| タイトル | Performance of Soviet and US hydrogen masers |
| 著者（英） | Demidov, Nikolai A.; Uljanov, Adolph A.; Vessot, Robert F. C.; Allan, David W.; Winkler, Gernot M. R.; Mattison, Edward M. |
| 著者所属（英） | Quartz Research and Production Association |
| 発行日 | 1990-05-01 |
| 言語 | eng |
| 内容記述 | 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. |
| NASA分類 | LASERS AND MASERS |
| レポートNO | 91N25799 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/232058 |
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