Kongsberg EM 710 - Page 13

Inputdatagrams
InadditiontopositiondatafromtheGGAorGGKdatagrams,speedandcourse
overgroundfromNMEAVTGdatagramsmayalsobecopiedintotheposition
outputdatagram.Thesevaluesmaybeusefulinlteringofthepositioningduring
postprocessing.IfaVTGdatagramdoesnotfollowtheGGAorGGKdatagramthe
courseandspeedeldsoftheoutputdatagramswillbesettotheirinvalidvalues.
AsanalternativetoGGA,theSIMRAD90formatpositiondatagrammaybeused.
TheSIMRAD90formatisintendedtobetheformatofchoicewhenthepositioning
systemisnotastand-aloneGPSreceiversupplyingGGAorGGKformatdatagrams.
TheSIMRAD90formatcaninadditiontogloballongitudeandlatitudecoordinatesalso
beusedforNorthingandEastingtypeprojectioncoordinates(e.g.UTM).
TocaterforapplicationswheretheEM2000orEM3000SonarHeadismountedona
subseavehicle,theoriginalSIMRAD90formathasbeenexpandedtoallowinclusion
ofthedepthofthevehicleinadditiontoitshorizontalpositioninlongitude/latitude
orNorthing/Eastingcoordinates.
SISsupportsloggingofalldatafromaJavadGPSreceiverdirectlyattachedtothe
serialportontheHWSPC.
TheJavadGPSreceiveroutputsbinarydatainadditiontotheNMEAdatagrams.The
binarycanbeusedbythirdpartysoftware(likeTerratec)tocomputemoreaccurate
positionsusingpostprocessingtools.TheJavaddatalesarestoredinaseparatefolder
andkeptseparatefromtheotherrawdatatoeasethepostprocessingofthedata.The
operatorchoosesthisdirectoryintheruntimeparametersinSIS.
ATrimbleGPSreceivercanalsobeattachedtotheseriallineoftheHWSPC.Thisis
usedforspecialpurposeslikelandsurveying.
850-160692/S
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