Friday, June 25, 2010

Side scan sonar towed array on the boat.


The side scan sonar fish, as it is known, is towed behind the boat at speeds of three to eight knots. It digitises the sea bed and produces an image up to 400m wide called a swathe. Higher frequencies give increased detail or resolution but less range. Today we found some good hits but enterpreting the data takes a lot of time. Eventually we will mosaic the data to give a coverage of the whole area for analysis and archives.
This one was developed by Myself and a few friends I used to work with.
It is a 220kHz system using a programmable processor to digitise signals and send them to the PCs USB port. The software gives lots of tools for analysing th data, recording it, zooming and measuring whilst correcting radiometric and geometric errors.

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