液核地球极移和章动理论模型的改进  

A Theoretical Improvement on Wobble and Nutation of Fluid Core Earth Model

作　　者：张捍卫[1] 许厚泽[2] 周旭华[2] 

机构地区：[1]徐州师范大学国土信息与测绘工程系,江苏徐州221116 [2]中国科学院测量与地球物理研究所,湖北武汉430077

出　　处：《测绘学报》2006年第3期215-219,共5页Acta Geodaetica et Cartographica Sinica

基　　金：云南省自然科学基金(2005A0010R);国家自然科学基金(40374030;40234039)

摘　　要：以经典的液核弹性地球自转动力学理论为基础,通过引入章动坐标系相对惯性空间的运动,建立液核地球极移和章动的联合动力学方程。由此定义液核地球的CIP轴,并对其进行解算。研究表明新方法克服了传统方法不能解决的一些问题(例如CEP和CIP的定义),简化了传统方法求解的复杂性。值得注意的是新方法可同时求解极移和章动,特别是在Smith M.L.(1977)理论中出现的倾斜模(TOM),在此只是作为一个特解而存在。Based on classical dynamical equation on rotation of fluid core Earth, a associated dynamical equation containing both nutation and wobble of Earth rotation have been deduced through introducing motion of nutation frame system with respect to inertial spatial frame. Therefore, we have defined CIP axis of fluid core Earth and resolved it. It indicated that the new method overcame some problem which can＇t be solved by traditional method, and predigested complexity in traditional process. It is remarkable that wobble and nutation can be solved synchronously. In particular, theoretically TOM in theory of Smith M. L. （1977） only is a special solution of new dynamical equation.

关 键 词：章动坐标系 极移和章动 联合动力学方程 

分 类 号：P223[天文地球—大地测量学与测量工程]