标准Morlet小波变换检测地球自由振荡  

Normal Morlet Wavelet Transform and Its Application to Detection of the Earth's Free Oscillations

作　　者：徐华君[1] 柳林涛[2] 罗孝文[3] 

机构地区：[1]苏州科技学院环境科学与工程学院,江苏苏州215011 [2]中国科学院测量与地球物理研究所,湖北武汉430077 [3]国家海洋局第二海洋研究所,浙江杭州310012

出　　处：《测绘学报》2009年第1期16-21,共6页Acta Geodaetica et Cartographica Sinica

基　　金：国家自然科学基金(40574009)

摘　　要：引入标准Morlet小波变换(NMWT),并将其作为调和分析的工具应用于实际的数据处理中。NMWT不需要逆变换就能直接识别并提取出信号的周期项。在不经过潮汐及气压改正的情况下,对超导重力仪观测的重力变化序列进行NMWT,有效地检测并提取出振幅为1nms-2的最基本的径向球形振荡(0S0)信号,从而将传统的在频域计算Q值的方法转换为简单的时域计算。结果表明标准Morlet小波变换是一个分析自由振荡信号的理想工具。The Normal Morlet Wavelet Transform （NMWT）, which is a mathematical method for harmonic analysis, is introduced in this study. The NMWT can recognize and extract the harmonic components of the signal directly, without an inverse transform. It is applied to detect the earth＇s free oscillations by NMWT analysis of the observed gravity variations from superconducting, it can recognize and extract the 0S0 , which amplitude is only 0.1μGal （1 Gal=0.01 m/s^2）, and it can also simplify the colculotion of q. Result indicates that NMWT is an ideal tool to analyze the earth＇s ftee oscillations.

关 键 词：标准Morlet小波变换 调和分析 自由振荡 Q值 

分 类 号：P223[天文地球—大地测量学与测量工程]