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The calibration uncertainty (uB) is the dominant part in the total uncertainty budget of the UTC generation [1,3]. There are two calibration strategies: (a) Receiver calibration and (b) Time link calibration. The state-of-the-art [1,4,5] of the uB is of order 5 ns for GNSS time transfer based on the strategy (a) and is 1 ns for TWSTFT based on the strategy (b) in which the absolute offset is canceled...
Accurate GNSS (Global Navigation Satellite System) time transfer needs accurate satellite orbit information. Since Nov. 2009, the GLONASS time transfer is introduced in UTC generation. The precise and timely GLONASS orbit information is indispensable for Circular T computation. In this paper, we compare the GLONASS orbits produced by different analysis centers. We study the differences of the products,...
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