基于 Karhunen-Loeve 变换的 GPS 弱射频干扰检测

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 Satel-lite 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(To-eplitz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 de-tect radio frequency interference(RFI) in Global Positioning System(GPS) signal ,a novel RFI algo-rithm based on Karhunen-Loeve Transform(KLT) is proposed in this paper .GPS L1 signal is genera-ted 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 .