Depth and range of sound sources can be estimated using a single hydrophone. Such a passive acoustic technique requires the detection of direct path transmitted, sea surface, and seafloor reflected source signals, so as to measure their time of arrival differences (TOADs). Sperm whales almost continuously emit powerful, directional echolocation sounds (usual clicks) when diving. Sperm whales often dive in deep water, and click seafloor reflections are usually well detected only at the beginning of the dive. Surface echoes may be detected during the entire dive. If the measurement of the surface reflection TOAD of a single click is not enough for estimating the depth/range of the sperm whale at the time when this click was emitted, the joint consideration of delays emitted during the whole dive may provide this estimation. Such delays are indeed the measurements of a single phenomenon: the underwater movements of a single‐clicking sperm whale. One can merge such data using a Bayesian technique, as well as use prior information (e.g., range when fluking‐up). Such a method could make the single‐hydrophone localization technique usable regardless of the properties of the sea bottom, e.g., in deep or high relief areas.
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May 2006
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May 04 2006
Depth/range localization of diving sperm whales using passive acoustics on a single hydrophone disregarding seafloor reflections
Christophe Laplanche;
Christophe Laplanche
Université Paris 12, 61 av. du Gal de Gaulle, 94000 Créteil, France
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Olivier Adam;
Olivier Adam
Université Paris 12, 61 av. du Gal de Gaulle, 94000 Créteil, France
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Maciej Lopatka;
Maciej Lopatka
Université Paris 12, 61 av. du Gal de Gaulle, 94000 Créteil, France
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Jean‐François Motsch
Jean‐François Motsch
Université Paris 12, 61 av. du Gal de Gaulle, 94000 Créteil, France
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J. Acoust. Soc. Am. 119, 3403–3404 (2006)
Citation
Christophe Laplanche, Olivier Adam, Maciej Lopatka, Jean‐François Motsch; Depth/range localization of diving sperm whales using passive acoustics on a single hydrophone disregarding seafloor reflections. J. Acoust. Soc. Am. 1 May 2006; 119 (5_Supplement): 3403–3404. https://doi.org/10.1121/1.4808926
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