Specifications

SimradSH90
Combinationofomniandverticalslice
ThecombinationoftheOmnimodeandthevertical
slicewillgiveanoptimalvisualizationofthecatch
situation.
Multiplefrequencyoperation
Inadditiontothestandard114kHzfrequency,youcanselectanyoperationalfrequency
from111,5to115,5kHzin0,5kHzsteps.
Thisisaveryusefulfunctionwhenitisnecessarytosuppressinterferencefromother
sonars.
Stabilizationsystem
TheSimradSH90isprovidedwith
astabilisationsystem.
Whenthebeamstabilizerisactivated,
bothhorizontalandverticalbeams
willbestabilizedelectronicallyfor
rollandpitchmovementsupto±20
degrees.Thebeamdirectionwill
thenchangecontinuouslyaccordingtothevessel’smovements,andsecureanoptimal
contactwiththetargetseveninroughseas.
ThedefaultsensorforthebeamstabilizerfunctionislocatedinsidetheMotorControl
Unit.
YoucanalsoconnectanexternalmotionsensortotheSH90.Thiswillprovideamore
accuratecompensation.
Receptionltersandfunctionality
Agreatefforthasbeenmadetoreduceunwantednoisetogetacleanandstableecho
presentation.Toachievethisgoalthesonarreceiverhasseverallterfunctions.
FMCorrelationlter
TheFM(frequencymodulation)isasweepinfrequencies.Thereceiverltersoutthose
signalsthatarethesameasthetransmitted.Thisprovidesalteringeffect,which
efcientlyreducesinterference,noiseandreverberation.
Inadditiontogivingacleanandstableechopresentation,thiswillnormallyalsoincrease
thesonar'sdetectionrange.TheadvantageoftheFMcorrelationlteristhatitretains
thehighresolutioninrangewithlongpulselengthsandhighenergy,andthatitisnot
sensitivetomovingtargets.
372739/D
17