High accuracy OMEGA timekeeping

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astrophysics, Atomic Clocks, Omega Navigation System, Satellite Tracking, Ships, Annual Variations, Diurnal Variations, Surface Navigation

Scientific paper

The Smithsonian Astrophysical Observatory (SAO) operates a worldwide satellite tracking network which uses a combination of OMEGA as a frequency reference, dual timing channels, and portable clock comparisons to maintain accurate epoch time. Propagational charts from the U.S. Coast Guard OMEGA monitor program minimize diurnal and seasonal effects. Daily phase value publications of the U.S. Naval Observatory provide corrections to the field collected timing data to produce an averaged time line comprised of straight line segments called a time history file (station clock minus UTC). Depending upon clock location, reduced time data accuracies of between two and eight microseconds are typical.

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