DAGE-MTI Excel Series Manuel d'utilisateur télécharger pdf (Page 27)

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 DocumentMT0100P.N

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

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MTi or MTx coordinate frame before (A) and after (B) object reset. The new Z‐axis of the sensor coordinate

framewillbealongthevertical.ThenewdirectionoftheX ‐axiswillbetheoldX–axisthatisprojectedon the

horizontalplane.

4.6.5 Alignmentreset

ThealignmentresetsimplycombinestheObjectresetandtheHeadingresetatasingleinstantintime.This

hastheadvantagethatallco‐ordinatesystemscanbealignedwithasingleaction.Keepinmindthatthenew

globalreferencex‐axis(heading)isdefinedbytheobjectX‐axis(towhichXZ‐planeyouhavealignedtheMTi/

MTx).

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NOTE:Oncethisalignmentresetisconducted,bothcalibrateddataandorientationwillbeoutputwithrespect

tothenewS’coordinateframe.

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4.7 Timestampoutput

Timestampoutputcanbeenabledordisabled(usingtheSetOutputSettings message).Thetimestamp

isalwayslastinthedatafieldoftheMTDatamessage.

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Currently, there is one option for the timestamp output, the sample counter which is a 16 bit counter

increasingwith1witheachMTDatamessagesent.Afterreaching(2^16)‐1=65535thesamplecounterwill

wraptozero(0).

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4.8 TestandCalibrationCertificate

EachMTiandMTxisaccompaniedbyanindividualTestandCalibrationCertificate.Thiscertificatestatesthe

calibration values determined during the calibration of the MTi and MTx in Xsens’ calibration facilities. The

valuesareexplainedhereinshort:

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The“Specifications

”chaptercontainsthefullrangesandbandwidthsofthephysicalsensorsinside.

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The“Basictestresults

”describesthenoiseofthe3sensortypesanditcontainsresidualsinorientation.

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Noise Thenoiseontheindividualsensorsignals

Staticaccuracyresidual Theresidualcalibrationerrorforstaticorientationsatroomtemperature

Temperatureresidual The residual calibration error for static orientations over the temperature

range

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“Calibration data

” are the values that describe the conversion from the physical phenomenon to a digital

outputinanorthogonalcoordinatesystem:

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Gains(bits):Gains(orscalefactor)describetherelationbetweenthedigitalreadinginbitsandthemeasured

physicalsignal.

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Offsets(bits):Digitalreadinginbitsofthesensornophysicalsignalismeasured.

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Alignmentmatrix:Non‐orthogonalityofthesensortriade.Thisincludesnon‐orthogonalityintheorientation



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Theresolutionofthesensorsignalsarealwayslimitedbythenoiseinthesensorsignal,notbytheaccuracy

or resolution of the analog to digial converter. Exceptions are the temperature and static pressure sensor

wherequantizationcanbesignificant.

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DAGE-MTI Excel Series Manuel d'utilisateur Page 27

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