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Cross-Spectral Analysis of Midfrequency Acoustic Waves Reflected by the Seafloor

Article dans une revue avec comité de lecture
Author
GUILLON, Laurent
13094 Institut de Recherche de l'Ecole Navale [IRENAV]
HOLLAND, Charles
BARBER, Christopher

URI
http://hdl.handle.net/10985/8768
DOI
10.1109/JOE.2011.2114111
Date
2011
Journal
IEEE Journal of Oceanic Engineering

Abstract

Direct path measurements of a single-bottom interacting path on a vertical array are used to probe the seabed structure. The phase of the cross-spectrum, commonly used in engineering acoustics, permits examination of the importance of subbottom paths. When the cross-spectral phase is linear with frequency it implies that source to receiver propagation is dominated by a single path. A linear cross-spectral phase would also satisfy the linear seabed reflection coefficient phase approximation sometimes employed in forward modeling and geoacoustic inversion approaches. Shallow water measurements of the cross-spectrum, however, evidence a strongly nonlinear phase, below about 1500 Hz at one site, and 600 Hz at another site, implying that: 1) the subbottom structure plays an important role (i.e., a seabed half-space approximation would be inappropriate); and 2) the linear reflection phase approximation would be violated at those frequencies

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