Kongsberg Simrad EK80 - Dimensional survey accuracy requirements for ADCP operations

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Note
Calibrationmustbetakenseriously.Thenalvericationofcorrectinstallationcanonly
bedoneduringcalibrationatsea.Installationandoperationalparametersthatdonot
meettheaccuracyrequirementsmayleadtoamalfunctioningEK80system.Toachieve
thebestresults,thecalibrationmustbeplannedanddonecarefully.Iftheaccuracy
requirementsarenotmet,andthisisfoundtobethereasonforamalfunctioningsystem,
thevesselwillmostlikelyneedtobedrydockedinordertorepeatthedimensionalsurvey.
Relatedtopics
Dimensionalsurveying,page176
Surveyingthetransducerandthenavigation
sensors
Anoverallprocedurespecifyingthemaintasksisprovided.Thedetailedknowledge
abouthow
todothemeasurementsisofferedbytheconsultantsdoingthework.
Prerequisites
Determiningtherelativepositionsandorientationsofthesensorsandthetransducerwith
highaccuracyisimportant.Thisrequiresprofessionalsurveyingdonebyqualied
andtrainedpersonnelusingprovenequipmentandmethodsformaritimedimensional
surveying.Werecommendthatyouusethird-partyconsultantswithwellproven
experiencewithvesseldimensionalcontrol.Sufcienttimeandsatisfactorywork
conditionsmustbegiventothesurveywork.TheinstallationengineersfromKongsberg
Maritimeareneitherequippednortrainedtododimensionalsurveying.
Westronglyrecommendthatyoumakethedimensionalsurveymeasurementswhen
thevesselisindrydock.
Context
Allmeasurementsmustbemadeaftertheinstallationofthetransducerandthenavigation
sensorsThefollowingmeasurementsmustbemadeforeachsensor:
•Physicalpositionwithreferencetothevesselcoordinatesystem(X,YandZ)and
thechosenorigin.
•Angularvalues(pitchandroll)
•Headingwithreferencetothecentreline
Dimensionalsurveying