Relationship between Spatial Distribution of Noise Sources and Target Scatterings Observed in the 2010 Sea Trial of Ambient Noise Imaging
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概要
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An aspherical lens with an aperture diameter of 1.0 m has been designed and fabricated to develop a prototype system for ambient noise imaging (ANI). A sea trial of silent target detection using the prototype ANI system was conducted under only natural ocean ambient noise at Uchiura Bay, in November of 2010. It was verified that the targets are successfully detected under natural ocean ambient noise, mainly generated by snapping shrimps. In this study, we surveyed the relationship between the spatial distribution of noise sources and the target scattering captured by the ANI system. The observation using a pair of tetrahedron arrays was conducted at the same time as the sea trial. The estimated source positions were spread when the noises arrived from the sea bottom. Some of the sources were around the barge, and other sources were around fish preserves. On the other hand, the source positions were coincident with the barge when the noises arrived from the sea surface. The calculated scattering fields of the target showed sharp directivities. The locations of noise sources, where the ANI system can capture target scatterings with high intensities, were roughly determined at the barge around the sea surface.
- 2013-07-25
著者
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Mori Kazuyoshi
Department Of Earth And Ocean Sciences National Defense Academy
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Nakamura Toshiaki
Department Of Anesthesia Nagasaki Rosai Hospital
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Tsuchiya Takenobu
Department of Electrical and Electronic Information Engineering, Kanagawa University, Yokohama 221-8624, Japan
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Endoh Nobuyuki
Department of Electrical and Electronic Information Engineering, Kanagawa University, Yokohama 221-8624, Japan
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Ogasawara Hanako
Department of Earth and Ocean Sciences, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, Kanagawa 239-8686, Japan
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Endoh Nobuyuki
Department of Electrical, Electronics and Information Engineering, Kanagawa University, Yokohama 221-8624, Japan
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