Simrad SU90 - Reducing Bottom and Surface Reverberation with the RCG (Reverberation Controlled Gain) Function

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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