The vessel was set-up for multibeam data acquisition and navigation with RESON PDS-2000. A workstation was used for the acquisition of (PDS-2000) multibeam data, interfacing by a multiserial and Ethernet link a RESON 8160 P1 processor, an IXEA OCTANS compass, DGPS receiver, by a MOXA Multi/serial I/O, TCP/IP and UDP network sockets.
The MBES was the 50kHz, 126 0.5°, 150°aperture RESON 8160 (5000 m range). The sonar head is positioned on the ship's keel using a low-angle V-shaped steel frame. A sound velocity probe at the Sonar Head is interfaced directly to the MBES processor, thus providing the necessary real-time data for the beam-forming.
The datum WGS84 and the UTM, zone 33, were chosen for navigation and display purposes. Timing was set to UTC for data acquisition. The PDS-2000 production DTM was set to grid sizes ranging from 20 to 25m. The DELPH Seismic SBP-CHIRP workstation received positions trough an NMEA sentence by the DGPS receiver. The positions were therefore recorded on the trace headers as Easting/Northing of the DGPS antenna. An ISMAR's Marine Magnetics SeaSpy Magnetometer tow fish was towed 120m (point STERN-LEFT), on the port side. An INGV's Geometrics G-811 Gradiometer system was towed 150-300m astern, on the starboard side. A gravimeter was installed very close to the center of gravity of ship.
Fig.6 shows the consoles of the main recording instruments on the recording and navigation room.
figure
The instrumental offsets (PDS-2000) are presented in Fig. 7 and in Tab. 3.
figure
