Time Transfer Using GPS Carrier-Phase Methods

Kristine Larson, Judah Levine

Abstract:	We have conducted several time-transfer experiments using the phase of the GPS carrier rather than the code, as is done in current GPS-based time transfer systems. We used data from geodetic quality "off-the-shelf" dual-frequency GPS receivers, where up to 8 satellites can be simultaneously observed. We connected two GPS receivers to two different atomic clocks at NIST. The antennas connected to the receivers were separated by about 40 m. The time difference between the clocks connected to the GPS receivers was estimated using weighted least-squares methods and carrier phase data. These relative clock estimates were then compared with the NIST time-scale system. We find agreement between the two methods of 55-80 picoseconds over periods of a week.
Published in:	Proceedings of the 29th Annual Precise Time and Time Interval Systems and Applications Meeting December 2 - 4, 1997 Sheraton Long Beach Hotel Long Beach, California
Pages:	221 - 228
Cite this article:	Larson, Kristine, Levine, Judah, "Time Transfer Using GPS Carrier-Phase Methods," Proceedings of the 29th Annual Precise Time and Time Interval Systems and Applications Meeting, Long Beach, California, December 1997, pp. 221-228.
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