GPS/Loran-C Interoperability for Time and Frequency Applications - A Survey of the Times of Arrival of Loran-C Transmissions via GPS Common Mode/Common View Satellite Observations

Bruce Penrod, Richard Funderburk, Peter Dana-Consultant

Abstract:	Since the advent of GPS satellite based time and frequency transfer the role of Loran-C in this application has been greatly diminished. The capabilities of undegraded GPS are indeed superior to those of the Loran-C system in most respects including coverage, absolute timing accuracy, and ease of use. However potential drawbacks of GPS to the time and frequency user exist, such as higher cost, more complex hardware and non-civilian control of the system. This last has brought us the specter of Selective Availability (SA), an on again-off again, intentional degradation of the accuracies obtainable from the GPS. Though not the focus of this report, it should be noted that the medium term (T =780 seconds) frequency stability of the Loran-C transmissions, for reasonably close transmitters, is almost two orders of magnitude better than that of the GPS transmissions observed under SA-reason enough to keep Loran-C in mind for frequency control purposes. This paper surveys the absolute time setting performance achievable from seven distinct transmitters in four North American chains via the Loran-C Time of Coincidence (TOC) with UTC synchronization technique.
Published in:	Proceedings of the 22th Annual Precise Time and Time Interval Systems and Applications Meeting December 4 - 6, 1990 Sheraton Premiere Hotel Vienna, Virginia
Pages:	559 - 574
Cite this article:	Penrod, Bruce, Funderburk, Richard, Dana-Consultant, Peter, "GPS/Loran-C Interoperability for Time and Frequency Applications - A Survey of the Times of Arrival of Loran-C Transmissions via GPS Common Mode/Common View Satellite Observations," Proceedings of the 22th Annual Precise Time and Time Interval Systems and Applications Meeting, Vienna, Virginia, December 1990, pp. 559-574.
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