Evaluation and Monitoring on the Single Station Time Difference Based on the BDS, GPS and GLONASS Data

With the improvement and updating of GPS, GLONASS navigation system, and the gradual establishment of GALILEO and China’s BeiDou system (BDS) navigation system, Multi-system GNSS navigation systems have become the main research directions. In order to achieve the compatibility and interoperability among the GNSS systems, accurately determine the time difference between different systems is the key. Based on this, this paper adopted the GNSS observation data, which is the output of the multi-mode dual-band receiver, and the GNSS system’ navigation message to monitor the time difference between different GNSS navigation systems. Because the BIPM T bulletin has no BDS data, so the measured time difference data of GLONASS and GPS and the corresponding time difference data of BIPM T bulletin were used to be evaluated. In this paper, the maximum, minimum, mean, mean square error and the RMSE of BDS, GPS and GLONASS time difference data were accumulated. 310 days’ time difference data were used to evaluation the difference. The results show that the residual’ standard deviation between GLONASS, GPS time difference and the results of T bulletin is 4.28 ns, and the residual’ standard deviation between BDS and GPS, GLONASS system can reach 5 and 10 ns in optimal conditions.