Simrad PI GEOMETRY - QUICK REFERENCE GUIDE REV B Instalační manuál Strana 22

  • Stažení
  • Přidat do mých příruček
  • Tisk
  • Strana
    / 224
  • Tabulka s obsahem
  • KNIHY
  • Hodnocené. / 5. Na základě hodnocení zákazníků
Zobrazit stránku 21
SimradSH90
Reception
Agreatefforthasbeenmadetoreduceunwantednoisetogeta
cleanandstableechopresentation.Toachievethisgoalthesonar
receiverhasthefollowinglteringpossibilities:
FMCorrelationlter
AGC(AutomaticGainControl)
RCG(ReverberationControlledGain)
Ping-to-pinglter
TVG(TimeV ariableGain)
Noiselter
FMCorrelationlter
TheFM(frequencymodulation)isasweepinfrequencies.
Thereceiverltersoutthosesignalsthatarethesameasthe
transmitted.Thisprovidesalteringeffect,whichefciently
reducesinterference,noiseandreverberation.Inadditionto
givingacleanandstableechopresentation,thiswillnormally
alsoincreasethesonarsdetectionrange.Theadvantageof
theFMcorrelationlteristhatitretainsthehighresolutionin
rangewithlongpulselengthsandhighenergy,andthatitisnot
sensitivetomovingtargets.
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
TheeSimradSH90isequippedwithaping-to-pinglter(PP
Filter)toprovideacleanandsteadypresentationbyreducingthe
interferenceandnoise.Thisltercomparestheechoesfroma
20
323775/B
Zobrazit stránku 21
1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 223 224

Komentáře k této Příručce

Žádné komentáře