Two Methods of Bathymetry - Sidescan Sonar Data Comparison for Improved Determination of Sonar Towfish Position

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Authors
  1. Crawford, A.M.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN)
Abstract
Two methods are presented that use existing local bathymetric data to determine the position of the sidescan sonar towfish during surveys. In the absence of direct measurements of towfish position as survey work is underway, later determination of this position by other means is necessary to obtain accurately geo-referenced seabed imagery from the sonar data. The methods investigated rely on either large objects in the sonar field of view or the profile of the total water depth along the towfish survey track. Results of the analysis are compared with independent estimates derived from ship geometry and logbook calbe length entriees and from short-baseline acoustic tracking system meausrements of the range to the towfish. In the several examples shown, both methods found layback solutions within a few metres of the independent estimates.

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Keywords
Towfish;Geo-referencing;Bathymetry matching
Report Number
DRDC-ATLANTIC-TM-2002-110 — Technical Memorandum
Date of publication
01 Jun 2002
Number of Pages
34
DSTKIM No
CA022187
CANDIS No
519032
Format(s):
CD ROM

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