Acoustic tracking of sperm whales using two sets of hydrophone array

Proceedings of the 2004 International Symposium on Underwater Technology (IEEE Cat. No.04EX869) Pub Date : 2004-04-20 DOI:10.1109/UT.2004.1405494

T. Ura, R. Bahl, M. Sakata, J. Kojima, T. Fukuchi, J. Ura, Y. Nose, H. Sugimatsu, K. Mori, T. Nakatani, M. Yanagisawa

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引用次数: 9

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. However, little is known about sperm whales' behavior because of a shortage of methods to observe them during their dives. Our attempt is to use the autonomous 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 an 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 that our observation system is suitable for tracking 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.

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用两套水听器阵列对抹香鲸进行声学跟踪

众所周知，抹香鲸可以潜入两千多米的深处，而且它们在潜水时还会发出响亮的脉冲宽带声音，称为“咔哒声”。然而，由于缺乏在潜水时观察抹香鲸的方法，人们对抹香鲸的行为知之甚少。我们的尝试是使用自主水下航行器(AUV)作为抹香鲸的观察平台。AUV的任务是通过4水听器阵列监听抹香鲸的“咔哒”声，探测抹香鲸的方向，对抹香鲸进行个体识别和实时跟踪。作为这些目标的初始阶段，我们用一艘船代替AUV和一艘支援船为我们的观测系统建立了一个实验。2003年8月中旬，我们在小笠原群岛附近进行了一项试验，以测试我们的观测系统。两艘装有水听器阵列的船只主要部署在Chichijima岛的西部或东南部，水深约1000米。在五天的试验中，我们至少遇到了十四头抹香鲸。实验结果表明，该观测系统适合于对抹香鲸进行亚实时跟踪。我们还获得了足够的抹香鲸发声的声音数据，用于离线验证。目前正在对结果进行分析。该实验可作为将该技术应用于auv水下生态系统创新观测的初步步骤。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings of the 2004 International Symposium on Underwater Technology (IEEE Cat. No.04EX869)

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