AN ALGORITHM FOR ESTIMATING THE POSITION OF A TOWFISH

Authors
  1. Poeckert, R.H.
Corporate Authors
Defence Research Establishment Pacific, Victoria BC (CAN)
Abstract
In the case of a side-scan sonar the sonar transducers are mounted on a towfish and in order to obtain accurate sea bottom images the geographic position and attitude of the towfish must be known. Towfish position can be estimated either by using prediction methods based on measurements of towfish layback and depth, as well as towfish dynamics, or by direct measurements using ultra-short baseline sensors. A major source of error in determining the position of a towfish is inaccuracies in the measurement of the off-stern angle of the towfish and ship's heading. A trial conducted by DREP in 1988 demonstrated just how serious these errors can be. This technical memorandum describes efforts to determine towfish position without using either ship's heading or off-stern angle. The development of an algorithm that is successful at providing accurate relative positions of objects is described.
Report Number
DREP-TM-91-12 — Technical Memorandum
Date of publication
15 Jul 1991
Number of Pages
25
DSTKIM No
92-00114
CANDIS No
103015
Format(s):
Hardcopy;Originator's fiche received by DSIS

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