A Long-Term Comparison Between GPS Carrier-Phase and Two-Way Satellite Time Transfer

K. Larson, L. Nelson, J. Levine, T. Parker, E. Powers

Abstract:	We have conducted GPS carrier-phase time-transfer experiments between the Master Clock at USNO in Washington, DC and the Alternate Master Clock at Schriever Air Force Base near Colorado Springs, Colorado. These clocks arc also monitored on an hourly basis with two-way satellite time-transfer (TWSTT) measurements. We compare the performance of the GPS carrier-phase and TWSTT systems over a 167-day period. Apart from an overall constant time offset (due to unknown delays in the GPS hardware at both ends), we find that the systems agree within f 1 ns, with a drift of 1.9+/-0.1 ps/d. For averaging times of a day, the carrier-phase and TWSTT systems have a frequency uncertainty of 2.5 and 5.5 parts in lo", respectively.
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:	247 - 256
Cite this article:	Larson, K., Nelson, L., Levine, J., Parker, T., Powers, E., "A Long-Term Comparison Between GPS Carrier-Phase and Two-Way Satellite Time Transfer," Proceedings of the 30th Annual Precise Time and Time Interval Systems and Applications Meeting, Reston, Virginia, December 1998, pp. 247-256.
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