Current direction-current meter |
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| 申请号 | JP9604084 | 申请日 | 1984-05-14 | 公开(公告)号 | JPS60239672A | 公开(公告)日 | 1985-11-28 |
| 申请人 | Nec Corp; | 发明人 | OZAWA YUUJI; | ||||
| 摘要 | PURPOSE:To accurately measure a tidal current by a eliminating the effect of the speed of an underwater running body even during the running of said running body, by calculating the current direction and velocity of a tidal current from the relative speed in static water and ground speed of the underwater body. CONSTITUTION:The speed V of an underwater running body 3 in static water is calculated. Next, the operation quantity (propeller, rudder) (n) of an actuator 4 is detected by a detector 5 while thrust F acting on the underwater running body 3 is stored in motion characteristic memory 6. The operation quantity (n) and the thrust F are preliminarily calculated and compared with measured values to calculate the static water speed V of the underwater running body 3. Acoustic beam 10 is emitted to the bottom of sea from Doppler sonar 9' and the ground speed V' of the underwater running body 3 by the reflection of said beam. The tidal current speed Vc is calculated by subtracting the static water speed V from the ground speed V'. Therefore, the flow speed of a tidal current can be measured with high accuracy even during the running of the underwater running body. | ||||||
| 权利要求 | |||||||
| 说明书全文 | |||||||
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