D-SEISMIC:A VERY FLEXIBLE LOW COST-HARDWARE/SOFTWARE- SYSTEM FOR ACQUISITION, REAL TIME AND POST PROCESSING OF

• Main Authors: Giordano Francesco, Giordano Raffaele, Corradi Nicola
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Italica; Ross Sea; antartic*; Antartide
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.524.3023; http://www.sea-acustica.es/Sevilla02/unw01021.pdf

Two systems called “D-Seismic”, developed by “IMFA-Parthenope University ” and granted by “Programma Nazionale Ricerche Antartide (PNRA) of ENEA ” and by DIP.TE.RIS, have been towed on the ship Italica. These systems have been designed specifically for marine geological studies in the Antartica 2002 mission, for acquisition, storing and pre-processing of sparker and sub-bottom data. The hardware comprises an internal acquisition board with 8 channels A/D converter with 200 KHz sampling frequency, internal counter, interrupt and DMA capabilities. The software of D-seismic was developed for Windows OS and has about 10.000 lines of code. Some of the main features are a friendly user graphical interface and a programmable Real Time Varying Gain processing system for the echoes signal; GPS navigation strings are received, decoded as Navigation FIX and are displayed and stored. Data records are stored on a slave HD that has a capacity 130 days ’ worth of data storage. Some innovative utilities characterize the post-processing of the data. These systems are currently being tested with acoustical exploration techniques and characterization of the Ross Sea-bed(XVIII PNRA expedition) with a range of depth between 100-4000 m and about 60 days of uninterrupted run. Some acoustic data records, raw and processed, will be presented, along with a discussion of the results.