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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。
GNSS receivers are increasingly being used in military applications, especially high-precision guided weapons. Aiming at the problem that the satellite signals are easily disturbed by the enemy ’s cheating signal, a method based on Doppler frequency estimation is proposed to resist the spoofing of the missile receiver. Firstly, the characteristics of Doppler variation of deceptive interference and real signal are analyzed. Then, residual signals are used to detect the satellite number of deceptive interference during the acquisition phase. Finally, an extended Kalman filter (EKF) is used in the tracking phase according to the high dynamic characteristics of the missile. Doppler frequency estimation, and based on the similarity of Doppler changes to extract fraudulent signals. Simulation results show that this method can effectively eliminate the interference of deceptive signals.