48
394149/C
Acousticnoise
Aswithanyotherhydroacousticsystems,thequalityoftheEK80presentationsaresubject
tounwantedacousticnoise.Theechoesfromanylargeandsmalltargetmustbedetected
insidethenoise.
Itisimportantthatwekeepthisnoiselevelaslowaspossibleinordertoobtainlongrange
anddependableinterpretationsoftheechoes.Evenwiththeadvancednoiseîš¿lteringoffered
bytheEK80,wemustaddressthenoisechallengeduringbothplanningandpreparations
fortheEK80installation.
Topics
Contributingfactors,page48
Selfnoise,page50
Ambientnoise,page52
Fishinggearnoise,page53
Electricalnoise,page53
Somemeanstoreduceacousticnoise,page53
Contributingfactors
Severalfactorsarecontributingtotheperformanceofthehydroacousticequipmentused
onboardavessel.
Suchfactorsinclude:
•Thequalityandpropertiesofthetransmittedsignal
•Thequalityofthereceivingsystem
•Theoperationalsettingsmadeduringoperation
•Thepropertiesofthetarget(s)
•Thesignal-to-noiseratio
Themajorityofthesefactorscanneitherbecontrollednorimprovedbymeansofinstallation
methodsortransducerlocations.Thequalityandpropertiesofthetransmittingandreceiving
systemsarekeyfactorsduringourproductdevelopment,whileourenduserdocumentation
aimstohelptheusertomaketherightîš¿ltersettingsduringoperation.Asforthetarget
properties,thereisnothinganyofuscandowiththose.
Thesignal-to-noiseratio,however,canbeimprovedbymakingthecorrectchoicesduring
installation.
SimradEK80
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