Assessment of HF Sonar Performance from a Surface Ship

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Authors
  1. Trevorrow, M.V.
Corporate Authors
Defence Research and Development Canada, Atlantic Research Centre, Halifax NS (CAN)
Abstract
This Scientific Report presents a quantitative analysis of sea-trial data assessing the target detection performance of a High-Frequency (HF, 100 kHz) horizontally-oriented, multibeam sonar from a surface ship. Forward-looking target detection tests were conducted in two different locations, featuring upward- and downward-refracting sound speed profiles under sea-states from 0 to 4. Ship wake effects were evaluated in aft-looking tests with a towed target at ship speeds of 6–7.5 knots. The HF sonar output was calibrated so that absolute reverberation levels and acoustic target strengths could be assessed. In forward-looking tests the targets were detected at ranges up to 580 m in low sea-states, but detection range was reduced to roughly 150–300 m under higher sea states. In the aft-looking sonar tests the target was detectable up to 450 m range. In both cases signal to noise ratios of 10–25 dB (range dependent) were routinely observed. Near-surface sound speed gradients were found to produce important acoustic propagation effects in both cases. Significant ping-to-ping variability in both target echo strength and background reverberation levels was observed in all tests. A HF sonar performance modeling tool generated predictions in reasonable agreement with the sea-trial results.

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Keywords
HF multibeam sonar;bubbles;ship wakes
Report Number
DRDC-RDDC-2016-R053 — Scientific Report
Date of publication
01 Apr 2016
Number of Pages
64
DSTKIM No
CA042521
CANDIS No
803737
Format(s):
Electronic Document(PDF)

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