Abstract
The time transfer based on satellite navigation system is adopted widely in the international time comparison. The main methods of time laboratories comparison are GPS common-view and GPS PPP in the international comparison links. Because of its mature technology and standard specification in traditional method, GPS common view is the most convenient technology in the precise time transfer field. In this paper, four data processes methods are used to calculate the time difference between two time laboratories, such as direct common view, standard common view as CGGTTS, carrier phase smoothed code in direct common view and carrier smoothed code modifying the CGGTTS. At the end of paper, the comparison of these methods is analyzed on the precision and frequency stability. The results show that the phase smoothing method can get a better accuracy in time transfer.KeywordsTime transferSmoothed codeSlip detectingBeiDou common view
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