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01292 am a22001453u 4500 |
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|a Griffiths, G.
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|a Enoch, P.
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|a Millard, N.W.
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|a On the radiated noise of the Autosub autonomous underwater vehicle
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|c 2001.
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|u https://eprints.soton.ac.uk/256/1/GRIFFITHS_AUV_Noise_final.doc
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|a Autonomous Underwater Vehicles (AUVs) can be very quiet platforms from which to make observations of marine living resources. With few moving parts and very low propulsion power they should have a very low underwater radiated noise signature. The purpose of this paper is to describe measurements on Autosub to test this assumption. The measured noise level and spectrum are compared to the ICES proposal for the radiated noise of fisheries research vessels. Integrated over the band 100 Hz to 5000 Hz the AUV source level, at 124 dB relative to 1mPa at 1 m, was about 39 dB below of the ICES specification and about 30 dB quieter than the noise-reduced vessel "Scotia". Autosub is in fact exceedingly quiet. The difficulties of making measurements of the underwater radiated noise of a quiet submerged vehicle are discussed and suggestions are made for improvements in techniques.
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