A Comparison of the Highest Precision Commonly Available Time Transfer Methods: TWSTT and GPS CV

James A. DeYoung, Francine Vannicola, Angela D. McKinley

Abstract:	The U.S. Naval Observatory (USNO) in Washington, D.C., is now operating its Alternate Master Clock (AMC), located at Falcon Air Force Base, Colorado. UTC(USNO)-UTC(AMC) is determined independently by the Global Positioning System (GPS) common view (CV) and the Two-Way Satellite Time Transfer (TWSTT) method. The GPS CV time transfer data are formed from strict 13-minute common-view tracks. The TWSTT data are single 5-minute runs taken once every hour. In this study, the performances of the GPS CV time transfers from Standard Positioning Service (SPS) CIA code single-channel receivers using the modeled ionosphere, Precise Positioning Service (PPS) dual-frequency receivers using the measured ionosphere, and TWSTT are compared.
Published in:	Proceedings of the 28th Annual Precise Time and Time Interval Systems and Applications Meeting December 3 - 5, 1996 Hyatt Regency Reston Town Center Reston, Virginia
Pages:	349 - 356
Cite this article:	DeYoung, James A., Vannicola, Francine, McKinley, Angela D., "A Comparison of the Highest Precision Commonly Available Time Transfer Methods: TWSTT and GPS CV," Proceedings of the 28th Annual Precise Time and Time Interval Systems and Applications Meeting, Reston, Virginia, December 1996, pp. 349-356.
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