Simrad ST90 - Acoustic Noise; Introduction to the Acoustic Noise Challenge; Contributing Factors

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Acousticnoise
Topics
Introductiontotheacousticnoisechallenge,page76
Contributingfactors,page76
Selfnoise,page78
Ambientnoise,page80
Electricalselfnoise,page81
Reverberation,page81
Somemeanstoreduceacousticnoise,page82
Introductiontotheacousticnoisechallenge
Aswithanyotherhydroacousticsystems,thequalityoftheST90echodataand
presentationsaresubjecttounwantedacousticnoise.Theechoesfromanylargeand
smalltargetmustbedetectedinsidethenoise.
Itisimportantthatwekeepthenoiselevelaslowaspossible.Theisnecessarytoobtain
longrangeanddependableinterpretationsoftheechoes.
EvenwiththeadvancednoiselteringofferedbytheST90,wemustaddressthe
noisechallenge.ThisisimportantduringtheplanningandpreparationsfortheST90
installation.
Relatedtopics
Acousticnoise,page76
Contributingfactors
Severalfactorsarecontributingtotheperformanceofthehydroacousticequipment
usedonboardavessel.
Factorscontributingtotheperformanceofthehydroacousticequipmentusedonboarda
vesselare:
•Thequalityandpropertiesofthetransmittedsignal
•Thequalityofthereceivingsystem
•Theoperationalsettingsmadeduringoperation
•Thepropertiesofthetarget(s)
•Thesignal-to-noiseratio
SimradST90InstallationManual