小波包在可控震源地震信号时延估计中的应用
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摘要
在可控震源地震勘探信号处理中,利用发射信号和反射信号之间的时频分布相似性,提出了用小波包变换时频分布的二维相关算法,估计接收信号中各个反射信号分量的时间延迟。该方法能从信噪比为-4dB的接收信号中准确地对反射信号进行检测和时延估计。
In the signal processing of vibroseis exploration, utilizing the compa rability between the time-frequency distributions of sent signal and reflected s ignals, wavelet-packet time-frequency distribution's two-dimensional c orr elation arithmetic is used to estimate the time delays of the reflected signals in the r eceived signal. The experiment of simulation shows that this arithmetic can dete ct the reflected signals successfully from a -4 dB received signal and estimate the time delays accurately.
In the signal processing of vibroseis exploration, utilizing the compa rability between the time-frequency distributions of sent signal and reflected s ignals, wavelet-packet time-frequency distribution's two-dimensional c orr elation arithmetic is used to estimate the time delays of the reflected signals in the r eceived signal. The experiment of simulation shows that this arithmetic can dete ct the reflected signals successfully from a -4 dB received signal and estimate the time delays accurately.
引文
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[2]彭玉华(PENGYu-hua).小波包与工程应用(Wavelettransformandprojectapplication)[M].北京:科学出版社(Beijing:SciencePress),2002.
[3]秦前清,杨宗凯(QINQian-qing,YANGZhong-kai).实用小波分析(Practicalwaveletanalysis)[M].西安:西安电子科技大学出版社(Xi'an:Xi'anElectricalScienceandTechnologyUniversityPress),1994.
[4]杨福生(YANGFu-sheng).小波变换的工程分析与应用(Projectanalysisandapplicationofwavelettransform)[M].北京:清华大学出版社(Beijing:TsinghuaUniversityPress),1996.
[5]ChenVC.SignalDetectionandEstimationbyWaveletTransform[A].ProceedingsoftheThirdInternationalAnnualSymposiumonRadar[C].Beijing:[s.n],1991.
[6]DaubechiesI.TheWaveletTransform:Time-FrequencyLocalizationandSignalAnalysis[J].IEEETransOnInformationTheory,1990,36(5).
[7]KadambeS,etal.ApplicationsoftheWaveletTransforminPitchDetectionofSpeechSignals[J].IEEETransOnInformationTheory,1992,38(2).
[8]FrischM,MesserH.TheUseofWaveletTransformintheDetectionofUnknownTransientSignal[J].IEEETrans801OnInformationTheory,1992,38(2).
[9]PengYH,WangWB.TheApplicationofWaveletTransforminElectromagneticObjectDetection[A].ProceedingoftheThirdInternationalSymposiumonAntennasandEMTheory[C].Beijing:[s.n],1993.
[10]RioulO.ADiscreteTimeMultiresolutionTheory[J].IEEETransOnSP,1993,41(8).
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