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Inversion géoacoustique passive pour l'évaluation rapide de l'environnement : utilisation de sources d'opportunité

Abstract : The geoacoustic inversion aims at giving an estimate of the oceanographic properties impacting the acoustic propagation. Most of the current geoacoustic inversion methods are active methods. However, the environment protection policy as well as military necessity of discretion is leading the community into working on less invasive and more discrete inversion schemes. The main idea of passive geoacoustic inversion is to take advantage of opportunity sources by listening to the effect of the environmental properties on their propagation. This PhD work focuses on the development and the validation of a new passive geoacoustic inversion scheme relying on marine mammals frequency modulations recorded on a single hydrophone in shallow waters. This mono-receiver method uses the multipath propagation. The processing of a set of calls provide an estimate of the reflexion coefficient regarding the grazing angle. High resolution separation tools based on bespoke time warping operators have been developed to improve the range of the method in case of not reported multipaths. When the paths remains unresolved (thus unidentified), others tools have been implemented that allows to locate the source with groups of unidentified paths. This localisation can be reached in 3D using only one receiver in varied bathymetry. We analyse the directivity for the high-frequency signals we planed to use and demonstrate how to take into account the directivity as soon as the source directivity pattern is available.
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Amelie Barazzutti. Inversion géoacoustique passive pour l'évaluation rapide de l'environnement : utilisation de sources d'opportunité. Traitement du signal et de l'image [eess.SP]. Université Grenoble Alpes, 2016. Français. ⟨NNT : 2016GREAU052⟩. ⟨tel-01456761v3⟩

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