Common-View time transfer experiment based on COMPASS-M1 satellite

The COMPASS Common-View time transfer experiment was done between National Time Service Center (NTSC) and Shanghai Observation (SHAO) via COMPASS-M1 satellite (MEO) in December in 2007 for the first time. NTSC is about 2000 km away from SHAO, and Cs atomic clock is equipped at each station. Our data processing method is as follows. The troposphere delay is calculated based on meteorological data, and the ionosphere delay is calculated based on IGS TEC Map. The satellite orbit obtained is about 10m accuracy, and then the clock difference between NTSC and SHAO is calculated with Common-View method. After that, the clock difference from Common-View is compared with that from Two-Way Satellite Time and Frequency Transfer (TWSTFT). The experiment result and analysis indicate that the accuracy of Common-View time transfer via COMPASS-M1 satellite is better than 10 nanoseconds.