【作者】 屈俐俐； 李变；

【Author】 QU Li-li 1,2 ,LI Bian 1,2 (1.National Time Service Center,Chinese Academy of Sciences Xi’an 710600 2.Key Laboratory of Time and Frequency Primary Standards,Chinese Academy of Sciences Xi’an 710600)

【机构】 中国科学院国家授时中心； 中国科学院时间频率基准重点实验室；

【摘要】 每一台钟的频率波动和长期频率变化都由各种不同噪声组合而成,依据钟的历史记录以及钟与钟之间的频率变化规律,利用Hilbert-Huang变换将整个过程进行平稳化处理,采用经验模态分解方法(EMD),把复杂信号分解为本征模态函数(IMF)的单分量信号,原子钟频率经过EMD分解,信号被分解成一系列具有不同特征尺度的IMF分量,针对不同的应用目的,通过对不同的分量进行分析研究,获得每一台原子钟的主要性能特征。更多还原

【Abstract】 The frequency fluctuations and long-term changes in frequency of each clock are combined by various noise, according to the historical record of the clock as well as the frequency variation between clock and clock,the entire process of smoothing processing is used by Hilbert-Huang transform,a complex signal is decomposed into single component signals of intrinsic mode function(IMF)by using empirical mode decomposition method(EMD),atomic clock frequency by decomposed by EMD,signal is decomposed into a series of different characteristic scales of the IMF component,for different application purposes,the main performance characteristicsaccess of each atomic clock is got by the different component analysis.更多还原