Understanding deep-water striation patterns and predicting the waveguide invariant as a distribution depending on range and depth

dc.contributor.author Emmetiere, Remi
dc.contributor.author Bonnel, Julien
dc.contributor.author Gehant, Marie
dc.contributor.author Cristol, Xavier
dc.contributor.author Chonavel, Thierry
dc.date.accessioned 2018-08-08T13:38:49Z
dc.date.available 2018-08-08T13:38:49Z
dc.date.issued 2018-06-08
dc.description Author Posting. © Acoustical Society of America, 2018. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 143 (2018): 3444, doi:10.1121/1.5040982. en_US
dc.description.abstract The Waveguide Invariant (WI) theory has been introduced to quantify the orientation of the intensity interference patterns in a range-frequency domain. When the sound speed is constant over the water column, the WI is a scalar with the canonical value of 1. But, when considering shallow waters with a stratified sound speed profile, the WI ceases to be constant and is more appropriately described by a distribution, which is mainly sensitive to source/receiver depths. Such configurations have been widely investigated, with practical applications including passive source localization. However, in deep waters, the interference pattern is much more complex and variable. In fact the observed WI varies with source/receiver depth but it also varies very quickly with source-array range. In this paper, the authors investigate two phenomena responsible for this variability, namely the dominance of the acoustic field by groups of modes and the frequency dependence of the eigenmodes. Using a ray-mode approach, these two features are integrated in a WI distribution derivation. Their importance in deep-water is validated by testing the calculated WI distribution against a reference distribution directly measured on synthetic data. The proposed WI derivation provides a thorough way to predict and understand the striation patterns in deep-water context. en_US
dc.description.sponsorship This work was funded by Delegation General de l’Armement and by Thales Underwater Systems. We warmly acknowledge D. Fattaccioli (DGA) for his scientific support. J.B.’s contribution was supported by ENSTA Bretagne (France) and by the Investment in Science Fund at WHOI (USA). en_US
dc.identifier.citation Journal of the Acoustical Society of America 143 (2018): 3444 en_US
dc.identifier.doi 10.1121/1.5040982
dc.identifier.uri https://hdl.handle.net/1912/10516
dc.language.iso en_US en_US
dc.publisher Acoustical Society of America en_US
dc.relation.uri https://doi.org/10.1121/1.5040982
dc.title Understanding deep-water striation patterns and predicting the waveguide invariant as a distribution depending on range and depth en_US
dc.type Article en_US
dspace.entity.type Publication
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