GPS/Loran-C Interperability Or Time And Frequency Applications- A Survey Of The Times Of Arrival Of Loran-C Ikansmissions via GPS Common Mode/Common View Satellite Observations

Bruce Penrod, Richard Funderburk, Peter Dana, Consultant

Abstract:	Now that GPS has entered the Selective Availability (SA)era of intentional degradation of the time and frequency stability of its signals, renewed possibilities for Loran-C exist. For frequency control purposes Loran-C, where available, is clearly superior to GPS under SA. This paper addresses the possibility that Loran-C might offer comparable time transfer accuracy and stability as well, if compliance with Public Law 100-223, Section 310 concerning synchronization of Loran-C to UTC is achieved and adequate propagation modeling is employed. This paper presents Time of Arrival (TOA) data taken on Loran-C groundwave transmissions from the Southeast U.S., Great Lakes, West Coast U.S. and Northeast U.S. chains received at Austron, Inc. in Austin, Texas during the fall of 1990. These TOA observations are referenced to UTC via common view GPS observations with the USNO, and are corrected for receiver delays and propagation delays using three different mixed-path models. The antenna ambient temperature was logged during the duration of the data taking in order to assess its correlation with TOA. Analysis of the data via linear regression on time and antenna temperature is performed on the individual transmitters as well as the ensemble, and these results are presented graphically. Unfortunately, gross (5 uS) timing errors still exist between the chains, making it necessary to apply corrections to the data from the Southeast U.S. and Great Lakes chains in order to obtain meaningful statistics.
Published in:	Proceedings of the 1991 National Technical Meeting of The Institute of Navigation January 22 - 24, 1991 Sheraton San Marcos Hotel Phoenix, AZ
Pages:	259 - 268
Cite this article:	Penrod, Bruce, Funderburk, Richard, Dana, Peter, Consultant,, "GPS/Loran-C Interperability Or Time And Frequency Applications- A Survey Of The Times Of Arrival Of Loran-C Ikansmissions via GPS Common Mode/Common View Satellite Observations," Proceedings of the 1991 National Technical Meeting of The Institute of Navigation, Phoenix, AZ, January 1991, pp. 259-268.
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