三轴刚体地球的自由极移

The free polar motion of the triaxial rigid Earth

地球自转是天文学和地球科学共同的研究课题,对其研究有着重要的理论和实用意义。例如对地球自转速率与极移的研究,关系到确定地面观测站在宇宙空间的精确位置,以及地球参考系在空间的指向,这是地面精密测绘和宇宙飞船跟踪所需要的参数。本文基于地球自转Euler运动学方程和三轴刚体地球自转的Euler动力学方程,介绍了有关刚体地球自转的求解过程。并指出,如果在地球自转初始条件确定后,三轴刚体地球自转的自由摆动只能有一个。

The earth's rotation is common in astronomy and geoscience research,the research has important theoretical and practical significance.For example,the research of Earth's rotation rate and a polar motion related to ground-based observations to determine the precise location of the astrospace,as well as the the point of terrestrial reference system in the space,which is precision ground mapping and tracking spacecraft needed parameters.Based on the earth's rotation Euler kinematical equations and Euler dynamical equations on a triaxial rigid Earth's rotation,introduced the process of solving the earth's rotation of a rigid earth.Moreover,indicated that if the preliminary condition of Earth rotation is ensured,then there only is a normal model with regard to free wobble of triaxial rigid Earth rotation.