Sediment Echo Sounder (Parasound P70)

Attention:

Please note that operations of the Sediment Echo Sounder Atlas Parasound P70 requires experienced scientific staff on board for permanent supervision of data aquisition and storage. The system is not operated by the ship's crew. Announce operations with the Sediment Echo Sounder Atlas Parasound P70 to AWI-Logistics prior to the cruise and clarify the data transfer after the cruise.

Summary

Transducer Frequency

High frequency: 19 - 38 kHz; Parametric signal: 0.5 - 6.0 kHz

Contacts

Components

The system consits of the transducer, the electronic unit, two computers with installed data acquisition and processing software ParaStore and the subsidiary display on the bridge.
The transducer consists of four segments and is mounted without ice protection window in the box keel. The transducer transmits in the frequency range of 18 - 39 kHz and reaches water depth of 10 to 11000m. Frequency interferences generate "parametric low frequencies" between 0.5 and 6.0 kHz. Penetration depth into the sediment accounts for > 200m (depending on sediment properties) and the resolution is 6.1 cm.

Position

Data logging, storage and archiving

Logged parameters

Central geographical ship's position and time standard

Time synchronising is carried out via NMEA-telegram from the ZDA data set or via ntp between DIP2 and the central ntp-server of the on-board network. DIP2 functions as ntp-server for the computers and residual DIPs of the Parasound System.
The recorded geographical ship's position is the location of the central motion sensor MINS. The lever between transducer and the central motionsensor MINS is considered.

Rawdata storage on board

Mass data: The data acquisition and processing software ParaStore creates rawdata on the local drive depending on system configuration. PHF = primary high frequency beam amplitudes, SLF = secondary low frequency beam amplitudes, SHF = secondary high frequency beam amplitudes. Synchonising of the local data directory to mass storage has to be carried out manually. A reduced set of uncorrected measurement data is stored to the DShip system.

root directory	R:\data01\parasound\|
directory name	CruiseNo\XXX_ASD_YYYYMMDD CruiseNo\XXX_PS3_YYYYMMDD CruiseNo\XXX_SGY_YYYYMMDD CruiseNo\screenshots CruiseNo\PSAUX CruiseNo\DSHIP with XXX = PHF, SLF or SHF YYYY = year MM = month DD = day e.g. ANT25-3\PHF_ASD_20090113\ ...
file name	PS3XXX_YYYY-MM-DDThhmmssZ_<identNo>.asd.acf PS3XXX_YYYY-MM-DDThhmmssZ_<identNo>.asd.acf.idx XXXYYMMDDhhmm.ps3 XXXYYMMDDhhmm.sgy YYYYMMDD-YYYYMMDD\YYYYMMDD_hhmm*.bmp ??? NAV_YYYYMMDD-YYYYMMDD.txt with XXX = PHF, SLF or SHF YYYY = year MM = month DD = day hh = hour mm = minute ss = second <identNo> = 8-digit running number e.g. PS3PHF_2009-01-13T112415Z_00000005.asd.acf ...
Data volume (MB per day) ca	10000
Number of files per day ca	1000

Dship

Reduced set of uncorrected measurement data

Device name	parasound
Parameters	depth [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). The reduced, unevaluated DShip data set can be extracted from https://dms.awi.de.

File format(s)	stored in PANGAEA or DShip system
Calibration certificates	NO

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