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| Presentation | 2020-08-26 13:50 A study of sound velocity profile acquisition method using Doppler shift Masato Yoshiguchi, Hanako Ogasawara, Kazuyoshi Mori (NDA)  US2020-22 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | Sound speed distribution, which is important to calculate sound propagation in the ocean, is currently estimated from a temperature profile obtained from an Expendable Bathy Thermograph (XBT) probe and a statistic salinity profile. In this calculation, as salinity is not measured value, sometimes it causes large error for estimation of sound propagation. The probe with salinity sensor is expensive, it is hard to cast it in so often like an XBT probe. In this study, authors suggest a new method for measuring sound velocity directly from a Doppler shift amount of a moving source. As the Doppler shift amount depends on the moving speed of the source and the sound speed around the source, it is possible to get the sound speed around the source from the Doppler shift acquired at a receiver if we know the source moving speed. The sound speed profile can be acquired according to the source falling like an XBT probe. Authors confirmed the proposed method by numerical calculation and a tank experiment. In a tank experiment, sound speed profile could be calculated from the Doppler shift. The difference between the sound speed acquired by the proposed method and that of conventional method is about 1 m/s and the movements of both profiles were similar. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Sound Velocity / Sound Velocity Gradient / Doppler Shift / / / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 120, no. 139, US2020-22, pp. 11-15, Aug. 2020. | |
| Paper # | US2020-22 | |
| Date of Issue | 2020-08-19 (US) | |
| ISSN | 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 | US2020-22 |
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| Conference Information | |
| Committee | US |
| Conference Date | 2020-08-26 - 2020-08-26 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Underwater acoustics, etc. |
| Paper Information | |
| Registration To | US |
| Conference Code | 2020-08-US |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A study of sound velocity profile acquisition method using Doppler shift |
| Sub Title (in English) | |
| Keyword(1) | Sound Velocity |
| Keyword(2) | Sound Velocity Gradient |
| Keyword(3) | Doppler Shift |
| Keyword(4) | |
| Keyword(5) | |
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| 1st Author's Name | Masato Yoshiguchi |
| 1st Author's Affiliation | National Defense Academy of Japan (NDA) |
| 2nd Author's Name | Hanako Ogasawara |
| 2nd Author's Affiliation | National Defense Academy of Japan (NDA) |
| 3rd Author's Name | Kazuyoshi Mori |
| 3rd Author's Affiliation | National Defense Academy of Japan (NDA) |
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| Speaker | Author-1 |
| Date Time | 2020-08-26 13:50:00 |
| Presentation Time | 25 minutes |
| Registration for | US |
| Paper # | US2020-22 |
| Volume (vol) | vol.120 |
| Number (no) | no.139 |
| Page | pp.11-15 |
| #Pages | 5 |
| Date of Issue | 2020-08-19 (US) |
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