The Tracking Algorithm Analysis and Simulations for BeiDou B1 Signal*

The satellite signal tracking module is an important component of Beidou receiver which has a direct effect on receiver positioning accuracy and dynamic performance. Based on the analysis of the signal model in tracking loops of receiver, the frequency discrimination and phase discrimination methods are determined via simulations. Considering the different order of incentive compositions contained in the received Beidou signal caused by the relative motion between receiver antenna and satellite, the carrier loop filter based on the third-order Phase Locked Loop (PLL) with second-order Frequency Locked Loop (FLL) assist and the second-order code loop filter are designed to solve the poor tracking accuracy of low-order tracking loops under high-order dynamic stress. Finally, the performance of signal tracking algorithm applied in Beidou receiver is evaluated through the data generated by Beidou satellite simulator. The pseudo-range single point positioning results indicate that the signal tracking algorithm presented in this paper can meet the dynamic requirements as well as get higher tracking accuracy.