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337568/A

•PulseType

ThePulseTypefunctionallowsyoutoselectthe"shape"ofthetransmittedpulses

("pings").Differentshapeshavedifferentqualities.Whichpulsetypetousedepends

onthecurrentenvironmentalconditions,yourrangetothetarget(s)andthetypeand

speedofthetarget(s)youareobserving.

•Bandwidth

TheBandwidthfunctionallowsyoutoselectthefrequencyrangeintheHyperbolic

FrequencyModulated(HFM)transmissions.

•Frequency

TheFrequencyfunctionallowsyousetthecentrefrequencyfortheHyperbolicFrequency

Modulated(HFM)andLinearFrequencyModulated(LFM)transmissions(pings),and

theoperatingfrequencyfortheContinuousWave(CW)pings.

•HorizontalTXSector

TheST90transmitsinaswathwithmaximumhorizontalopeningangle360°

omnidirectional.BymeansoftheHorizontalTxSectorfunction,youcanchangethis

openingangleto180,120,90,60or30°.ThefunctionisonlyavailableintheHorizontal,

PlaneandInspectionviews.

•VerticalTXSector

TheST90transmitsinaswathwithmaximumverticalopeningangle94°.Bymeansof

theVerticalTxSectorfunction,youcanchangethisopeningangletoN/A.Thefunctionis

onlyavailableintheVerticalandNavigationviews.

•RangeProjection

Thedistancetoatargetlocatedanywhereinthewatercolumncanbemeasuredintwo

ways.Thiscaneitherbethehorizontaldistancetothetarget(True),oralongthetiltangle

(Slant).TheRangeProjectionfunctiondeneshowthisdistanceismeasured.

•AGC(AutomaticGainControl)

TheAGC(AutomaticGainControl)functionrunsanautomaticanalysisoftheecho

strength.

•RCG(ReverberationControlledGain)

TheRCG(ReverberationControlledGain)functionremovesunwantedreverberation

fromthebottomandorfromtheseasurface.Thisenhancesthevisibilityofschools.It

mayhoweveralsoremovescatteredshfromthepresentation.

•BottomFilterThreshold

TheST90providesabottomltertoreducethesometimespowerfulechofromthe

seabed.Thislterisusefulifyoutrytondshclosetothebottom.SelectaBottom

FilterThresholdvaluetocontrolthe"strength"ofthelter.Ahighernumericalincreases

thelterefciencyandreducesthebottomechoaccordingly.

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Simrad ST90 Quick Start Guide

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