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Paper Abstract and Keywords
Presentation 2015-08-24 16:10
Influence of Noise Spatial Distribution on Ambient Noise Imaging with Acoustic Lens -- Preliminary Data Analysis for the 2nd Sea Trial in November of 2014 --
Kazuyoshi Mori, Hanako Ogasawara (NDA), Takenobu Tsuchiya, Nobuyuki Endoh (Kanagawa Univ.) US2015-44
Abstract (in Japanese) (See Japanese page) 
(in English) Recently, we built a 2nd prototype ambient noise imaging (ANI) system using the acoustic lens having a 2-D receiver array with 127 elements corresponding to a field of view 15 degrees horizontally by 9 degrees vertically, and it is possible to record 127 output signals of the 2-D array continuously. In this study, we investigated the influence of the spatial noise distribution on the target image obtained by ANI. Here, the noise sources in front of the target are called ‘front light’, and those in rear of the target are called ‘back light’. In November 10-14, 2014, targets arranged in the field of view were imaged, and the positions of noise sources were also measured in the 2nd sea trial at Uchiura Bay. In the front light, the received intensities of the target directions were greater than those of other directions due to the dominant target scatterings. Reversely, in the back light, the received intensities of the target directions were lower than those of other directions due to the dominant direct noises such as ‘silhouette’.
Keyword (in Japanese) (See Japanese page) 
(in English) Ambient Noise Imaging / Acoustic Lens / Noise Spatial Distribution / / / / /  
Reference Info. IEICE Tech. Rep., vol. 115, no. 186, US2015-44, pp. 37-41, Aug. 2015.
Paper # US2015-44 
Date of Issue 2015-08-17 (US) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
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All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee US  
Conference Date 2015-08-24 - 2015-08-24 
Place (in Japanese) (See Japanese page) 
Place (in English) Tokyo Institute of Technology, Ookayama Campus 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Underwater Acoustics, General(Co-Organization:The Marine Acoustics Society of Japan) 
Paper Information
Registration To US 
Conference Code 2015-08-US 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Influence of Noise Spatial Distribution on Ambient Noise Imaging with Acoustic Lens 
Sub Title (in English) Preliminary Data Analysis for the 2nd Sea Trial in November of 2014 
Keyword(1) Ambient Noise Imaging  
Keyword(2) Acoustic Lens  
Keyword(3) Noise Spatial Distribution  
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1st Author's Name Kazuyoshi Mori  
1st Author's Affiliation National Defense Academy (NDA)
2nd Author's Name Hanako Ogasawara  
2nd Author's Affiliation National Defense Academy (NDA)
3rd Author's Name Takenobu Tsuchiya  
3rd Author's Affiliation Kanagawa University (Kanagawa Univ.)
4th Author's Name Nobuyuki Endoh  
4th Author's Affiliation Kanagawa University (Kanagawa Univ.)
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Date Time 2015-08-24 16:10:00 
Presentation Time 25 minutes 
Registration for US 
Paper # US2015-44 
Volume (vol) vol.115 
Number (no) no.186 
Page pp.37-41 
#Pages
Date of Issue 2015-08-17 (US) 


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