Research on the Methods of Performance Monitoring and Evaluation for Active Hydrogen Maserstwo |
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| Institution: | 1. National Time Service Center, Chinese Academy of Sciences, Xi’an 710600;2. Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Chinese Academy of Sciences, Xi’an 710600;3. University of Chinese Academy of Sciences, Beijing 100049;4. School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049;1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210034;2. Key Laboratory of Dark Matter and Space Astronomy, Chinese Academy of Sciences, Nanjing 210034;3. School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026;1. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030;2. Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Nanjing 210008;3. School of Information and Communication, Guilin University of Electronic Technology, Guilin 541004;1. National Space Science Center, Chinese Academy of Sciences, Beijing 100190;2. Key Laboratory of Science and Technology on Environmental Space Situation Awareness, Chinese Academy of Sciences, Beijing 100190;3. University of Chinese Academy of Sciences, Beijing 100049;1. Wits Business School, University of the Witwatersrand, 2 St. Davids Place, Parktown, Johannesburg 2193, South Africa;2. School of Business and Economics, University of Brunei Darussalam, Jalan Tungku Link, Gadong BE 1410, Brunei Darussalam;1. Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011;2. University of Chinese Academy of Sciences, Beijing 100049;3. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030;4. Department of Astronomy, Yunnan University, Kunming 650091 |
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| Abstract: | Active hydrogen maser is the main frequency standard for establishing and maintaining the time scale. It has the characteristics of high short-term stability and low phase noise. At present, it plays an increasingly important role in the international atomic time (TAI) and various local time scales. Firstly, in combination with the internal state parameters of an active hydrogen maser, the correlation between the internal state parameters and the comparison data of a hydrogen maser is analyzed, and a method for the performance monitoring of a hydrogen maser is proposed. Secondly, according to the characteristics of hydrogen maser performance, a method for evaluating the performance of a hydrogen maser is given. The hydrogen maser performance includes mainly two aspects, namely the frequency stability and predictability. The performances of two types of active hydrogen masers (CH1-75 and MHM-2010) are evaluated by this method. The correlation analysis of the atomic clock state parameters and comparison data shows that the state parameter monitoring can effectively predict the variation of the hydrogen maser performance. The evaluation results of atomic clock frequency stability and predictability show that the atomic clock with a higher medium-and-long term frequency stability has a better predictability. There are two methods for the predictability evaluation, one is based on the data published by BIPM (Bureau International des Poids et Measures), and another one is based on the quadratic model. Both methods are consistent with the weights published by BIPM. Therefore, the two methods can be used as a quantitative method to evaluate the predictability of a hydrogen maser. |
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| Keywords: | Astrometry Time methods: data analysis |
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