Simrad SU90 - Hull Unit Orientation Example; Acoustic Noise

Preparations
Hullunitorientationexample
Hullunitorientationexamples
(CD015408-003)
BOW
Thehullunitshould
normallybeorientedwith
thehoisting/loweringmotor
pointingaft.Ifthisorientation
makestheMotorControlUnit
attachedtothehullunitdifcult
toaccessformaintenance
purposes,thehullunitmaybe
orientedinthemostsuitable
position.
Thedistancebetweenthehull
unitandtheTransceiverUnit
islimitedbythelengthofthe
transducercable.
Irrespectiveofthehullunit
orientation,thetransducershall
notbemechanicallyaligned.
Transduceralignmentis
performedintheSU90ProcessorUnitbyrotatingtheechopresentationonthedisplay.
Relatedtopics
•Alignmentofthesonarpictureonpage193
Acousticnoise
Aswithanyotherhydroacousticsystems,thequalityoftheSU90presentationsare
subjecttounwantednoise.Theechoesfromsinglesh,schoolsandothertargetsmust
bedetectedinsidethenoise.
Itisthereforeimportantthatwekeepthisnoiselevelaslowaspossibleinordertoobtain
longrangeanddependableinterpretation.Evenwiththeadvancednoiselteringoffered
bytheSU90,wemustaddressthenoisechallengeduringtheplanningandpreparations
forthesysteminstallation.
•Contributingnoisefactorsonpage48
•Selfnoiseonpage49
•Ambientnoiseonpage51
•Fishinggearnoiseonpage51
•Electricalnoiseonpage52
•Reverberationonpage52
•Somemeanstoreducethenoiseonpage52
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