Tomographic inversion of measured cross-correlation functions of ocean noise in shallow water using ray theory

Based on experimental data obtained in 2012 in the Florida Strait, we study the feasibility of employing ray tomography to retrieve sound speed and flow velocity profiles from measured noise cross-correlation functions. We describe the results of numerical experiments that characterize the inversion...

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Bibliographic Details
Published in:Acoustical physics 2016-07, Vol.62 (4), p.436-446
Main Authors: Goncharov, V. V., Shurup, A. S., Godin, O. A., Zabotin, N. A., Vedenev, A. I., Sergeev, S. N., Brown, M. G., Shatravin, A. V.
Format: Article
Language:English
Subjects:
Acoustics
Inversions
Mathematical analysis
Mathematical models
Noise
Ocean Acoustics. Hydroacoustics
Physics
Physics and Astronomy
Shallow water
Sound
Straits
Tomography
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Summary:Based on experimental data obtained in 2012 in the Florida Strait, we study the feasibility of employing ray tomography to retrieve sound speed and flow velocity profiles from measured noise cross-correlation functions. We describe the results of numerical experiments that characterize the inversion errors resulting from peculiarities of the ray structure in shallow water, difficulties in unambiguous identification of ray arrivals, and a decrease in accuracy of ray theory at low frequencies. We show that under conditions of low-mode sound propagation, the use of the classical ray tomography scheme can yield only a rough estimate of the sound speed profile, but it allows approximate reconstruction of the current velocity profile. Application of passive ray tomography to the experimental data yields the current velocity profile in the Straits of Florida, which agrees with independent measurements within the inversion error limit.
ISSN:1063-7710
1562-6865
DOI:10.1134/S1063771016040072