Time-frequency analysis techniques for long range sediment tomography
Gopu R. Potty and James H. Miller

         Long range sediment tomography technique uses travel-time of acoustic normal modes at different frequencies to invert for the geoacoustic properties. The modal travel-times are calculated from the time-frequency analysis of the acoustic time series. Travel times in the frequency range 1 Hz to less than 1 kHz modes 1-6 obtained using broadband sources are typically used as data for the inversion. Various time-frequency analysis techniques used in the past in the context of long range sediment tomography will be presented. These techniques include short time Fourier transform, wavelet transform, matching pursuit algorithms, and dispersion based short time Fourier transforms. Performance of these techniques will be compared using data from various types of broadband sources deployed during different field experiments.

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