
SimradMS70
Figure12Vesselcoordinatesystemwiththereferencepointonthewaterline
ADownward(Z-axis)
BStarboard(Y-azis)
CForward(X-axis)
DReferencepoint(origo)
+Y
-Y
+Z
-Z
+X
-X
(CD017013D)
A
B
C
D
Referencepointsmustbeestablishedonthevesselatselectedpositions.Theseare
neededduringmeasurementsofthesensorpositions.Visualmarkingsatthesepositions
shouldbepreparedandnotedonthevesseldrawingswithX,YandZcoordinatesinthe
vesselcoordinatesystem.
Sensorlocations
TheMS70transducerarraymustbelocatedaccordingtotheguidelinesgivenelsewhere
inthismanual.Withregardtothelocationofothersensorsthefollowingguidelines
shouldbefollowed,butotherwiseshouldbechosenaccordingtothemanufacturer’s
documentation.
Motionsensor
Thesystemmotionsensorshouldnormallybemountedonthecentrelineofthevessel,
eitherclosetotheMS70transducerarray,orclosetothevessel’scentreofgravity.
Thelatterpointisrecommendedifthesensorisusedforotherpurposesthanjustwith
theMS70,orifitsaccuracyissensitivetohorizontalaccelerations.
Ifthereisanypointinthefore-aftdirectionwhichdoesnotchangeheightwithrespect
tothewaterlinewithchangesinvesselspeed,thenthisistheideallocationforthe
motionsensor.Thiswilleliminateanyerrorsfromsquatinducedheightchangeswhich
isnotmeasuredbycurrentmotionsensors.
Note
Ifthefore-and-aftdistancebetweenthetransducerarrayandthemotionsensorislarger
than20m,thesystemaccuracymaybedegraded.
Themotionsensormustbealignedwiththevesselcentreline.
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