Abstract:

In the case of carrier rotation, the navigation satellite signal received by receiver will have additional lager Doppler frequency shift, resulting in a decline in the receiver tracking performance and even failure. In order to solve this problem, a scheme is proposed to help the receiver track navigation satellite normally with rotating carrier. Based on traditional loop, the adding of auxiliary channel realizes real-time estimation of rotating speed to assist loop tracking. Simulation proves that the improved loop can effectively reduce the adverse effects caused by carrier rotation and achieve normal signal tracking.

Key words: carrier rotation, navigation satellite signal, tracking loop, doppler frequency shift