Simrad PI GEOMETRY - QUICK REFERENCE GUIDE REV B Manuel d'installation Page 183

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Basictheory
Onthissonar,youcanadjustthehorizontalandverticalgain
independentofeachother.Thehorizontalgainisusedwhenthe
sonaroperatesinahorizontalmode,forexampleBowuporTrue
motion.Ifyouswitchtoamodewithaverticalview,forexample
Truemotion/Vertical,yoursonarwillneedadifferentgainsetting
forthebeamsdirectedtowardsthebottom.
Toadjustthegain,seeHowtoadjustthegainonpage41.
WhatisRCG?
RCGmeansReverberationControlledGain.Thisisa
two-dimensionallteringofthereceivedechoesinorderto
suppressunwantedsurfaceandbottomreverberation.
IfyouselectStrong,thebottomechoeswilldisappearaltogether
ifthebottomisat,whileschoolsofshclosetothebottom
willbeeasiertosee.
NotethatscatteredshmaybemoredifculttospotiftheRCG
functionisactive,asthesecanbemisinterpretedasreverberation.
ItisthereforeimportantthatyouusetheRCGwithgreatcareif
youraresearchingforscatteredsh.
Abouttilt
Thesonarbeamcanbetiltedverticallyinstepsof1degree,and
thechosentiltisshownonthesonarpicture.At0degreestilt
youwilltransmitthesonarbeaminparallelwiththeseasurface,
while60degreestiltwilldirectitalmoststraightdown.
Figure41Tilt
(CD015005D)
C
B
A
Thechallengewillalwaysbetondatiltthatpreventsthesh
echoestobeburiedinreverberationandbottomechoes.
Ifyouuseahightiltvalue(A)theshwilleasilybedisguised
bythebottomechoes,butastrongRCGsettingwillhelp.As
thedistancefromthebottomtotheshincreases,theshwill
323775/B
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