Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007acasn..48...71w&link_type=abstract
Acta Astronomica Sinica, vol. 48, no. 1, p.71-83
Astronomy and Astrophysics
Astronomy
5
Atomic Clock, Time Scale, Time Keeping, Noise
Scientific paper
It is well know that a hydrogen maser and a cesium clock show different predominance respectively in long or short term stability. As far as the long term stability is concerned, one would favor cesium clocks rather than hydrogen masers. On the contrary, the short term stability of a cesium clock is worse than that of a hydrogen maser. With the progress of technology, the long term stability of hydrogen masers has been significantly improved. In this paper, the basic theory of the noise of frequency standards is briefly depicted. The quantitative analysis on the data of the two hydrogen masers newly imported by NTSC from U.S. Symmetric has been compared with those of the cesium clocks of HP 5071A at NTSC. For the purpose of time keeping, the optimized way is initially sleeked to the time scale algorithm with a group of hydrogen masers and cesium clocks and to the option on whether to use a hydrogen maser or a cesium clock as the frequency source in the master clock system.
Wang Zhao-Ming
Yuan H.-B.
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