Analysis of system time performance in BeiDou satellite navigation system

As same as other satellite navigation systems, the time difference is considered as one of the basic observations in Beidou satellite navigation system. Therefore, an accurate and stable system time is crucial to realize the system function. Based on the inverse decomposition method, this paper analyzes the requirements of Beidou system time (BDT) on behalf of the Beidou System service. Three time transfer links, The Two-Way Satellite Time transfer, GPS Common-View Time Comparison and Beidou Common-View Time Comparison, are established between National Time Service Center and the Beidou system time center in order to obtain the time difference between BDT and UTC(NTSC). At last, the accuracy and stability of BDT are discussed based on the performance of these three links.