Journal of Astronautics ›› 2015, Vol. 36 ›› Issue (1): 90-95.doi: 10.3873/j.issn.1000-1328.2015.01.012

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An Algorithm for the Rubidium Atomic Clock Control Based on the Kalman Filter

FAN Duo sheng, SHI Shao hua, LI Xiao hui   

  1. 1. National Time Service Centre, Chinese Academy of Sciences,Xi’an 710600, China;
     2. Key Laboratory of Tim frequency Standard, National Time Service Center,
    Chinese Academy of Sciences, Xi’an 710600, China;
    3. University of the Chinese Academy of Sciences, Beijing 100190, China
  • Received:2013-10-14 Revised:2014-02-27 Online:2015-01-15 Published:2015-01-25

Abstract:

Taking the 1pps signal of the GPS receiver as the reference signal, the parameters of the rubidium atomic clock are estimated by using the Kalman filter and the frequency adjustment amount of the rubidium atomic clock is calculated, so that the rubidium atomic clock is adjusted properly to make the rubidium atomic clock and the UTC time synchronized. The experimental results show that, the standard deviation of the clock error between the output 1pps of the disciplined rubidium atomic clock and the UTC (NTSC) is no more than 3.5ns, the peak-to-peak of the clock error is less than 15ns, the Allan variance with 100s sampling is 1.83×10 -12 , the Allan variance with 10000s sampling is 6.1×10 -13 . Therefore it is can be proved that the rubidium atomic clock gets the better accuracy and the long term stability, while the short-term stability is minimally affected. The test also proves that the Kalman filter is a reliable and stable to control the rubidium atomic clock.

Key words: Rubidium atomic clock, Time measurement, Kalman filter

CLC Number: