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NAVIGATION AND DATA ACQUISITION

The vessel was set-up for data acquisition and navigation with PDS-2000 software by RESON, interfacing by a multiserial and Ethernet link several instruments, among them the DGPS (Fugro), the Atlas-Krupp Deso-25 single-beam echosunder, the MAHRS MRU and the meteorological station.

The position and depth data were also distributed to the CTD data acquisition console. A Kongsberg processor running the SIS software, collected the multibeam data, including a SEAPATH MRU, compass, and DGPS. The MBES was the 70kHz, 400 1x2°, 150°aperture EM-710 (2000 m range) model by Kongsberg, with sonar head positioned on the ship's keel using a V-shaped steel frame. A Sound Velocity probe at the keel 1m above the Sonar Head is interfaced directly to the MBES processor, thus providing the necessary real-time data for the beam-forming. CTD casts were used for input of the sound velocity profile to the system. An Anderaa Meteorological Station was also made available, at a rate of one measurement every 5 minutes.


Table 3: Instrumental Offsets of PDS2000 on Ship Urania (PDS2000). The GPS antenna (primary positioning system) is located on point DGPS.
POSITION ACROSS ALONG HEIGHT
REFERENCE POINT 0.00 0.00 0.00
DGPS 1.64 14.30 14.18
MBEAM 0.00 14.36 -4.96
MAHRS 0.00 0.0 -3.40
ECHO SOUNDER 33 5.50 -1.85 -3.80
CHIRP -1.0 11.80 -4.00
A-FRAME 6.5 -6.70 0.0
STERN 0.00 -30.60 0.00



Table 4: Instrumental Offsets on Ship Urania (EM710). The DGPS antenna (primary positioning system) is located on point SEAPATH_GPS.
POSITION ACROSS ALONG HEIGHT
REFERENCE POINT 0.00 0.00 0.00
SEAPATH_GPS -4.039 0.163 -18.211
MRU -0.341 -1.342 -1.596
MBEAM_TX 0.0936 10.2964 5.0623
MBEAM_RX -0.0031 11.0144 5.0600
SEALEVEL 0 0 -0.0875



next up previous contents
Next: MULTICHANNEL REFLECTION SEISMIC DATA Up: MATERIALS AND METHODS Previous: MATERIALS AND METHODS   Contents
2010-10-31