| Presentation | 2014-08-25 Doppler effects of when sound speed and sea current vary with propagation Shokichi TANAKA, Tomoo KAMAKURA, Hideyuki NOMURA, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | 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 vaires 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) |
| Keyword(in English) | Doppler effects / Sound speed / Sea current / Pulse time width / Expansion and contraction |
| Paper # | US2014-34 |
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| Conference Information | |
| Committee | US |
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| Conference Date | 2014/8/18(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Ultrasonics (US) |
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| Language | JPN |
| 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 |
| 1st Author's Name | Shokichi TANAKA |
| 1st Author's Affiliation | Japan Radio Co., Ltd:The University of Electro-Communications() |
| 2nd Author's Name | Tomoo KAMAKURA |
| 2nd Author's Affiliation | The University of Electro-Communications |
| 3rd Author's Name | Hideyuki NOMURA |
| 3rd Author's Affiliation | The University of Electro-Communications |
| Date | 2014-08-25 |
| Paper # | US2014-34 |
| Volume (vol) | vol.114 |
| Number (no) | 190 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |