摘要
给出一种新的非线性、非平稳信号的处理方法——HHT方法,并把该方法首次应用于星载电场数据处理中.以2004年9月15日菲律宾6.0级地震前两天(13日)DEMETER卫星经过震中区域上空所记录到的数据为例,对ULF频段的电场数据进行了处理,得到了相应的HHT时频图谱.另外,还利用DEMETER卫星中心网站提供的SWAN软件计算得到了相应的小波变换时频图谱,通过比较发现,虽然两种方法对异常信号出现的位置时刻的描述有相同的能力,但HHT方法在异常信号的细节描述上更为清晰,从而为今后进一步的研究工作奠定了基础.
In this paper, a new method HHT is invented to deal with non-linear and non-stationary data is introduced. It is used to processing the electric field data（ULF band） recorded by satellite. The electric field data observed by DEMETER satellite two days before Philippine M6. 0 earthquake has been processing. HHT time- frequency spectrums are obtained. In addition, Wavelet transform time-frequency spectrum are obtained by using the SWAN software, which provided by the network of DEMETER satellite center. Compared the two spectrums , the two methods have the same ability in describing the position of abnormal signal appeared, but the method of HHT can describe with clarity the abnormal signal than the wavelet transform. All these study in this paper will establish a good groundwork for the farther work.
出处
《地球物理学进展》
CSCD
北大核心
2012年第1期83-91,共9页
Progress in Geophysics
基金
中国地震局地震预测研究所基本科研业务专项(A88-3)
国家科技支撑计划(2008BAC35B01-8)联合资助
关键词
DEMETER卫星
电场数据处理
HHT方法
本征模态分解
本征模态函数
DEMETER satellite, electric field data processing, Hilbert-Huang Transform, empirical mode decomposition, intrinsic mode function
