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- W564275508 abstract "In wave propagation, the phenomenon of dispersion, whereby different frequencies travel at different velocities, can result in significant nonstationarities, i.e., time- and spatially-varying characteristics of the wave. This effect is particularly strong in shallow water sound propagation, due to the waveguide-like action of the ocean bottom and surface.These channel-induced nonstationarities can have a deleterious impact on automatic detection and classification in the absence of signal processing techniques that account for dispersive channel effects.We quantify the effects of dispersion on the spatial and temporal spreading of a propagating wave by considering local temporal, spatial and spectral moments of the modes of the wave. By local moments we mean, for example, the spread (standard deviation) of the wave in time at a particular location; or the average frequency of the wave at a particular time. We implement simple dispersion-based waveguide models of a shallow ocean channel and demonstrate by application to impulsive-source sonar data thatsimple channel models requiring little environmental information can be used to compensate for the effects of dispersion." @default.
- W564275508 created "2016-06-24" @default.
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- W564275508 date "2004-06-09" @default.
- W564275508 modified "2023-09-27" @default.
- W564275508 title "Implementation and Application of dispersion-based waveguide models for shallow-water sonar processing" @default.
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