重力场的时间变化与地球岁差章动
Temporal variations of the gravity field and Earth precession-nutation
摘要：
由于空间大地测量技术已达到一定的精度，并考虑到一些模型，一些地球重力场系数的时间变化可以确定。它们是由于地球海洋和固体潮汐，以及地球物理水库质量位移。它们可以与地球方位参数的变化有关（通过惯性张量）。然后，我们可以尝试通过这些重力变化的空间测量来提高我们对地球自转的认识。我们利用结合空间大地测量技术获得的数据进行了这样一项研究。特别是，我们使用的CHAMP数据对这种变化更敏感，并完成了已经积累的数据（例如Starlette和LAGEOS I）。在第一种方法中，我们专注于地球岁差章动，试图通过考虑地球动力学扁率的时间变化来改进它。其目标主要是了解大地测量学如何影响这一科学领域。这样，我们就可以把我们的计算结果与最新的岁差章动测定结果进行比较。
英文摘要：
Due to the accuracy now reached by space geodetic techniques, and also considering some modelisations, the temporal variations of some Earth Gravity Field coefficients can be determined. They are due to Earth oceanic and solid tides, as well as geophysical reservoirs masses displacements. They can be related to the variations in the Earth's orientation parameters (through the inertia tensor). Then, we can try to improve our knowledge of the Earth Rotation with those space measurements of the Gravity variations. We have undertaken such a study, using data obtained with the combination of space geodetic techniques. In particular, we use CHAMP data that are more sensitive to such variations and that complete the ones already accumulated (for example with Starlette and LAGEOS I). In this first approach, we focus on the Earth precession nutation, trying to refine it by taking into account the temporal variations of the Earth dynamical flattening. The goal is mainly to understand how Geodesy can influence this field of science. Like this, we will be able to compare our computation with up to date determinations of precession nutation.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
