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Paper Abstract and Keywords
Presentation 2014-08-25 13:25
Doppler effects of when sound speed and sea current vary with propagation
Shokichi Tanaka (JRC/UEC), Tomoo Kamakura, Hideyuki Nomura (UEC) US2014-34
Abstract (in Japanese) (See Japanese page) 
(in English) Abstract Doppler sonar and acoustic Doppler current profiler(ADCP) use Doppler effects by assuming that the sound speed is independent of water depth, being constant. Actually, however, the sound speed in the ocean varies with water depth and the assumption of the constant sound speed has a potential of causing some measuring error. Unfortunately, the equations of depth-dependent Doppler shift have not been reported so far so long as the authors know. Likewise, the effects of sea current on the measuring error of Doppler shift have not been reported. Accordingly, the paper derives the equations of Doppler shift by taking account of the sound speed and sea current that are dependent on propagation path. Using the derived equations, the influence of the sound speed and sea current on Doppler effects is investigated. As a result, it has been found that only the sound speeds at both the source position and target position affects Doppler effects and that the sea current does not basically affect Doppler shift.
Keyword (in Japanese) (See Japanese page) 
(in English) Doppler effects / Sound speed / Sea current / Pulse time width / Expansion and contraction / / /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 190, US2014-34, pp. 7-12, Aug. 2014.
Paper # US2014-34 
Date of Issue 2014-08-18 (US) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 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)
Download PDF US2014-34

Conference Information
Committee US  
Conference Date 2014-08-25 - 2014-08-25 
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 2014-08-US 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Doppler effects of when sound speed and sea current vary with propagation 
Sub Title (in English)  
Keyword(1) Doppler effects  
Keyword(2) Sound speed  
Keyword(3) Sea current  
Keyword(4) Pulse time width  
Keyword(5) Expansion and contraction  
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1st Author's Name Shokichi Tanaka  
1st Author's Affiliation Japan Radio Co.,Ltd./ The University of Electro-Communications (JRC/UEC)
2nd Author's Name Tomoo Kamakura  
2nd Author's Affiliation The University of Electro-Communications (UEC)
3rd Author's Name Hideyuki Nomura  
3rd Author's Affiliation The University of Electro-Communications (UEC)
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Speaker Author-1 
Date Time 2014-08-25 13:25:00 
Presentation Time 25 minutes 
Registration for US 
Paper # US2014-34 
Volume (vol) vol.114 
Number (no) no.190 
Page pp.7-12 
#Pages 6 
Date of Issue 2014-08-18 (US) 

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