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TECHNICAL ARTICLES
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Published in issue No 109, July 2003 of The Hydrographic Journal
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AN EVALUATION OF USBL AND SBL ACOUSTIC
SYSTEMS AND THE OPTIMISATION OF METHODS OF CALIBRATION – PART 2
D R C Philip DipHS, FRICS Philip &
Associates Ltd, UK
Part 1 was published in The Hydrographic Journal No.
108, April 2003
Abstract
The paper will first review the history and development of Ultra Short Baseline
(USBL) and Short Baseline (SBL) systems and highlight the issues in current
practice. A detailed evaluation of the various component parts of a complex
‘hybrid’ system will then be presented. This will highlight the significance and
potential sources of error present in the various types of observations used to
determine position and depth. A brief summary of the particular mathematics
required to solve the 3-D solutions will be followed by a review of various
geometrical options for data collection and their validity, strengths and
weaknesses in determining the correct calibration corrections. Some problems,
pitfalls and puzzling observed practices will be presented and discussed. This
will be followed by an illustrative example of critical analysis of a USBL
calibration data set. Final conclusions will be drawn and the potential
developments for offshore positioning will be suggested.
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