用OCCAM 6.1 VLBI软件严格确定的精密长期章动序列的分析和比较
Analysis and comparison of precise long-term nutation series, strictly determined with OCCAM 6.1 VLBI software
摘要：
由Véronique Dehant领导的IAU/IUGG“非刚性地球章动”工作组因其为地球岁差和章动开发新模型的工作而获得2003年欧洲笛卡尔奖。该模型（MHB 2000，Mathews等人，2002年）在2000年曼彻斯特大会期间被IAU（国际天文学联合会）采用。它是基于（i）由于VLBI技术对岁差模型的某些改进（相对于Lieske等人1977年的前一个），和（ii）一个非常精确的章动模型，接近观测。有了这个奖，笛卡尔章动项目可以为国际科学家提供一些赠款，用于进一步改进岁差章动地球模型。在IGG（Institute of Geodesy and Geophysics），我们利用OCCAM 6.1 VLBI分析软件和现有的最佳数据和模型，重新分析了整个VLBI时段（从1985年到2005年）的地球定向参数（EOP）。在本文中，我们提出的EOP和更特别的章动系列所获得的结果。我们将其与其他IVS分析中心的结果以及分析协调员的IVS合并EOP系列进行比较。除了极运动坐标相对于其他坐标发生了位移，我们在这里讨论的是，这些级数是一致的。最后，我们分析章动系列的框架内的自由核心章动（FCN）的研究和建模。
英文摘要：
The IAU/IUGG Working Group on "Nutation for a non-rigid Earth", led by Véronique Dehant, won the European Descartes Prize in 2003, for its work developing a new model for the precession and the nutations of the Earth. This model (MHB2000, Mathews et al. 2002) was adopted by the IAU (International Astronomical Union) during the General Assembly in Manchester, in 2000. It is based (i) on some improvements for the precession model (with respect to the previous one of Lieske et al. 1977) owing to the VLBI technique, and (ii) on a very accurate nutation model, close to the observations. With this prize, the Descartes nutation project could offer for international scientists some grants, to be used for further improvements of the precession-nutation Earth model. At the IGG (Institute of Geodesy and Geophysics), with the OCCAM 6.1 VLBI analysis software and the best data and models available, we re-analyzed the whole VLBI sessions available (from 1985 till 2005) solving for the Earth Orientation Parameters (EOP). In this paper we present the results obtained for the EOP and more particularly for the nutation series. We compare them with the other IVS analysis centers results, as well as with the IVS combined EOP series from the analysis coordinator. The series are in good agreement, except for the polar motion coordinates that show a shift with respect to the other ones and that we discuss here. Finally, we analyse the nutation series in the framework of the free core nutation (FCN) study and modelisation.
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