HF Sonar Performance in Whitecaps and Wakes

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Authors
  1. Trevorrow, M.V.
  2. Vagle, S.
Corporate Authors
Defence Research and Development Canada, Atlantic Research Centre, Halifax NS (CAN)
Abstract
Small air bubbles present in the near the ocean surface are well known to interfere with the operation of High Frequency (HF, > 10 kHz) active sonars. These bubbles are naturally created by breaking surface waves (whitecaps) [1] and also generated by propeller and hull effects in a ship wake [2]. In both cases these bubbles are predicted to limit the performance of horizontally-oriented HF sonars operated from a ship [1,3]. Such sonars have been previously utilized for forward-looking obstacle avoidance and in-harbor surveillance purposes. There is renewed interest in such sonars for close-in ship defence purposes. In order to specifically assess HF sonar performance in the vicinity of a ship a sea-trial was conducted on the CCGS Vector April 8 to 14, 2015 in BC south coast waters.
Keywords
multibeam sonar;bubbles;ship wakes
Report Number
DRDC-RDDC-2015-N018 — External Literature
Date of publication
06 Nov 2015
Number of Pages
2
DSTKIM No
CA041373
CANDIS No
802507
Format(s):
Electronic Document(PDF)

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