NDLI: The hydrogen maser and cesium clocks in time keeping at NTSC

Content Provider	IEEE Xplore Digital Library
Author	Yuan Haibo Qu Lili Dong Shaowu Li Wei Zhang Hong
Copyright Year	2009
Description	Author affiliation: National Time Service Center, CAS, BOX 18 Lintong Xi'an Shaanxi China 710600 (Yuan Haibo; Qu Lili; Dong Shaowu; Li Wei; Zhang Hong)
Abstract	Hydrogen masers and cesium clocks are two important kinds of precision frequency standard, and each of them has its own advantages in time keeping. It is important to investigate the way for effectively combining these two kinds of cocks in order to form a better atomic time scale. There are four hydrogen masers and eighteen Hp5071A cesium clocks at NTSC (National Time Service Center, the Chinese Academy of Sciences). Two of the hydrogen masers are MHM-2010 which is manufactured by symmetricom, and the other two are made in Shanghai Astronomy Observatory (SHAO), the Chinese Academy of Sciences. It is well known that the advantage of a Hydrogen maser is concentrated on its short term stability; however its frequency could drift when it runs for long term. The advantage of a cesium clock is its long term stability; however its short term stability is worse than that of a hydrogen maser. In addition, clocks, even though are of the same kind, their performance could be very different because of their noise and other factors. In this paper, the performance of atomic clocks at NTSC is studied through the analysis of their noises. In atomic time scale algorithm, the short term stability and the long term stability of each clock are considered separately, which makes the frequency of time scale more stable for both long and short terms. For calculating the weight of a group of clocks the difference between Allan deviation and standard deviation is discussed in detail.
Starting Page	639
Ending Page	642
File Size	5470750
Page Count	4
File Format	PDF
ISBN	9781424435111
ISSN	10756787
DOI	10.1109/FREQ.2009.5168261
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-04-20
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Hydrogen Masers Frequency Atomic clocks Performance analysis Stability analysis Content addressable storage Manufacturing Astronomy Observatories
Content Type	Text
Resource Type	Article

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Performance of Hydrogen Maser and Its Usage in Local atomic time at NTSC

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