PERFORMANCE OF SOVIET AND U.S. HYDROGEN MASERS

Adolf A. Uljanov, Nikolai A. Demidov, Edward M. Mattison, Robert F.C. Vessot, David W. Allan, Gernot M.R. Winkler

Abstract:	The frequencies of Soviet- and U.S.-built hydrogen masers located at the Smithsonian Astrophysical Observatory and at the United States Naval Observatory (USNO) were compared with each other and, via GPS common-view measurements, with three primary frequency-reference scales. The best masers were found to have fractional frequency stabilities as low as 6x10-16 for averaging times of approximately 104 s. Members of the USNO maser ensemble provided frequency prediction better than 1x10-14 for periods up to a few weeks. The frequency residuals of these masers, after removal of frequency drift and rate of change of drift, had stabilities of a few parts in 10-15, with several masers achieving residual stabilities well below 1x10-15 for intervals from 10-s to 2x10° s. The fractional frequency drifts of the 13 masers studied, relative to the primary reference standards, ranged from -0.2x10-15/day to +9.6x10-15/day.
Published in:	Proceedings of the 22th Annual Precise Time and Time Interval Systems and Applications Meeting December 4 - 6, 1990 Sheraton Premiere Hotel Vienna, Virginia
Pages:	509 - 524
Cite this article:	Uljanov, Adolf A., Demidov, Nikolai A., Mattison, Edward M., Vessot, Robert F.C., Allan, David W., Winkler, Gernot M.R., "PERFORMANCE OF SOVIET AND U.S. HYDROGEN MASERS," Proceedings of the 22th Annual Precise Time and Time Interval Systems and Applications Meeting, Vienna, Virginia, December 1990, pp. 509-524.
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