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1、外文翻译原文SummarizingTheGlobalPositioningSystemAbstract:GlobalPositioningSystemisbasedonthebackgroundoftheUnitedStatesDepartmentofDefense.Itisdesigne,invested,developed,andoperatedbytheUnitedStatesDepartmentofDefense,GPSisasatellite-basedpositioningandtimetransfering,GPSpositioningfunctionhasawideran
2、geofapplicationsinthemodernmeasurementandamoremodernbuilding.GPS-RTKtechnologyisalsowidelyusedinmodernizationbuilding,andnowGPShasalsobeenshowntobeanimportantciviliancommunitiesofinterest,andincreasinglywiderangeofapplicated.Keyword:GPS,Locating，RTK，Layout，Survey1.BackgroundThe50s,theformerU.S.S.
3、Rhasnotlaunchedhumanitiesfirstartificialearthsatellite,theAmericanscientistsinalongitstrackresearchin,haddiscoveredtheDopplershiftphenomenon,andhasfacilitatedDopplersatellitenavigationpositioningsystemcompletingusingthisprinciple,hasobtainedtheenormoussuccessinthemilitaryandthecivilaspect,wasinan
4、avigationlocalizationhistoryleap,ourcountryoncehasalsointroducedmanyDopplerreceiver,appliedtotheislandassociationmeasured,theEarthexploredandsoontheappliedtotheislandassociationmeasured,theEarthexploredandsoonthedomain.ButbecauseDopplersatelliteorbithighlylow,signal-carrierfrequencylow,thetrackpr
5、ecisionenhanceswithdifficulty,causesthepointingaccuracylowly,satisfiesthegeodeticsurveyortheprojectsurveyrequest,ismoreimpossibletouseintheastronomyEarthdynamicsresearch.Inordertoenhancethesatellitepositioningtheprecision,USstartedfrom1973toprepareforconstructionglobalpositioningsystemGPS(GlobalP
6、ositioningSystem).Afterhasenteredtheplanproof,thesystemteststage,startedin1989tolaunchtheofficialworksatellite,andcompletelycompletedin1994,investmentuse.TheGPSsystemspaceiscomposedbytwentyonesatellites,evenlydistributesinsixorbit,thegroundlevelis20,000Kilometers,theinclinationoforbitis55,theflat
7、heartrateapproximatelyis0,theweekcontractis12hours,thesatellitetotheearthlaunchingtwowavebandsintelligencesignals,theintelligencesignalfrequencyrespectivelyis1575.442megacyclespersecond(theL2waveband),onthesatellitehas
