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LORAN-C data reduction at the US Naval ObservatoryAs 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 Group Repetition Interval (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, as references to UTC(USNO) (Universal Coordinated Time) for all LORAN chains. This information is available to users via USNO publications and the USNO Automated Data Service (ADS).
Document ID
Document Type
Conference Paper
Harold Chadsey
(United States Naval Observatory Washington D.C., District of Columbia, United States)
Date Acquired
September 6, 2013
Subject Category
Aircraft Communications And Navigation
Meeting Information
Meeting: 23rd Annual Precise Time and Time Interval (PTTI) Applications and Planning Meeting
Location: Greenbelt, MD
Country: US
Start Date: June 30, 1992
Sponsors: Goddard Space Flight Center
Accession Number
Funding Number(s)
Distribution Limits
Work of the US Gov. Public Use Permitted.
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