Simrad SU90 - Page 153

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•TVG(TimeVariableGain)
Whenanacousticpulseissentthroughthewater,itwillgraduallyloseitsenergy.
Thegreaterthedistancebetweenthetransducerandthetarget(s),thegreatertheloss
ofenergy.TVG(TimeV ariableGain)compensatesforthelossofacousticenergy
duetogeometricspreadandabsorption.
•Ping-PingFilter
ThePing-PingFilteranalysesthehistoricalinformationfrompreviousconsecutive
pingsinordertoremoveunwantednoiseandfalseechoesfromtheSU90presentation.
•PulseType
ThePulseTypefunctionallowsyoutoselectthe"shape"ofthetransmittedpulses
("pings").Differentshapeshavedifferentqualities.Whichpulsetypetousedepends
onthecurrentenvironmentalconditions,yourrangetothetarget(s)andthetypeand
speedofthetarget(s)youareobserving.
•Bandwidth
TheBandwidthfunctionallowsyoutoselectthefrequencyrangeintheHyperbolic
FrequencyModulated(HFM)transmissions.
•Frequency
TheFrequencyfunctionallowsyousetthecentrefrequencyfortheHyperbolic
FrequencyModulated(HFM)andLinearFrequencyModulated(LFM)transmissions
(pings),andtheoperatingfrequencyfortheContinuousWave(CW)pings.
•HorizontalTXSector
TheSU90transmitsinaswathwithmaximumhorizontalopeninganglexxx.By
meansoftheHorizontalTxSectorfunction,youcanchangethisopeningangleto
360°.ThefunctionisonlyavailableintheHorizontal,PlaneandInspectionviews.
•VerticalTXSector
TheSU90transmitsinaswathwithmaximumverticalopeninganglexxx.Bymeans
oftheVerticalTxSectorfunction,youcanchangethisopeningangleto4.9to7°.The
functionisonlyavailableintheV erticalandNavigationviews.
•RangeProjection
Thedistancetoatargetlocatedanywhereinthewatercolumncanbemeasuredintwo
ways.Thiscaneitherbethehorizontaldistancetothetarget(True),oralongthetilt
angle(Slant).TheRangeProjectionfunctiondeneshowthisdistanceismeasured.
•AGC(AutomaticGainControl)
TheAGC(AutomaticGainControl)functionrunsanautomaticanalysisoftheecho
strength.
•RCG(ReverberationControlledGain)
TheRCG(ReverberationControlledGain)functionremovesunwantedreverberation
fromthebottomandorfromtheseasurface.Thisenhancesthevisibilityofschools.
Itmayhoweveralsoremovescatteredshfromthepresentation.
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