刚体地球CIP轴的极移和岁差章动

POLAR MIGRATION AND NUTATION OF CIP AXIS OF RIGID EARTH

基于刚体地球极移和章动的联合动力学方程,给出了CIP轴的极移、岁差章动动力学方程,在顾及到5 阶岁差章动力矩的情况下,给出了CIP轴的岁差章动表达式。通过推导发现,奇数阶引潮力位产生的岁差章动力 矩使得黄经章动和交角章动出现了异向项(即:黄经章动出现了cos项,交角章动出现了sin项)。

Based on the combined dynamical equation of wobble and nutation on the rigid earth rotation, the dynamical equations of polar migration and nutation of CIP axis of rigid earth are given. Taking account of precession-nutation moment of 5 orders, the expressions of precession-nutation of CIP axis is presented. Theoretical deduction shows that precession-nutation moment induced by odd order tidal generating potential causes out of phases of longitude and obliquity nutation(namely, there are cos term in longitude nutation, but sin term in obliquity nutation).