A New Joint Tracking Method of BeiDou B1C Signal and Its Influence on Signal Quality Evaluation

Aiming at the problem of low accuracy of traditional open-loop tracking and long time-consuming of closed-loop tracking, this paper proposes a joint open-loop and closed-loop tracking method of BeiDou B1C signal, which not only ensures the tracking accuracy but also greatly reduces the time-consuming of signal tracking. To verify the effectiveness and feasibility of the proposed algorithm, this paper uses the 40-m large aperture antenna system of Haoping observation station to collect the measured satellite signal data for verification and makes in-depth analysis from tracking time-consuming, correlation peak, correlation loss, zero-crossing deviation of S-curve, code and carrier phase consistency, etc. The results show that under the condition of the same tracking parameters when the data length ratio of the open-loop and the closed-loop parts is 9:1, the time of the method is saved about 90% compared with the closed-loop tracking method; at the same time, the difference of the three evaluation parameters is within 1%, which verifies the effectiveness and feasibility of the proposed method. The research results can provide a theoretical basis and technical support for parallel processing of navigation signals and automatic quasi-real-time signal quality monitoring and evaluation in the future.