
Transducerinstallation
Headingsensorcalibration
Itmaynotbepossibletocalibratetheheadingsensoraccuratelyenoughthroughsea
trials,sothecalibrationisnormallydonewiththevesselberthed.
Onthequaythegeographicalcoordinatesoftwopointsmustbeknownormeasuredso
thattheheadingofalineonthequaycanbeestablishedtoanaccuracyofbetterthan
±0.1°.Thedistancefromtwopointsonthecentrelineofthevessel(foreandaft)are
thenmeasuredsothatthevessel’sheadingcanbecalculated.Theheadingsensoristhen
alignedtothisheadingoritsmeasuredoffsetdetermined.
Thevesselmustbeturned180°asmanytimesasnecessarywiththealignmentoroffset
checkeduntilthemeanerroriswithinthespecicationsoftheheadingsensor.
Alignmentsummary
Thetablebelowgiveasummaryoftherequirementstotheaccuracyofthemeasurements.
Table1Alignmentsummary
Sensor
Measurement
Accuracy
TransducerarrayPosition(x,y)[m]
±0.05
TransducerarrayPosition(z)[m]
±0.02
TransducerarrayPitch[deg]
±0.10
TransducerarrayRoll[deg]
±0.025
TransducerarrayHeading[deg]
±0.50
MotionsensorPosition(x,y)[m]
±0.05
MotionsensorPosition(z)[m]
±0.10
MotionsensorPitch[deg]
±0.05
MotionsensorRoll[deg]
±0.05
MotionsensorHeading[deg]
±0.10
HeadingsensorHeading[deg]
±0.10
Positioningsystem(antenna)Position(x,y)[m]
±0.05
Positioningsystem(antenna)Position(z)[m]
±0.02
WaterlinePosition(z)[m]
±0.02
331549/B
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