地球自由核章动的经验模型
Empiric Models of the Earth's Free Core Nutation
摘要：
自由核章动（FCN）是限制地球自转轴运动在天球坐标系中建模精度的主要因素。已经提出了几种FCN模型。对已有的模型进行了比较分析，包括作者提出的模型。使用的FCN模型，大大提高了地球自转的建模精度。此外，从观测到的地球自转轴运动中提取的FCN分量是研究地核形状和自转的重要来源。不同FCN模型的比较表明，该模型是优于其他模型，如果用来提取地球物理信号（FCN的振幅和相位）从观测数据。
英文摘要：
Free core nutation (FCN) is the main factor that limits the accuracy of the modeling of the motion of Earth's rotational axis in the celestial coordinate system. Several FCN models have been proposed. A comparative analysis is made of the known models including the model proposed by the author. The use of the FCN model is shown to substantially increase the accuracy of the modeling of Earth's rotation. Furthermore, the FCN component extracted from the observed motion of Earth's rotational axis is an important source for the study of the shape and rotation of the Earth's core. A comparison of different FCN models has shown that the proposed model is better than other models if used to extract the geophysical signal (the amplitude and phase of FCN) from observational data.
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