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随机激发过程对地极移动的作用
引用本文:王梓坤.随机激发过程对地极移动的作用[J].地球物理学报,1978,21(3):225-233.
作者姓名:王梓坤
作者单位:南开大学数学系
摘    要:以随机微分方程组(1)作为地极移动(钱德勒摆动)的数学模型,求出了(1)的解。此解是二维的正态、平稳、马尔科夫随机过程,它具有遍历性.找到了它的转移概率密度和相关函数.通过对相关函数的研究,如果取ω=5.274,则钱德勘周期重合于强相关周期2π/ω;此外,还发现了另一个周期,即独立性周期π/ω.最后,研究了地极移动模型的最佳预测公式和预测误差.

关 键 词:地极移动  随机激发  长期极移  钱德勒摆动  分量  最佳预测  二维正态分布  观察资料  钱德勒周期  向量  
收稿时间:1977-07-19

ON THE RANDOM EXCITING PROCESS FOR POLAR MOTION
WANG ZI-KUN.ON THE RANDOM EXCITING PROCESS FOR POLAR MOTION[J].Chinese Journal of Geophysics,1978,21(3):225-233.
Authors:WANG ZI-KUN
Institution:Department of mathematics, Nankai University
Abstract:The chandler motion of the earth is modeled by a system of differential equations (1), where Xt = (ξt,ηt) are the polar coordinates. It is shown that X, is a 2-dimen-sional normal markou stationary ergodic random process. The trarsition probabilistic density and covariance matrix of Xt are calculated. We find two periods of Xt, the strong correlation period 2π/ω and the independent periodπ/ω; the former is equal to chandler period if We take a = 5.274, then In/a = 1.2 years. The best prediction formular for Xt and the prediction error are given by (31), (34) respectively.
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