Research on Satellite Signal Vector Tracking Based on Prefilter under High Dynamic Conditions

Under high dynamic circumstances, due to the doppler effect, the user's high dynamic changes will lead to the significant doppler frequency shift of the satellite signal, especially in the carrier part, which makes the signal loss of lock easily. This paper discusses an application of the UKF carrier tracking loop to solve the contradiction between noise bandwidth and dynamic range in the traditional loop, which makes receivers in high dynamic environment able to obtain more accurate tracking results, and it can be a prefilter for constructing a cascade vector tracking loop, then, the ability to work of this vector tracking loop is verified under high dynamic environment where the traditional loop cannot work normally. Finally, as a new field of combination between the signal processing and the information processing, the vector tracking loop can provide an efficient platform for the ultra-tight integration and even broader information fusion methods.