TIMING CALIBRATION OF THE NORTHEAST U.S.A. LORAN-C CHAIN

R.E. Keating, C.F. Lukac, G.H. Luther, L.G. Charron

Abstract:	The U.S. Naval Observatory (USNO), from the very first day of its establishment in 1830 as a chronometer rating office, to the present, has been deeply involved in the specialized field of Precise Time and Time Interval (PTTI). During this period of one and one half centuries, the accuracy specification that defines Precise Time and Time Interval, or "PTTI", has monotonically increased from seconds to nanoseconds! The second-PTTI era began in the early 1860's, when Western Union adopted USNO's 1 sec PTTI, which event led to the defacto use of Standard Time in most parts of the world. In 1904, Naval Radio Station NAA in Arlington, Virginia, began the first radio time transmissions of USNO's PTTI; and this event introduced the era of 0.001 sec PTTI. In May 1961, upon the delivery of LORAN-C timing receivers built to specification for the purpose, USNO began providing steering and control of the East Coast LORAN-C; and this event began the era of dissemination of 1 microsecond PTTI.
Published in:	Proceedings of the 18th Annual Precise Time and Time Interval Systems and Applications Meeting December 2 - 4, 1986 DuPont Plaza Hotel Washington, DC
Pages:	331 - 351
Cite this article:	Keating, R.E., Lukac, C.F., Luther, G.H., Charron, L.G., "TIMING CALIBRATION OF THE NORTHEAST U.S.A. LORAN-C CHAIN," Proceedings of the 18th Annual Precise Time and Time Interval Systems and Applications Meeting, Washington, DC, December 1986, pp. 331-351.
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