基于时钟频漂检验的卫星导航欺骗识别算法

GNSS spoofing detection algorithm based on clock frequency drift monitoring

通过分析欺骗信号对目标接收机时钟频漂的影响,建立被欺骗目标接收机在匀速圆周运动条件下的时钟频漂模型,将其与单位余弦函数进行圆相关,通过检测归一化相关值可以成功实现对欺骗干扰信号的检测,同时有效避免了虚警的发生;通过对相关相位及相关峰值分析处理可以解算出欺骗信号的方位角及仰角,仿真表明对方位角和仰角的估计误差在1°以内。该算法可行性较强,具有重要的理论价值和应用价值。

Through the analysis of the influence of deception signals on the target receiver clock frequency drift,a receiver clock frequency drift model is established in uniform circular motion when the target receiver is cheated.Then the correlation values between clock frequency drift and cosine function are calculated.By moni-toring the normalized circle correlation values we can successfully detect deception jamming signals,and effec-tively prevent the occurrence of a false alarm at the same time.Through analyzing related peak phase and relat-ed processing calculated we can get the azimuth and elevation angles of disturbing source.Simulation results show that the azimuth and elevation angle estimation error is within 1＆#176;.This algorithm is very feasible,and has very important theoretical and practical values.