Localization of sperm whales in a group using clicks received at two separated short baseline arrays

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

    Research output: Contribution to journalArticle

    18 Citations (Scopus)

    Abstract

    In this paper, a sperm whale click analysis scheme is proposed in order to calculate the position of individual sperm whales in a group using data received at two arrays deployed near the surface. The proposed method mainly consists of two parts: short baseline (SBL) with classification and long baseline (LBL) with class matching. In SBL with classification, a click is automatically detected, and its direction of arrival is calculated. The clicks are then classified based on their direction vectors. The class data are then sent together with direction data and matched to the other array's class data. LBL with class matching is used for localization. The classification algorithm can be used to estimate the number of whales clicking and to list potential candidates for LBL matching. As a result, the proposed method is able to localize the positions of the whales in a group. The performance of the proposed method is evaluated using data recorded off Ogasawara islands with two arrays near the surface. The three-dimensional underwater trajectories of six sperm whales are extracted to demonstrate the capability of the proposed method.

    Original languageEnglish
    Pages (from-to)133-147
    Number of pages15
    JournalJournal of the Acoustical Society of America
    Volume127
    Issue number1
    DOIs
    Publication statusPublished - 2010

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    whales
    underwater trajectories
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    Localization
    estimates

    ASJC Scopus subject areas

    • Acoustics and Ultrasonics

    Cite this

    Localization of sperm whales in a group using clicks received at two separated short baseline arrays. / Hirotsu, Ryo; Yanagisawa, Masao; Ura, Tamaki; Sakata, Masao; Sugimatsu, Harumi; Kojima, Junichi; Bahl, Rajendar.

    In: Journal of the Acoustical Society of America, Vol. 127, No. 1, 2010, p. 133-147.

    Research output: Contribution to journalArticle

    Hirotsu, Ryo ; Yanagisawa, Masao ; Ura, Tamaki ; Sakata, Masao ; Sugimatsu, Harumi ; Kojima, Junichi ; Bahl, Rajendar. / Localization of sperm whales in a group using clicks received at two separated short baseline arrays. In: Journal of the Acoustical Society of America. 2010 ; Vol. 127, No. 1. pp. 133-147.
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    AU - Kojima, Junichi

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