First Results on a Transatlantic Time and Frequency Transfer by GPS Carrier Phase

G. Dudle, F. Overney, L. Prost, T. Schildknecht, T. Springer, P. Hetzel, E. Powers

Abstract: Time and frequency transfer by GPS carrier phase, also referred to as Geodetic Time Transfer (GeTT), has been studied intensively in the frame of a collaboration between the Swiss Federal Office of Metrology (OFMET) and the Astronomical Institute of the University of Berne (AIUB). Two terminals equipped with geodetic GPS receivers have been built and were successfully deployed over European baselines. The study has demonstrated the low instrumental noise of GeTT (oy(r) = 10^-13 at r = 100 s) which makes this method an ideal tool for frequency comparisons between high performance clocks since much shorter averaging times are required than with GPS common view. This new time and frequency transfer method is now to be tested over longer baselines. In this paper we report on a transatlantic campaign between the Physikalisch-Technische Bundesanstalt in Germany (PTB) and the US Naval Observatory, Washington (USNO). Besides the longer baseline the choice of these two sites offers also the possibility to compare frequently GeTT and TWSTFT. The paper outlines the main parts of a GeTT campaign and summarizes the first results of time and frequency transfer by GPS carrier phase between RB and USNO.
Published in: Proceedings of the 30th Annual Precise Time and Time Interval Systems and Applications Meeting
December 1 - 3, 1998
Hyatt Regency Reston Town Center
Reston, Virginia
Pages: 271 - 280
Cite this article: Dudle, G., Overney, F., Prost, L., Schildknecht, T., Springer, T., Hetzel, P., Powers, E., "First Results on a Transatlantic Time and Frequency Transfer by GPS Carrier Phase," Proceedings of the 30th Annual Precise Time and Time Interval Systems and Applications Meeting, Reston, Virginia, December 1998, pp. 271-280.
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