一种新的卫星导航跟踪段欺骗攻击检测方法

A Novel Spoofing Attack Detection Method in Satellite Navigation Tracking Phase

针对中、低动态环境下,卫星导航系统跟踪段存在的欺骗式干扰信号的检测问题,提出一种基于载波相位跟踪谱分析的欺骗检测方法。该方法利用跟踪环路鉴相器输出信号的频谱特性与环路中是否存在干扰信号密切相关,通过对鉴相器输出信号进行谱分析,建立欺骗检测模型,实现了欺骗信号检测。仿真结果表明,利用该方法,在干信比大于4 d B时,通过设置合适的判决门限,采用256点以上快速傅里叶变换,在虚警率不超过0.5%的情况下,能获得100%的检测概率,对跟踪段的欺骗信号具有很好的检测效果。

In order to detect the spoofing signal in the tracking phase of a satellite navigation system under middle or low dynamic environment,a novel spoofing detection method based on the spectrum analysis of the carrier phase tracking is proposed. The spectral characteristics of the phase discriminator output signal are closely related to the spoofing signal in the tracking loop. A model to detect spoofing signal is produced by using spectrum analysis of the phase discriminator output signal. The simulation results show that,when jamming-signal-ratio is more than 4d B,by setting an appropriate threshold and adopting FFT with more than 256 points,100% detection probability is achieved by using this method,while the false alarm probability does not exceed 0. 5%. A good detection effect on the spoofing signal in the tracking phase can be obtained by this method.