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基于时—频分解技术的全波列声波测井信号处理
引用本文:林盛,刘业新,李衍达.基于时—频分解技术的全波列声波测井信号处理[J].清华大学学报(自然科学版),1997(3).
作者姓名:林盛  刘业新  李衍达
作者单位:清华大学自动化系,智能技术与系统国家重点实验室
摘    要:声波测井信号通常包含几种不同模式的波,它们是由加窗的窄带信号产生且具有不同的主频,因此在时—频面中是可分的。根据这些波的不同特点,提出了基于时—频分解技术的各模式波的分离方法,把测井信号分解为一系列基本函数的线性组合,且它们在时—频平面上有良好的局部特性。根据时—频平面上的信号能量分布,可以得到各模式波的一种可能的分解,由此可进一步计算纵、横波时差,推断地下岩石特性。同时,各模式波也以解析的方式给出,有利于进一步的理论研究

关 键 词:时频分析  “原子”分解  声波测井数据处理

Full waveform sonic data processing using time frequency decomposition
Lin Sheng,Liu Yexin,Li Yanda.Full waveform sonic data processing using time frequency decomposition[J].Journal of Tsinghua University(Science and Technology),1997(3).
Authors:Lin Sheng  Liu Yexin  Li Yanda
Institution:Lin Sheng,Liu Yexin,Li Yanda Department of Automation,Tsinghua University, State Key Laboratory of Intelligent Technology and Systems,Beijing 100084
Abstract:A time frequency decomposition method is applied to process full waveform sonic records containing multiple wave modes. These wave modes are generated by windowed narrow band signals and have different main frequency . Therefore, there are separable in T F (Time Frequency) plane. Then matching pursuits, which are general procedures to compute adaptive signal representations , are introduced to perform a time frequency decomposition of the waveform. Examples show that the method can approximate original signal perfectly with a linear combination of a few components in the time frequency dictionary, and different wave modes are well concentrated in T F plane. Consequently, a more possible decomposition of waveform into different wave modes can be performed according to the energy distribution in T F plane.
Keywords:time frequency analysis  "atomic"  decomposition  sonic data processing  
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