宇航计测技术

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原子钟频率稳定度测试中的噪声处理

李树洲1；蔺玉亭1；邹本杰1   

  1. 1、北京环球信息应用开发中心，北京 100094
  • 出版日期:2012-10-15 发布日期:2012-10-15

Processing of Noise In Frequency Stability Measurement of Atomic Clocks

LI Shu-zhou1；LIN Yu-ting1；ZOU Ben-jie1   

  1. 1、Beijing Global Information Center of Application and Exploration, Beijing 100094
  • Online:2012-10-15 Published:2012-10-15

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摘要： 原子钟的测量噪声会被引入到频率稳定度评估过程，尤其是对中短期频率稳定度的影响更大。重叠Allan方差可以克服调频闪变噪声和调频随机游走噪声随时间变化出现的非平稳问题，但由于受到测量噪声的影响，评估结果仍会出现误差。为此，本文通过对原子钟的数学模型和噪声特性进行分析，提出了原子钟频率稳定度评估的加窗平滑噪声处理方法，通过对时差观测序列合理的加窗设计和平滑处理，抑制测量噪声对评估结果的影响。实验结果表明，利用铷钟观测序列的100点平滑可以有效地提高短期频率稳定度结果（100~1 000）s的可信度。

关键词: 原子钟, 频率稳定度, 重叠Allan方差, 加窗平滑

Abstract:

Measurement noise of atomic clocks influences the evaluation of frequency stability, especially for the short term and medium term frequency stability. Overlapping Allan variance can overcome in-stability due to FFM and RWFM noise variety along with time, but the result is influenced by measure noise. The method of evaluating frequency stability for atomic clocks is given basing on mathematic model and noise characteristic of atomic clocks. A processing method using smoothing window is presented. The noise of time difference sequence is restrained through adding window and smoothing. A experiment is executed with time difference sequence of rubidium clock, and the result shows that the reliability of short term stability(100~1 000)s can be improved by 100 points smoothing method.

Key words: Atomic clocks, Frequency stability, Overlapping Allan variance, Smooth in window

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