Simrad SU90 User Manual

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2OpentheActivemenu.
3SelectNoiseFilter.
4Selectavaluefromtheoptionsprovided.
Thechoiceyoumakeisbydefaultonlyappliedtothecurrentlyselected(active)
view.
Relatedtopics
Improvingtherecognitionofshandschoolsusingreceiverlters,page72
ReducingbottomandsurfacereverberationwiththeRCG
(ReverberationControlledGain)function
Whenyoutransmitanacousticpulseintothewatertosearchforatarget,echoeswill
alsobereturnedfromanyotherobjectsinthebeam.Theenergyreectedfromthese
"unwanted"objectsisreferredtoasreverberation.Reverberationisoftenalimiting
factor,especiallyifyouaresearchingforsmallertargets.
Context
TheRCG(ReverberationControlledGain)controlsthereceiverprocessing.The
algorithmhandleseachreceiverbeamindividually.Thelterreducestheunwanted
echoesfromthebottomandfromtheseasurface.Thisenhancesthevisibilityofschools.
Note
Thenumericalsettingsdonotexpressanincreasinglterstrength.Theyrepresent
specicsettingsusingdifferentalgorithms.
Thealgorithmsintheltermayinterpretscatteredshasreverberation.Use
reverberationcontrolledgaincarefullyifyouwishtodetectscatteredsh.
Operatingprocedures

Simrad SU90 Specifications

General

Brand	Simrad
Model	SU90
Category	Sonar
Language	English