Automated approach for recovering modal components in shallow waters

Angèle Niclas; Josselin Garnier

doi:10.1121/10.0025471

Automated approach for recovering modal components in shallow waters

J Acoust Soc Am. 2024 Apr 1;155(4):2347-2358. doi: 10.1121/10.0025471.

Authors

Angèle Niclas¹, Josselin Garnier²

Affiliations

¹ Mathématiques Appliquées à Paris 5, Centre National de la Recherche Scientifique, Université Paris Cité, Paris, 75006, France.
² Centre de mathématiques appliquées de l'Ècole Polytechnique, Centre National de la Recherche Scientifique, Ècole Polytechnique, Institut Polytechnique de Paris, Palaiseau, 91120, France.

PMID: 38557739
DOI: 10.1121/10.0025471

Abstract

This paper proposes a fully automated method for recovering modal components from a signal in shallow waters. The scenario involves an unknown source emitting low-frequency sound waves in a shallow water environment, and a single hydrophone recording the signal. The proposed automated algorithm is based on the warping method to separate each modal component in the time-frequency space. However, instead of manually choosing a single arrival time for extraction, the method performs successive extractions with automated time selection based on an explicit quality factor. Modal component separation is achieved through a watershed algorithm, streamlining the process and eliminating the need for manual intervention. The proposed method is tested on experimental data of a right whale gunshot, a combustive sound source, and a bowhead whale upsweep, demonstrating its effectiveness in real-world scenarios.