Comparison Testing of an Underwater Laser Scanner – Summary of Co-op Work Term Project, Fall 2011

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Authors
  1. MacKenzie, C.
  2. Crawford, A.
Corporate Authors
Defence Research and Development Canada, Atlantic Research Centre, Halifax NS (CAN);Dalhousie Univ, Halifax NS (CAN) Dept of Mechanical Engineering
Abstract
Mine and Harbour defense is a key role for Canada’s Navy. Part of this task entails developing and implementing mine counter measures (MCM) that allow ships and submarines to navigate safely through whatever bodies of water their orders take them. A crucial component of this process is the detection and identification of mine like objects. Currently Autonomous Underwater Vehicles (AUVs) utilize a range of sonar scanners to locate and identify shapes that may or may not be dangerous. An advantage of sonar scanners is their ability to send out signals and form pictures in a fraction of a second. The primary challenge with sonar based systems is in properly identifying objects in the seabed images they generate. In order to be reasonably sure that a section of water is safe the sensitivity of a sonar device must be high, but this greater sensitivity results in an increased number of false positives, greatly lengthening the time taken to verify or clear a path. The purpose of this report was to examine how the ULS-100 underwater laser scanner from 2G Robotics compares to standard sonar scanners. The laser scanner produces far more detailed images of objects on the ocean floor than sonar based scanners. It creates a point cloud that can be rotated in virtual 3D space and can better measure features to more accurately identify mines. The disadvantage of this option is that the laser scanner takes much longer to form an image than sonar scanners. The study comparison concluded the

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Keywords
laser scanner;measurements;calibration
Report Number
DRDC-RDDC-2015-R061 — Scientific Report
Date of publication
01 May 2015
Number of Pages
28
DSTKIM No
CA040859
CANDIS No
801925
Format(s):
Electronic Document(PDF)

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