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The Research of Time-Frequency Analysis Method Based on Hilbert-Huang Transfrom

Author: ZhaoCuiXia
Tutor: SongJianGuo
School: China University of Petroleum
Course: Earth Exploration and Information Technology
Keywords: Seismic signals Time-frequency analysis Hilbert-Huang Transform Empirical Mode Decomposition
CLC: P631.4
Type: Master's thesis
Year: 2011
Downloads: 252
Quote: 2
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Abstract


The main object of study of non - stationary signals time-frequency analysis method , this method is able to describe the characteristics of the signal spectrum statistics change over time . Modern emerged a lot of time-frequency analysis methods , such as short-time Fourier transform, wavelet transform , have played a role, but there is still time resolution and frequency resolution of mutual restraint , frequency resolution reach the desired effect shortcomings. In this paper , the existing time -frequency resolution of problem analysis techniques exist to study the new time-frequency analysis method , combined with the characteristics of the seismic data , the development of the Hilbert-Huang transform (HHT) - based high-resolution time- frequency analysis method to obtain a suitable for seismic signal decomposition empirical mode decomposition method . HHT mainly consists of two parts : the empirical mode decomposition (EMD) and Hilbert spectrum analysis . Hilbert spectrum of a finite number of intrinsic mode functions (IMF), and then for the corresponding component of the Hilbert transform of each IMF component , any non-stationary signals after EMD decomposition finally consolidated all the components of the Hilbert spectrum of the original signal Hilbert spectrum . This paper focuses on HHT transform method , its methods and frequency analysis based on HHT transform when research in seismic data processing . Method itself suitable for seismic signal decomposition EMD decomposition algorithm , base shock wave characteristics of the endpoint processing algorithm design , endpoints based on the data trend near the end of the spline interpolation , effectively inhibit the end effect . In applied research , based HHT time frequency analysis technology to extract seismic data attributes ; logging data the cycle analysis Jingpang seismic data HHT cycle analysis for comparison , verify the HHT validity in the identification of sedimentary cycles ; improve contrast resolution seismic data before and after the HHT transform , can see the differences in the frequency of seismic data before and after the improvement of the resolution , therefore , HHT transform can be used to identify the resolving power of the seismic data ; addition , based on the characteristics of the seismic data HHT transform explore seismic data denoising with the possibility of high-resolution processing , according to the characteristics of the surface wave in the EMD decomposition design surface wave cancellation algorithm to achieve better results .

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CLC: > Astronomy,Earth Sciences > Geology > Geology, mineral prospecting and exploration > Geophysical exploration > Seismic exploration
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