|
|
|
| A Method for Estimating Frequency Stability of Atomic Clock |
| WANG Yu-zhuo,ZHANG Ai-min,ZHANG Yue,YANG Zhi-qiang |
| National Institute of Metrology, Beijing 100029, China |
|
|
|
|
Abstract To evaluate reasonably the absolute frequency stability of atomic clocks in the same experimental condition, this paper analyzed the algorithm model and solving process theoretically and studied the method for estimating absolute frequency stability when correlated noises exsisted. It is evaluated by the simulated data of three atomic clocks. Under the assumption of independent noises, the deviation between the test result and theoretical value became larger with the increase of the noise correlation. Considering the noise correlation, the relative error of the test result is always less than 1.7%. The effectiveness of the method was further proved with 360-day real data of four cesium clocks in NIM (National Institute of Metrology) time keeping lab.
|
|
Received: 24 February 2017
Published: 12 April 2018
|
|
|
|
|
|
［1］Levine J. Invited Review Article: The statistical modeling of atomic clocks and the design of time scales［J］. Review of Scientific Instruments, 2012, 83(2):021101-28.
［2］Tavella P. Statistical and mathematical tools for atomic clocks［J］. Metrologia, 2008, 45(6):S183-S192.
［3］Zhang A, Gao Y, Liang K, et al. Research on Time Keeping at NIM［J］. Mapan-Journal of Metrology Society of India, 2012, 27(1):55-61.
［4］Arias E F, Panfilo G, Petit G. Timescales at the BIPM［J］. Metrologia, 2011, 48(4):S145-S153.
［5］Vernotte F, Delporte J, Brunet M. A re-revisited three cornered hat method for estimating clock instabilities［C］// 18th European Frequency and Time Forum. Guildford, UK, 2004:128-133.
［6］Gao C, Wang B, Zhu X, et al. Investigating the correlation between hydrogen-maser clocks in the same place［C］//2015 Joint Conference of the IEEE International Frequency Control Symposium and the European Frequency and Time Forum. Denver, CO, USA, 2015:562-564.
［7］Tavella P, Premoli A. Estimating the Instabilities of N Clocks by Measuring Differences of their Readings［J］. Metrologia, 2005, 30(30):479-486. |
|
|
|
2018, Vol. 39 
