Time Transfer via GPS at USN0

Mihran Miranian and William J. Klepczynski

Abstract:	The USN0 monitors the timing of the Global Positioning System (GPS) to provide a reliable and stable coordinated time reference for the system. This is in conformance with DOD Instruction 5000.2 of 23 Feb 91. Government and civil laboratories use USN0 GPS data for time transfer and synchronization with the USN0 Master Clock. Unclassified data are available to users through the USN0 publications and the USN0 Automated Data Service (ADS). This paper discusses USN0 GPS operations and data reduction methods. It describes the GPS monitoring equipment at USN0 and the current satellite tracking schedule. Data format and segments are discussed, including their use in the reduction process. The paper also describes the time transfer technique used between USN0 and its remote Data Acquisition Sites (DAS) and how clocks at the remote sites are being steered to USN0 time. Finally, the paper outlines recommended procedures for use of the USN0 GPS data for precise time transfer.
Published in:	Proceedings of the 4th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1991) September 11 - 13, 1991 Albuquerque, NM
Pages:	215 - 222
Cite this article:	Miranian, Mihran, Klepczynski, William J., "Time Transfer via GPS at USN0," Proceedings of the 4th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1991), Albuquerque, NM, September 1991, pp. 215-222.
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