SBP data was acquired by the 16 transducers, hull mounted BENTHOS (DATASONICS) Mod.CAP-6600
CHIRP-II profiler, with operating frequencies
ranging between 2 and 7 Khz.
The pulse length was mantained at 20 ms while the trigger rates varied from
0.5 to 4 seconds according to water depth. The signal
penetration was up to 45 m below the sea floor. Some analog sections
were printed in real time on a 22" EPC recorder. Digital data were recorded
in the SEG-Y format on Magneto-Optical removable disks and hard disk.
Backups were loaded on DAT tapes, DVD and CD-ROM.
The navigation data was made available to the system by NAVPRO as VESSEL (0,0)
at a rate of aproximately 0.5 hz. The position data were recovered from routines
developed at ISMAR (read_segy) that read the SEGY header to check data
integrity and retrieve positioning and recording data. The latter were
for producing the navigation map.
SEG-Y header and trace data were also checked with the ISMAR's software
SEISPRO [Gasperini and Stanghellini(2005)].