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Reverberation due to a moving, narrowband source in an ocean waveguide

TitleReverberation due to a moving, narrowband source in an ocean waveguide
Publication TypeJournal Article
Year of Publication2019
AuthorsHefner B.T, Hodgkiss WS
Date Published2019/09
Type of ArticleArticle
ISBN Number0001-4966
Accession NumberWOS:000489159400032
Keywordsacoustics; Audiology & Speech-Language Pathology; normal-mode reverberation; scattering; shallow-water; target

In this paper, a model for the bistatic reverberation associated with seafloor scattering of sound from a moving, narrowband source in an ocean waveguide is developed. Studies of the Doppler effect for moving sources in waveguides have typically focused on the forward propagating field where the Doppler shift leads to a splitting or broadening of the received spectrum. In contrast, the contributions to the scattered field come from all directions and as a consequence the spectrum of the received energy is spread across the entire range of Doppler-shifted frequencies possible for the speed of the source. The model developed here uses rays for the incident field, ray-mode analogies for the scattering, and normal modes to propagate the scattered field to the receiver. Results from this model are compared with data collected using a towed source during the Target and Reverberation Experiment 2013. The possible applications of this Doppler reverberation for seafloor characterization are also considered.

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