the correlation matrix（Toeplitz matrix） eigenvalues are obtained, which can reconstruct interference signals. The simulation results show that the proposed algorithm can successfully detect the interference signal, even a weak signal.

关 键 词：干扰检测 全球导航卫星系统 KARHUNEN-LOEVE变换 特征值 

分 类 号：TN967.1[电子电信—信号与信息处理]