Simrad ST90 User Manual

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ReducingpropellernoiseandinterferencewiththeNoiseFilter
Unlessyousynchronizethetransmissionsfromyourotherhydroacousticsystemsyoumay
haveanissuewithinterference.Evenwithsynchronizationactivatedthenoisefromother
nearbyvesselsmaycausenoise.
Context
TheNoiseFilterisusedtominimizetheinterferencefromotheracousticssystems(sonars
andechosounders)onyourownand/orothervessels.Thelteralsosuppressesnoisefrom
yourpropellers,andfromothersimilarnoisesources.TheNoiseFilterisveryeffectiveif
youarebotheredbystrongnoiseorinterference,especiallyfromyourownvessel,oreven
fromothervesselsoperatingnearyou.
Tip
Useweakltering-orturnthelteroff-ifyouhavestrongechoesonshortranges.The
ltermaythenbetoopowerful,anddistorttheechopresentation.
TheltersintheST90areimplementedin“series”.Thenoiselteringisdoneintwo
stagesearlyinthereceiverprocess.
Procedure
1Clickinanyviewtomakeitactive.
Theactiveviewisidentiedwithathickerborder.
2OpentheActivemenu.
3SelectNoiseFilter.
4Selectavaluefromtheoptionsprovided.
Thechoiceyoumakeisbydefaultonlyappliedtothecurrentlyselected(active)view.
Relatedtopics
Improvingtherecognitionofshandschoolsusingreceiverlters,page78
Operatingprocedures

Simrad ST90 Specifications

General

Brand	Simrad
Model	ST90
Category	Sonar
Language	English