Classification of sperm whale clicks and triangulation for real-time localization with SBL arrays

Ryo Hirotsu, Tamaki Ura, Junichi Kojima, Harumi Sugimatsu, Rajendar Bahl, Masao Yanagisawa

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    2 Citations (Scopus)

    Abstract

    In order to observe the underwater behavior of sperm whales, the authors previously introduced a passive acoustic system that consists of an AUV (Autonomou Underwater Vehicle) with a hydrophone array and two arrays attached to a support ship. The three arrays receive sperm whale clicks and determine the direction to the sound source by a SBL (Short Baseline) system. Based on triangulation with a pair of arrays, it is possible to calculate the location of the sound source in real-time. Sperm whales usually dive in groups, and so each array captures thousands of clicks from multiple whales. It is, therefore, necessary to identify the corresponding clicks of each individual captured by the three arrays. However, the acoustic communication band between the AUV and the support ship is limited, so it is impossible to correlate the clicks received by each array in real-time. In order to triangulate with a limited communication band, the authors introduce a click classification scheme at each array considering the individual sound source. The class data is sent together with direction data to the AUV and an array on the support ship. Thus the AUV and the operator in the support ship can estimate the posisiton of the whale by a LBL (Long Baseline) system. In this paper, the proposed classification algorithm is applied to data recorded off Ogasawara in 2003[6]. The clicks can be classified reasonably by the proposed method. The three-dimensional underwater trajectories of six sperm whales are obtained by using the classes obtained by the proposed method.

    Original languageEnglish
    Title of host publicationOCEANS 2008
    DOIs
    Publication statusPublished - 2008
    EventOCEANS 2008 - Quebec City, QC
    Duration: 2008 Sep 152008 Sep 18

    Other

    OtherOCEANS 2008
    CityQuebec City, QC
    Period08/9/1508/9/18

    Fingerprint

    triangulation
    Triangulation
    whale
    sperm
    Ships
    support vessel
    underwater vehicle
    Acoustic waves
    Acoustics
    Hydrophones
    Communication
    Trajectories
    acoustics
    communication
    hydrophone
    trajectory

    ASJC Scopus subject areas

    • Computer Networks and Communications
    • Computer Vision and Pattern Recognition
    • Oceanography

    Cite this

    Classification of sperm whale clicks and triangulation for real-time localization with SBL arrays. / Hirotsu, Ryo; Ura, Tamaki; Kojima, Junichi; Sugimatsu, Harumi; Bahl, Rajendar; Yanagisawa, Masao.

    OCEANS 2008. 2008. 5151882.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Hirotsu, R, Ura, T, Kojima, J, Sugimatsu, H, Bahl, R & Yanagisawa, M 2008, Classification of sperm whale clicks and triangulation for real-time localization with SBL arrays. in OCEANS 2008., 5151882, OCEANS 2008, Quebec City, QC, 08/9/15. https://doi.org/10.1109/OCEANS.2008.5151882
    Hirotsu, Ryo ; Ura, Tamaki ; Kojima, Junichi ; Sugimatsu, Harumi ; Bahl, Rajendar ; Yanagisawa, Masao. / Classification of sperm whale clicks and triangulation for real-time localization with SBL arrays. OCEANS 2008. 2008.
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