Performance of Soviet and US hydrogen masers

Details Performance of Soviet and US hydrogen masers Performance of Soviet and US hydrogen masers

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ptti.meet..509u&link_type=abstract

In JPL, The 22nd Annual Precise Time and Time Interval (PTTI) Applications and Planning Meeting p 509-523 (SEE N91-25755 17-70)

Statistics

Applications

Frequencies, Frequency Stability, Global Positioning System, Hydrogen Masers, Stability, Drift Rate, Observatories, United States

Scientific paper

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 Global Positioning System (GPS) common-view measurements, with three primary frequency-reference scales. The best masers were found to have fractional frequency stabilities as low as 6 times 10(exp -16) for averaging times of approximately 10(exp 4) s. Members of the USNO maser ensemble provided frequency prediction better than 1 times 10(exp 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(exp -15), with serveral masers achieving residual stabilities well below 1 times 10(exp -15) for intervals from 10(exp 5)s to 2 times 10(exp 6)s. The fractional frequency drifts of the 13 masers studied, relative to the primary reference standards, ranged from -0.2 times 10(exp -15)/day to +9.6 times 10(exp -15)/day.

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