LORAN-C Data Reduction at the U.S. Naval Observatory

Harold Chadsey

Abstract:	As part of its mission and in cooperation with the U.S. Coast Guard, the U.S. Naval Observatory (USNO) monitors and reports the timing of the LORAN-C chains. The procedures for monitoring and processing the reported values have evolved with advances in monitoring equipment, computer interfaces and PCs. This paper discusses the current standardized procedures used by USNO to sort the raw data according to GRI rate; to fit and smooth the data points; and, for chains remotely monitored, to tie the values to the USNO Master Clock. The results of these procedures are the LORAN time of transmission values, us referenced to UTC(USNO) for all LORAN chains. This information is available to users via USNO publications and the USNO Automated Data Service (ADS).
Published in:	Proceedings of the 23th Annual Precise Time and Time Interval Systems and Applications Meeting December 3 - 5, 1991 Pasadena, California
Pages:	103 - 110
Cite this article:	Chadsey, Harold, "LORAN-C Data Reduction at the U.S. Naval Observatory," Proceedings of the 23th Annual Precise Time and Time Interval Systems and Applications Meeting, Pasadena, California, December 1991, pp. 103-110.
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