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Research on a frequency stability estimation method for rubidium atomic clock

SHI Xiao-yang;ZHANG Ran;LIU Dan;YAN Dong-liang;Beijing Institute of Radio Metrology and Measurement;  
Frequency stability is the most important parameter in the measurement characteristics of rubidium atomic clock.Based on research of the frequency stability of rubidium atomic clock, a calculation method combining robust least square and improved Allan variance is proposed.The error caused by frequency drift in Allan variance is compensated by stable frequency drift, and it is used to reduce the test error in the traditional frequency stability calculation method and to improve the accuracy of the test results.The algorithm is verified by the measured time deviation data in the metrology laboratory, and the results show that the algorithm can effectively derease the influence of stable frequency drift and can be used for the frequency stability measurement of atomic clock.
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