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Comment: Automatically updated by Sensor2Confluence-Transporter (polarstern@ingestsrv1)


Note
titleAttention:

The Doppler Log (DO-Log) is part of nautical equipment. The operation belongs to the bridge only.

The new DO-Log system was installed in December 2017.

Summary

Sensorweb integration
urnvessel:polarstern:do-log
contenttypeSummary

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.


Sensorweb integration
urnvessel:polarstern:do-log
contenttypeMetadata
ManufacturerSkipper Electronics A/S
ModelDL850
Serial No.Transducer 1 S/N: 17889, Transducer 2 S/N: 17895
Typespeed log
SENSOR-Link↪


Sensorweb integration
urnvessel:polarstern:do-log
contenttypeImages


Transducer Frequency:

Metadata (Metadata Plugin)
0Frequency
270 kHz

Contacts

Sensorweb integration
urnvessel:polarstern:do-log
contenttypeContacts
Name Institution Role
Reederei LaeiszF. LaeiszEngineer In Charge


Components

Metadata (Metadata Plugin)
0Components
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

Sensorweb integration
urnvessel:polarstern:do-log
contenttypeSubdevices
Name Model Serial Number SENSOR-
Link
DOLOG_1A transducerDOLOG n/a↪
DOLOG_1B transducerDOLOG n/a↪
DOLOG_2 transducerDOLOG n/a↪


Position

Sensorweb integration
urnvessel:polarstern:do-log
contenttypeLocalFrame
Infoxyz-position calculated from Alignment Survey Report RV Polarstern (June 2016), transducer located in box keel, electronics located on F-deck room F632
X69.366 m
(X-0 is at the center of der rudder (ref. design drawing of the vessel), positive X-axis is forward and along vessel centerline)
Y0.415 m
(Y-0 at centerline, positive Y-axis is portside)
Z0.014 m
(Z-0 is set to the lowest point of the keel, positive Z-axis is upwards)


Data logging, storage and archiving

Logged parameters

Sensorweb integration
urnvessel:polarstern:do-log
contenttypeParameters
Parameter Sensor Output Type Unit
speed bottomtrack acrossspeedknot
speed bottomtrack aheadspeedknot
speed watertrack acrossspeedknot
speed watertrack aheadspeedknot


Central geographical ship's position and time standard

Metadata (Metadata Plugin)
0timestandard
Time synchronising is regulated by DShip.
Geographical ship's position is provided by DShip.

Rawdata storage on board

Metadata (Metadata Plugin)
0Rawdata
Data storage in DShip system.

Dship

Metadata (Metadata Plugin)
0DShip
Uncorrected measurement data.


Metadata list
|| 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

Metadata (Metadata Plugin)
0DataOnLand
After the cruise the DShip data set can be extracted from https://dship.awi.de/.


Metadata list
|| File format(s) | *.txt || 
|| Calibration certificates | NO ||

Documentation

Sensorweb integration
urnvessel:polarstern:do-log
contenttypeResources