A Precise GPS-Based Time and Frequency System

Jack Mc Nabb, Earl Fossler

Abstract:	This paper describes an approach to implementing a compact, highly reliable and precise Master Time and Frequency subsystem usable in a variety of applications. These applications include, among others, Satellite Ground Terminals, Range Timing Stations, Communications Terminals, and Power Station Timing subsystems. All time and frequency output signals are locked to Universal Time via the GPS Satellite system. The system provides for continued output of precise signals in the event of GPS signal interruption from antenna or &ad-in breakage or other causes. Cost/performance tradeoffs affecting system accuracy over the short, medium and long term are discussed. A unique approach to redundant system design provides an architecture with the reliability advantage of triple-redundant majority voting and the cod advantages of dual-redundant elements. The system can be configured to output a variety of precise time and frequency signals and the design can be tailored to output as few, or as many, types and quantities of signals as are required by the application.
Published in:	Proceedings of the 24th Annual Precise Time and Time Interval Systems and Applications Meeting December 1 - 3, 1992 Ritz-Carlton Hotel McLean, Virginia
Pages:	173 - 184
Cite this article:	Nabb, Jack Mc, Fossler, Earl, "A Precise GPS-Based Time and Frequency System," Proceedings of the 24th Annual Precise Time and Time Interval Systems and Applications Meeting, McLean, Virginia, December 1992, pp. 173-184.
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