NDLI: Preliminary analysis of background noise distribution in the ocean experiment 2010 of Ambient Noise Imaging

Content Provider	IEEE Xplore Digital Library
Author	Mori, K. Ogasawara, H. Nakamura, T. Tsuchiya, T. Endoh, N.
Copyright Year	2013
Description	Author affiliation: Dept. of Electr., Electron. & Inf. Eng., Kanagawa Univ., Yokohama, Japan (Tsuchiya, T.; Endoh, N.) \|\| Dept. of Earth & Ocean Sci., Nat. Defense Acad., Yokosuka, Japan (Mori, K.; Ogasawara, H.; Nakamura, T.)
Abstract	We previously designed and made an aspherical lens with an aperture diameter of 1.0 m for Ambient Noise Imaging (ANI). The prototype system was developed by mounting the hydrophone array on the image surface of this lens. In the ocean experiment 2010 of ANI, this system was deployed through the barge OKI SEATEC II moored in Uchiura Bay on November 8-13, 2010. First, we measured the directivity of this lens using a pinger sound of 120 kHz. It was verified that the prototype ANI system with this lens realized the directional resolution with a beam width of 1 degree at the center frequency of 120 kHz over the field of view from -7 to +7 degrees. In the data analysis results of the silent target detection trials, we successfully detected target scatterings using only ocean natural background noise, which was generated mainly by snapping shrimps. In this study, background noise distribution was observed at the same time as this experiment was conducted. We used a pair of tetrahedral arrays in this observation. Here, four hydrophones were mounted at distances of 1 m on each of two arrays which themselves were located about 10 m apart and about 5 m below the surface. The noise source positions were estimated by the arrival time differences of transient noises received by hydrophone arrays. In the preliminary results for the spatial densities of noise sources, the noise sources were spread when the noises arrived from the sea bottom. Some of the sources were around the sea bottom just under the barge, and other sources were around the sea bottom just under fish preserves. The sources were coincident with the barge when the noises arrived from the sea surface. Considering the directivity of the target scattering, it was suggested that the locations of noise sources, where the ANI system can capture target scatterings having high intensities, were at the barge around the sea surface.
Sponsorship	Japan Council OE Chapt.
Starting Page	1
Ending Page	4
File Size	1121956
Page Count	4
File Format	PDF
ISBN	9781467359481
e-ISBN	9781467359498
DOI	10.1109/UT.2013.6519884
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-03-05
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Noise Boats Arrays Sea surface Scattering Transient analysis
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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