由VLBI资料计算自由核章动参数
Parameters of the Free Core Nutation from VLBI Data
摘要：
为了确定自由核章动（FCN）的参数，对几个VLBI EOP系列进行了研究。利用频谱分析和小波分析研究了FCN的振幅和周期。我们的分析揭示了FCN章动的振幅（已知也从其他调查）和周期（或相位）的变化。FCN振幅在0.1- 0.3mas之间变化，FCN周期在415- 490太阳日之间变化。后者也可以用FCN阶段的变化来解释。通过比较不同作者和不同方法得到的FCN周期和振幅的时间变化，发现在观测周期的边缘存在很大的差异。
英文摘要：
Several VLBI EOP series were investigated with goal of determination of parameters of the Free Core Nutation (FCN). Both the amplitude and period of the FCN were studied using spectral and wavelet analysis. Our analysis reveals a variability of both the amplitude (known also from other investigations) and the period (or phase) of the FCN nutation. The FCN amplitude varies in the range about 0.1--0.3 mas, and the FCN period -- in the range about 415--490 solar days. The latter may be also explained by changes in the FCN phase. Comparison of time variations of the FCN period and amplitude obtained by different authors and methods shows substantial discrepancies at the edges of the period of observations.
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