DAGE-MTI Excel Series Uživatelský manuál stáhnout pdf (Strana 16)

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 DocumentMT0100P.N

©XsensTechnologiesB.V. MTiandMTxUserManualandTechnicalDocumentation

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TrueNorthvs.MagneticNorth

AsdefinedabovetheoutputcoordinatesystemoftheMTi/MTxiswithrespecttolocalMagneticNorth.The

deviationbetweenMagneticNorthandTrueNorth(knownasthemagneticdeclination)variesdependingon

your location on earth and can be roughly obtained from various models of the earth’s magnetic field as a

functionoflatitudeandlongitude.TheMTi/MTxcanacceptasettingofthedeclinationvalue.Thisisdoneby

settingthe“declination”intheMTManager,SDKorbydirectcommunicationwiththesensor.Theoutputwill

thenbeoffsetbythedeclinationandthusreferencedto“local”truenorth.

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4.1.3 North‐East‐Downoptionalaerospaceco‐ordinatesystemdefinitions

It is possible  to change the default local tangent plane Euclidean coordinate system to a North‐East‐Down

(NED)conventioncoordinatesystem.Thisisoftenusedinaerospaceapplications.ChangingtotheNEDsetting

willalso changethebody‐fixed sensorcoordinatesystem toa Zdowncoordinatesystem asindicatedin the

figurebelow.

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Figure4:MTinaNEDconventioncoordinatesystemFigure4:MTinaNEDconventioncoordinatesystem

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Local

Magnetic

North

Local

vertical

NED

MTi and MTx co-ordinate system

Z down

NED

Local tangent plane

Z down (North East Down)

NED

All co-ordinate systems are right handed.

NED

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DAGE-MTI Excel Series Uživatelský manuál Strana 16