Acoustic tracking of sperm whales using two sets of hydrophone array

Tamaki Ura, Rajendar Bahl, Masao Sakata, Jun'ichi Kojima, Tetsuo Fukuchi, Jun'ya Ura, Yoshiaki Nose, Harumi Sugimatsu, Kyoichi Mori, Takeshi Nakatani, Masao Yanagisawa

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

    6 Citations (Scopus)

    Abstract

    Sperm whales are known to dive to a depth of over two thousand meters and it is also known that they emit loud impulsive broadband sounds called "clicks" during their diving. But little is known about sperm whales' behavior because of a shortage of methods to observe them during their dives. Our attempt is to use autonomous the underwater vehicle (AUV) as an observation platform for sperm whales. The tasks of AUV are to recognize sperm whales individually and track them in real time by listening to sperm whale's clicks with 4-hydrophone array and detecting its direction. As the initial stage for these objectives, we set up an experiment for our observation system using a boat instead of AUV and a support boat. In the middle of August 2003, we carried out an experiment to test our observation system off Ogasawara Islands. Two boats each with a hydrophone array were deployed mainly in the west or southeast of Chichijima Island in ocean depth of about 1000 meters. During the experiments over five days we encountered at least fourteen sperm whales. The result of this experiment indicates our observation system is suitable for tracking of sperm whales in sub-real time. We also acquired sufficient sound data of sperm whale's vocalization for off-line verification. The analysis of the results is presently underway. This experiment can be considered as the preliminary step to apply this kind of technique to develop innovative observation for underwater ecosystem system using AUVs.

    Original languageEnglish
    Title of host publication2004 International Symposium on Underwater Technology, UT'04 - Proceedings
    Pages103-107
    Number of pages5
    Publication statusPublished - 2004
    Event2004 International Symposium on Underwater Technology, UT'04 - Taipei
    Duration: 2004 Apr 202004 Apr 23

    Other

    Other2004 International Symposium on Underwater Technology, UT'04
    CityTaipei
    Period04/4/2004/4/23

    Fingerprint

    Hydrophones
    Acoustics
    Boats
    Experiments
    Acoustic waves
    Ecosystems

    Keywords

    • Acoustic Tracking
    • Click
    • Hydrophone Array
    • Sperm Whales

    ASJC Scopus subject areas

    • Engineering(all)

    Cite this

    Ura, T., Bahl, R., Sakata, M., Kojima, J., Fukuchi, T., Ura, J., ... Yanagisawa, M. (2004). Acoustic tracking of sperm whales using two sets of hydrophone array. In 2004 International Symposium on Underwater Technology, UT'04 - Proceedings (pp. 103-107)

    Acoustic tracking of sperm whales using two sets of hydrophone array. / Ura, Tamaki; Bahl, Rajendar; Sakata, Masao; Kojima, Jun'ichi; Fukuchi, Tetsuo; Ura, Jun'ya; Nose, Yoshiaki; Sugimatsu, Harumi; Mori, Kyoichi; Nakatani, Takeshi; Yanagisawa, Masao.

    2004 International Symposium on Underwater Technology, UT'04 - Proceedings. 2004. p. 103-107.

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

    Ura, T, Bahl, R, Sakata, M, Kojima, J, Fukuchi, T, Ura, J, Nose, Y, Sugimatsu, H, Mori, K, Nakatani, T & Yanagisawa, M 2004, Acoustic tracking of sperm whales using two sets of hydrophone array. in 2004 International Symposium on Underwater Technology, UT'04 - Proceedings. pp. 103-107, 2004 International Symposium on Underwater Technology, UT'04, Taipei, 04/4/20.
    Ura T, Bahl R, Sakata M, Kojima J, Fukuchi T, Ura J et al. Acoustic tracking of sperm whales using two sets of hydrophone array. In 2004 International Symposium on Underwater Technology, UT'04 - Proceedings. 2004. p. 103-107
    Ura, Tamaki ; Bahl, Rajendar ; Sakata, Masao ; Kojima, Jun'ichi ; Fukuchi, Tetsuo ; Ura, Jun'ya ; Nose, Yoshiaki ; Sugimatsu, Harumi ; Mori, Kyoichi ; Nakatani, Takeshi ; Yanagisawa, Masao. / Acoustic tracking of sperm whales using two sets of hydrophone array. 2004 International Symposium on Underwater Technology, UT'04 - Proceedings. 2004. pp. 103-107
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    AU - Fukuchi, Tetsuo

    AU - Ura, Jun'ya

    AU - Nose, Yoshiaki

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