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1、外文翻译原文SummarizingTheGlobalPositioningSystemAbstract:GlobalPositioningSystemisbasedonthebackgroundoftheUnitedStatesDepartmentofDefense.Itisdesigne,invested,developed,andoperatedbytheUnitedStatesDepartmentofDefense,GPSisasatellite-basedpositioningandtimetransfering,GPSp
2、ositioningfunctionhasawiderangeofapplicationsinthemodernmeasurementandamoremodernbuilding.GPS-RTKtechnologyisalsowidelyusedinmodernizationbuilding,andnowGPShasalsobeenshowntobeanimportantciviliancommunitiesofinterest,andincreasinglywiderangeofapplicated.Keyword:GPS,Lo
3、cating，RTK，Layout，Survey1.BackgroundThe50s,theformerU.S.S.Rhasnotlaunchedhumanitiesfirstartificialearthsatellite,theAmericanscientistsinalongitstrackresearchin,haddiscoveredtheDopplershiftphenomenon,andhasfacilitatedDopplersatellitenavigationpositioningsystemcompletin
4、gusingthisprinciple,hasobtainedtheenormoussuccessinthemilitaryandthecivilaspect,wasinanavigationlocalizationhistoryleap,ourcountryoncehasalsointroducedmanyDopplerreceiver,appliedtotheislandassociationmeasured,theEarthexploredandsoontheappliedtotheislandassociationmeas
5、ured,theEarthexploredandsoonthedomain.ButbecauseDopplersatelliteorbithighlylow,signal-carrierfrequencylow,thetrackprecisionenhanceswithdifficulty,causesthepointingaccuracylowly,satisfiesthegeodeticsurveyortheprojectsurveyrequest,ismoreimpossibletouseintheastronomyEart
6、hdynamicsresearch.Inordertoenhancethesatellitepositioningtheprecision,USstartedfrom1973toprepareforconstructionglobalpositioningsystemGPS(GlobalPositioningSystem).Afterhasenteredtheplanproof,thesystemteststage,startedin1989tolaunchtheofficialworksatellite,andcompletel
7、ycompletedin1994,investmentuse.TheGPSsystemspaceiscomposedbytwentyonesatellites,evenlydistributesinsixorbit,thegroundlevelis20,000Kilometers,theinclinationoforbitis55,theflatheartrateapproximatelyis0,theweekcontractis12hours,thesatellitetotheearthlaunchingtwowavebands
8、intelligencesignals,theintelligencesignalfrequencyrespectivelyis1575.442megacyclespersecond(theL2waveband),onthesatellitehas
