Specifications

SimradSX90
Thesoundabsorptioninsaltwaterincreaseswiththefrequency,
thusgivingthelowerfrequenciesalongerdetectionrange.
AGC(AutomaticGainControl)
TheAGC(AutomaticGainControl)sensestheecholevelin
severaldirections,andusethisasabasisforadjustingallthe
receiverbeams.TheAGCwillthusprovideautomaticscaling
ofthedatainordertomaintainproperdynamicrangebasedon
allechovalues
Thestrengthoftheltercanbeselectedinthemenu.
RCG(ReverberationControlledGain)
TheRCGfunctionadjustthepicturetominimizeinuencefrom
bottomandsurfacereverberation.
Thestrengthoftheltercanbeselectedinthemenu.With
maximumstrengthisselected,theRCGwilleffectivelyreduce
thebottominshallowwater,whilevariationsonthebottom
willbedisplayed.Notethatscatteredshcanbeperceivedas
reverberation.TheRCGltermustthereforebeusedwithcareif
scatteredschoolsaretobedetected.
Ping-to-pinglter
TheeSimradSX90isequippedwithaping-to-pinglter(PP
Filter)toprovideacleanandsteadypresentationbyreducingthe
interferenceandnoise.Thisltercomparestheechoesfroma
selectedamountoftransmissions(pings),andanechohastobe
presentintheselectedamountofpingsinordertobepresented
onthedisplay.
Notethatinroughseas,whenthebeameasilycanmissthetarget
inseveralpings,thePPFiltermustbeusedwithcare.
TVG(TimeVariableGain)
TheTimeV ariableGain(TVG)functioncontrolsthegainof
thereceiversothataschoolwithagivensizeanddensityis
presentedwithapproximatelythesamestrengthonthedisplay,
insidetheregulatedTVGrange.Thiscanalsobeseenasalter,
becauseitreducesthenoiseclosetothevessel.Theregulated
strengthoftheTVGcanbeselectedinthemenu.
Noiselter
Thenoiselterisdesignedtoremoveunwantedacousticnoise
fromthesonarpicture.Itwillreducetheinterferencefromother
acousticsystems(sonarsandechosounders)onyourownvessel
andfromothervesselsinthevicinity.Itwillalsosuppressthe
noisefromyourownpropellersandfromothersimilarnoise
sources.
337432/A
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