NDLI: The IMI-30: a 30 kHz imaging and mapping instrument

Content Provider	IEEE Xplore Digital Library
Author	Rognstad, M.R.
Copyright Year	2005
Description	Author affiliation: Hawaii Mapping Res. Group, Hawaii Univ. at Manoa, Honolulu, HI, USA (Rognstad, M.R.)
Abstract	The Imaging and Mapping Instrument (IMI-30) is a new 30 kHz phase-bathymetric sidescan sonar developed and operated by the Hawaii Mapping Research Group at the University of Hawaii at Manoa. Capable of operation at depths of up to 6000 meters and altitudes above the seafloor of approximately 500 meters, it maps a swath up to 5 kilometers in width. This new system performs all signal processing in the digital domain, using Motorola 56309 digital signal processors to acquire signals from the vehicle's transducer arrays. All transducer channels can be driven with arbitrary waveforms during transmit, allowing both conventional CW transmissions and coded pulses with FM, AM, and/or phase modulation. Center frequencies for quadrature detection are programmable, as is decimation filtering to match the transmitted waveforms. The programmable nature of the system electronics design allows use at a range of frequencies up to 140 kHz, and is also used as part of the DSL-120A sonar operated by the Deep Submergence Laboratory at the Woods Hole Oceanographic Institute. Processed acoustic data, along with environmental parameters and electronics monitors are telemetered to the surface via optical fiber. At the surface, the sonar telemetry link is converted to a standard AES/EBU digital audio stream for compatibility with commercial off-the-shelf components making up a Linux workstation.
Starting Page	2742
Ending Page	2745
File Size	337104
Page Count	4
File Format	PDF
ISBN	0933957343
DOI	10.1109/OCEANS.2005.1640188
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-09-17
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	MTS
Subject Keyword	Instruments Sonar Optical imaging Transducers Frequency Optical surface waves Sea surface Sea floor Array signal processing Digital signal processing
Content Type	Text
Resource Type	Article

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