基于Doppler估计的弹载接收机抗欺骗干扰研究

GNSS接收机在军用方面尤其是高精度制导武器中的应用日益增强.针对卫星信号易受敌方欺骗信号干扰的问题,设计一种基于Doppler频率估计的弹载接收机抗欺骗干扰的方法.首先分析了欺骗干扰和真实信号的Doppler变化特点;然后在捕获阶段利用残留信号检测存在欺骗干扰的卫星编号;最后根据弹载的高动态特性,在跟踪阶段采取扩展 Kalman 滤波器(EKF)进行载波Doppler频率估计,并根据Doppler变化的相似性提取出欺骗信号.通过仿真实验验证,该方法可以有效排除欺骗信号的干扰.

Research on Anti-spoofing of Missile Borne Receiver Based on Doppler Estimate

The use of the GNSS receivers in the military is increasingly strengthened.Aiming at the problem that the GNSS signal is vulnerable to jamming of the enemy's spoofing,a method based on Doppler estimate is designed.The characteristics of Doppler's changes of spoofing jamming and real signal are analyzed.The satellite numbers to be spoofed are detected through the residual information in signal acquisition phase.According to the high dynamic characteristic of the missile,the EKF is used to estimate the carrier Doppler frequency,and the spoofing signal is extracted depending on the similarity of Doppler's change.The simulation results show that this method can effectively eliminate the interference of the deceptive signals.