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arXiv 0907.4849stat.APmath.PRmath.STstat.TH
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Cs喷泉零密度频率的Bayes估计

Bayesian estimate of the zero-density frequency of a Cs fountain

D Calonico, F Levi, L Lorini, G Mana

摘要:

铯喷泉频率标准在国际单位制中排名第二,相对不确定度接近10^-16。在对精度预算的主要贡献中,冷碰撞由于参考原子跃迁的原子密度漂移而起重要作用。本文介绍了应用贝叶斯分析的时钟频率估计的密度漂移,并介绍了如何贝叶斯定理允许先验知识的碰撞系数的符号被严格嵌入到分析。作为一个应用程序,从INRIM铯喷泉的数据进行了比较,贝叶斯和正统的分析。贝叶斯定理可使正统不确定度降低28%,是一种重要的频率计量方法。

英文摘要:

Caesium fountain frequency-standards realize the second in the International System of Units with a relative uncertainty approaching 10^-16. Among the main contributions to the accuracy budget, cold collisions play an important role because of the atomic density shift of the reference atomic transition. This paper describes an application of the Bayesian analysis of the clock frequency to estimate the density shift and describes how the Bayes theorem allows the a priori knowledge of the sign of the collisional coefficient to be rigourously embedded into the analysis. As an application, data from the INRIM caesium fountain are used and the Bayesian and orthodox analyses are compared. The Bayes theorem allows the orthodox uncertainty to be reduced by 28% and demonstrates to be an important tool in primary frequency-metrology.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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