Fishing Echo Sounder (Simrad EK 60 / EK 80)

Attention:

Please note that operations of the Fishing Echo Sounder Simrad EK 60 / EK 80 requires experienced scientific staff on board and can be only operated on request. The system is not operated by the ship's crew. Request operations with the Fishing Echo Sounder Simrad EK 60 / EK 80 to AWI-Logistics in sufficient time prior to the cruise and clarify the data transfer after the cruise.

Data quality of Fishing Echo Sounder Simrad EK 60 / EK 80 is decreased by operating other Echo Sounders. Repeatable disturbances were detected from simultaneously operating a) POSIDONIA, b) Sonar Doppler Speed Log DOLOG and c) Sediment Echo Sounder Parasound P70. Switch off these Echo Sounders for high data quality.

Summary

The sounder operates several frequencies simultaneously thus allowing to detect fish in different depths.

Manufacturer	Kongsberg
Model	Simrad EK 60 / EK 80
Serial No.	n/a
Type	echo sounder

Transducer Frequency:

18, 38, 70, 120, 200 kHz

Contacts

Name	Institution	Role
Sören Krägefsky	Alfred-Wegener-Institute for Polar and Marine Research	Engineer In Charge
Sören Krägefsky	Alfred-Wegener-Institute for Polar and Marine Research	Data Scientist
Snoeijs-Leijonmalm	Stockholm University	Data Provider
Alfred Wegener Institute for Polar and Marine Research	Alfred Wegener Institute, Helmholz Centre for Polar and Marine Research	Owner
polarstern dship	Alfred-Wegener-Institute	dship connector
Giulia Castellani	AWI	Data Provider
Svensson		Data Provider

Components

The system consits of five "split beam" transducers (ES-18, ES-38B, ES-70-7C, ES-120-7C, ES-200-7C) located in the box keel, five General Purpose Transceivers (GPTs), two EK80 WBTs (45-90 kHz, 90-160 kHz) and a computer with installed data acquisition and processing software ER60 and EK80 in room A113.

Subdevices

Name	Model	Type
Calibration System for Simrad EK60/EK80		small scale facility
F120/200_kHz transducer	Simrad EK60/EK80	not assigned
F18_kHz transducer	EK60/EK80	echo sounder
F38_kHz transducer	Simrad EK60/EK80	not assigned
F70_kHz transducer	Simrad EK60/EK80	not assigned

Position

Origin Description:	xyz-position calculated from Alignment Survey Report RV Polarstern (2016), transducers located in box keel, electronics located in E525, computers located in A113
X:	73.14 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)
Y:	0.022 m (Y-0 at centerline, positive Y-axis is portside )
Z:	0.012 m (Z-0 is set to the lowest point of the keel, positive Z-axis is upwards)

Data logging, storage and archiving

Logged parameters

Parameter	Sensor Output Type	Unit
depth	depth	m

Central geographical ship's position and time standard

Time synchronising of the computers is regulated via the affiliation to the Windows domain. Additionally, the NMEA-String ZDA is stored in the data files.
The geographical ship's position is transferred to the Master PC together with the NMEA-String and to the data files. There is no centering of the GPS Position to the transducers.

Rawdata storage on board

Mass data: The data acquisition and processing software ER60 creates rawdata in the mass storage. Please note that there will be a transit from Simrad EK60 to EK80 in 2018 changing data structure and volume.

root directory	\\polsrv1\data01\fishsounder\|
directory name	CruiseNo e.g. ANT25_3
file name	CruiseNo-Dyyyymmdd-Thhmmss.raw with: yyyy = year mm = month dd = day hh = hour mm = minute ss = second e.g. ANT25_3-D20090113-T144735.raw
Data volume (MB per day) ca	3500
Number of files per day ca	100

Dship

Reduced set of measurement data.

Device name	fishing echo sounder
Parameters	depth (18 kHz) [m]; depth (38 kHz) [m]; depth (70 kHz) [m]; depth (120 kHz) [m]; depth (200 kHz) [m]

Data archiving on land

After the cruise, the operator transfers the measurement data along with required meta data to AWI after consultaion with the data scientist and AWI Logistics. Then, the data including meta data can be extracted from https://www.pangaea.de/ (for authorized users only). DShip data set can be extracted from https://dms.awi.de.

File format(s)	*.txt
Calibration certificates	NO

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