Abstract
While time-series analysis and modeling has always been the approach used by geophysicists for studying low-frequency seismic wave propagation in the Earth’s crust, underwater acousticians have traditionally favored spectral analysis techniques, which only provide information about the band-averaged energy distribution in space. There are several reasons for choosing this approach in ocean acoustics. Most importantly, the ocean is characterized by high temporal variability, which causes strong (and unpredictable) signal fluctuations for long-range propagation at traditional sonar frequencies. At best, only the mean signal energy seems to have a predictable behavior at these frequencies. However, for some years now, the trend in sonar development has been toward lower frequencies, which should lead to both higher signal stability and better predictability. Consequently, the powerful time-series analysis techniques of geophysics may well become a valuable tool also for studying the complex propagation situations encountered in the ocean.
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Jensen, F.B., Kuperman, W.A., Porter, M.B., Schmidt, H. (2011). Broadband Modeling. In: Computational Ocean Acoustics. Modern Acoustics and Signal Processing. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-8678-8_8
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DOI: https://doi.org/10.1007/978-1-4419-8678-8_8
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