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© GeoAcoustics 2008
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Digital Side Scan Sonar
Standard System The standard system employs an aluminium tow fish and can operate to a depth of 1000 metres. The basic system includes the following:
Options include a stainless steel towfish rated to 3,000 metres, processing software, interfaces to additional hardware, tow cables and deck cables. Deck Unit - GeoAcoustics Universal Transceiver The GeoAcoustics Universal Transceiver contains power supplies and all connections and interfaces, to power the towfish down the tow cable; to facilitate bidirectional communication for control and status reporting: and to transfer data from the towfish. The ultra high dynamic range means that no user controls are necessary to acquire raw digital data of the highest possible quality. The Deck Unit includes GPS interfaces and automatically synchronises the towfish to GPS time using the 1PPS signal. This ensures accurate absolute time stamping for all data. The system also has real time triggering capability to allow the use of responders for accurate towfish positioning relative to the vessel. The digital sonar data is also streamed out on Ethernet for use in real time by a digital acquisition system.
Sub Sea Electronics The sub-sea electronics of the Side Scan Sonar system can be mounted in a towfish, on a combined towfish or on an AUV or ROV. The use of standard sub-sea connectors and standard protocol interfaces allows easy installation in all situations. The sub-sea electronics unit includes all sonar transmitter and receiver electronics as well as digital signal processing, attitude sensor, magnetometer interface, and tow cable data transmission. This ensures lossless sonar data transfer and highly repeatable sonar performance regardless of cable length. The robust high speed (8Mbits/sec) data transfer system, high raw data resolution (24 bits) and high output data rate (50 kHz) eliminates any bandwidth/resolution trade-offs inherent in other digital sonar systems. Features
Options
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The
GeoAcoustics Digital Side Scan (DSSS) is the highest dynamic range single beam
dual frequency side scan commercially available. This highly advanced
system allows precisely repeatable seabed feature mapping in a robust and
reliable package. The system utilises high resolution direct
digital sampling of the received signals, and full digital processing. This new
technology offers unprecedented resolution and dynamic range (24 bit),
simultaneous dual frequency operation (114/410 kHz), digital filters, pulse
width auto adjust to optimise for any sample rate setting and a new high speed
digital link enabling very long lengths of low drag co-axial tow cable to be
used. The system configuration, low power and small size make this system
ideally suited for installation onto a Remotely Operated Vehicle (ROV),
Autonomous Underwater Vehicle (AUV) as well as combined profiler/magnetometer
tow fish.
