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The Doppler log measures speed through water by using the Doppler effect of sound signal reflected from the seafloor or from suspended matter in the water column. Two transducer are installed in the ships keel and can be alternatively used. Hydroacoustic frequency amounts to 270 kHz. vessel:polarstern:do-log (626) |
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| 270 kHz||||
Contacts
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Components
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The system consists of two transducer elements installed in the ship's keel. The transducers can alternatively be used, e.g. one is backup. Electronic cabinet is mounted in Gravitymeter Room F-632. Hydroacoustic frequency amounts to 270 kHz. Transducer 1 S/N: 17889; Transducer 2 S/N: 17895. | ||
Subdevices
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Position
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Central geographical ship's position and time standard
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| Time synchronising is regulated by DShip.
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Rawdata storage on board
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| Data storage in DShip system.
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Dship
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Uncorrected measurement data. | ||
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|| Device name | DO-Log ||
|| Parameters| speed bottomtrack across \[kn\]; speed bottomtrack ahead \[kn\]; speed watertrack across \[kn\]; speed watertrack ahead \[kn\] || |
Data archiving on land
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| After the cruise the DShip data set can be extracted from https://dms.awi.de.
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Documentation
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