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- W2069078934 abstract "A sensitive processing method to remove the random components of seismic signals and examine their similarity in the time-frequency domain is presented. We transform signals to the time-frequency (T-F) domain using parametric and nonparametric algorithms. The first method estimates an autoregressive process (AR) and its spectral density in a short moving window, the second computes the instantaneous frequency of the signal at each moment of time. The main problems are the trade-off between the time and the frequency domain which limits the resolution of the method and cross terms of the T-F distribution which may lead to misinterpretation of the different modes of the signal. Next we present some limitation on the resolution of some popular T-F distributions and suggest an improved method based on a time-frequency coherency function. We conclude that coherency analysis in the T-F domain makes it possible to investigate precisely the repeatability of seismic sources, to control the stacking efficiency and also to estimate the onset of the same modes (for example P and S components, tube waves)." @default.
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- W2069078934 date "1996-09-01" @default.
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- W2069078934 title "Resolution of time-frequency analysis for seismic crosshole measurements" @default.
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- W2069078934 doi "https://doi.org/10.1016/0926-9851(96)00012-2" @default.
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