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Removing Roll and Heave Artifacts from High-Resolution Multibeam Bathymetric Data

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Technical Report

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Defence R and D Canada Atlantic Dartmouth, NS

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U DRDC Atlantic recently acquired a Reson 8125 bathymetric sonar. This is a very high resolution multibeam sonar that requires accurate measurement of the instantaneous attitude and position of the vessel in order to properly determine seabed bathymetry. During early deployments of the instrument, roll and heave contamination of the bathymetric data resulted from less--than optimal configuration of the system ancillary sensors. In addition, the data show evidence of unresolved motions, mainly flex in the sonar mounting pole. U In the absence of commercial software tools to deal with this problem, a method has been developed for removing some of these artifacts from the data. It is primarily intended for use in salvaging useful information from the early data sets now that the Reson system setup has subsequently been improved, however it is likely that pole flexure will continue to be an issue when deploying this sonar on CFAV Quest. The algorithm has been implemented in Matlab The Mathworks, Inc., and a student, David Cowan, has written a version for IDL Research Systems, Inc..

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