A Feasibility Study on an Optical Positioning System to Correct for Dynamic Hydrophone Array Shape Variations

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Authors
  1. Dittman, R.D.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Marentec, Dartmouth NS (CAN)
Abstract
The following report describes an analysis of a conceptual optical positioning system for meausring the shape of a hydrophone array underwater. The analysis involved the design and construction of a prototype test system comprised of commercially available electronic components. The conceptual system determined the shape of an underwater mooring by positioning tracking targets mounted at fixed points along the mooring. The prototype used a small sensitive black and white camera as the positional detector and high intensity light emitting diodes as tracking targets. The system was examined for its potential range capabilities and spatial resolution underwater. Tests were specifically conducted on the range limits of the system in air. freshwater, and seawater. The results suggested that the spatial resolution of the system was better than 26 cm with target ranges as great as 65 metres. They also indicated, however, that water born attenuators could dramatically reduce the systems operational range limit. Field tests within near-shore waters of Nova Scotia, for example, found range limits closer to 20 metres.

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Keywords
Optical positioning systems
Report Number
DREA-CR-2001-021 — Contractor Report
Date of publication
01 Mar 2001
Number of Pages
47
DSTKIM No
CA020694
CANDIS No
517410
Format(s):
Document Image stored on Optical Disk

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