地球自转速率变化主要中短周期的分析  

Analysis of Main Middle and Short Periods in the Variation of the Earth's Rotation

作　　者：韩永刚[1] 李志安[2] 

机构地区：[1]北京工业大学应用数学系,北京100022 [2]中国科学院国家天文台

出　　处：《地球物理学进展》2002年第2期349-352,共4页Progress in Geophysics

基　　金：国家自然科学基金 (199730 11)

摘　　要：利用新的世界时高精度观测资料序列分析讨论了地球自转速率的变化特征 ,采用最大熵谱分析的方法得到这一运动中主要中短周期的参数 ,而利用小波分析的方法发现某些周期具有明显的时变特征 。In this paper, the authors use the new data series of lod with high precision to analyze the characters of the variation of the Earth's rotation. The parameters of the main middle and short periods of the movement are obtained by the Maximum Entropy Method (MEM or AR spectrum estimate). An obvious character in the variation of the Earth's rotation is found by the wavelet analysis method. That is the values of some periods and their amplitudes are change with the time. The deep study of the phenomenon will be significant.

关 键 词：地球自转变化 LOD 谱分析 小波变换 

分 类 号：P183[天文地球—天文学]