Comparison Study of GPS Carrier Phase and Two-Way Satellite Time and Frequency Transfer

A dual frequency GPS and a geostationary communication satellite based time and frequency transfer network have been established for the Asia-Pacific region. Some stations link to Europe with both methods. Consequently, we can compare the performance of GPS carrier phase time or frequency transfer to a two-way satellite time and frequency transfer, and vice versa. The difference between the two methods shows good consistency in the regional network. On the other hand, for intercontinental links there is an obvious variation with the diurnal and secular changes.