Abstract
Atomic clock frequency jumps directly influence the accuracy and reliability of timekeeping systems. The necessary corrections are typically implemented by postprocessing mutual comparison data between multiple atomic clocks based on the overly strict assumption that these atomic clocks are independent of each other. This paper describes the concept of a mirror clock, which enables atomic clock frequency jumps to be identified in real time without any assumptions. By comparing whether the real measured data and a corresponding mirror clock prediction fall within a confidence interval determined by the uncertainty of past physical clock data, atomic clock frequency jumps can be effectively identified and corrected. The results of several experiments using three hydrogen masers verify that the precision and recall of simultaneous jump identification reach 96.41% and 73.49%, respectively.
Funder
National Key R&D Program of China
National Science Foundation of China
Subject
Electrical and Electronic Engineering,Biochemistry,Instrumentation,Atomic and Molecular Physics, and Optics,Analytical Chemistry
Reference27 articles.
1. Local representations of UTC in national laboratories;Metrologia,2011
2. Davis, J.A., Shemar, S.L., and Whibberley, P.B. (2011, January 2–5). A Kalman filter UTC(k) prediction and steering algorithm. Proceedings of the 2011 Joint Conference of the IEEE International Frequency Control and the European Frequency and Time Forum (FCS), San Francisco, CA, USA.
3. Levine, J., and Parker, T. (2002, January 31). The algorithm used to realize UTC(NIST), Frequency Control Symposium and PDA Exhibition, 2002. Proceedings of the 2002 IEEE International Frequency Control Symposium and PDA Exhibition (Cat. No.02CH37234), New Orleans, LA, USA.
4. Research on Time Keeping at NIM;J. Metrol. Soc. India,2012
5. BeiDou Navigation Satellite System and its Timescales;Metrologia,2011