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GNSS信号在载体高动态飞行时会产生较大的多普勒频移,常规的跟踪环难以稳定跟踪信号,可能会使信号失锁。本文提出了一种利用惯性信息为跟踪环路提供辅助多普勒频移的方法,从而解决高动态环境下GNSS信号的稳定跟踪问题。实验结果表明:在载体以50g的加速度相对卫星运动时,该方法显著降低了高动态对跟踪环路的影响,使接收机动态跟踪性能明显提升。
GNSS signal in the carrier high dynamic flight will have a larger Doppler shift, the conventional tracking loop is difficult to track the signal stability, the signal may be lost lock. In this paper, we propose a method to provide auxiliary Doppler frequency shift for tracking loops by using inertial information, so as to solve the problem of stable tracking of GNSS signals in high dynamic environment. The experimental results show that this method can significantly reduce the impact of high dynamic on the tracking loop when the carrier moves relative to the satellite at an acceleration of 50g, and the dynamic tracking performance of the receiver is obviously improved.