Abstract
The nature of satellite navigation can be seen as a time measurement. Time measurement is the basic for satellite navigation. First, the time scale of satellite navigation system is the basic for the system operation, and the accuracy of time measurement determines the accuracy of satellite orbit. It can be said that the accuracy of the time determines the accuracy of satellite navigation to a certain extent. BDT is the system time of the beidou satellite navigatin, It is established and maintained by the ground operation control system, BDT is the reference time of the entire ground operation control system and is also the reference time of satellite, thus ensuring the consistency of the satellite time and the ground time. The definition and realization of the BDT are introduced. The time and frequency system to maintain BDT and its performance are briefly described. The measurement methods of BDT/GPST time offset are introducted, the measurement results are analysied, the prediction modelling time offset is studited, the 1st, 2nd and 3rd order ploynomial model are given, 1~2ns precision could be got in BDT-GPST prediction, if the system time stability or the receiver observation precision are improved, the higher precision could be reached in future.
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