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Theses

Tomographie acoustique haute résolution dans un guide d'onde océanique

Abstract : This thesis deals with Ocean Acoustic Tomography by propagation time to estimate the water temperature from acoustic measurements. As propagation time is strongly related to temperature, we solve the following inverse problem: estimating the wave velocity using measurements of acoustic wave propagation time. In this thesis, we focus on acquisitions with two coplanar source-receive arrays, placed in a shallow water waveguide. In these waveguides, time propagation measurements and identification task is difficult to achieve due to multipath propagation. Using two antennas, we propose a Double Beamforming algorithm to separate the contributions of different paths, depending on their emission and reception angles. This method leads to more accurate time propagation measurements and facilitate the identification task. Additionally to measurements of propagation time, tomography needs a physical model linking the propagation time to the velocity. Two models have been analyzed: the classical Ray theory, and the Time Sensitivity Kernel (TSK) obtained under the Born approximation. A TSK adaptation to the measurements obtained by double beamforming was performed. The developed methods were validated on synthetic data and on small scale data where guide propagation is produced in an ultrasonic tank. Using these data, we also studied some physical phenomena: convection and surface waves.
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https://tel.archives-ouvertes.fr/tel-00521540
Contributor : Ion Iturbe <>
Submitted on : Monday, September 27, 2010 - 10:01:43 PM
Last modification on : Thursday, November 19, 2020 - 3:54:27 PM
Long-term archiving on: : Thursday, October 25, 2012 - 4:05:21 PM

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  • HAL Id : tel-00521540, version 1

Citation

Ion Iturbe. Tomographie acoustique haute résolution dans un guide d'onde océanique. Traitement du signal et de l'image [eess.SP]. Institut National Polytechnique de Grenoble - INPG, 2010. Français. ⟨tel-00521540⟩

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