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1、lSummarizingTheGlobalPositioningSystemAbstract:GlobalPositioningSystemisbasedonthebackgroundoftheUnitedStatesDepartmentofDefense.ItisdesignedinvesteddevelopedoperatedbytheUnitedStatesDepartmentofDefenseGPSisasatellitebas

2、edpositioningtimetransferingGPSpositioningfunctionhasawiderangeofapplicationsinthemodernmeasurementamemodernbuilding.GPSRTKtechnologyisalsowidelyusedinmodernizationbuildingnowGPShasalsobeenshowntobeanimptantciviliancommu

3、nitiesofinterestincreasinglywiderangeofapplicated.Keywd:GPSLocating，RTK，Layout，Survey1.BackgroundThe50sthefmerU.S.S.RhasnotlaunchedhumanitiesfirstartificialearthsatellitetheAmericanscientistsinalongitstrackresearchinhadd

4、iscoveredtheDopplershiftphenomenonhasfacilitatedDopplersatellitenavigationpositioningsystemcompletingusingthisprinciplehasobtainedtheenmoussuccessinthemilitarytheciviaspectwasinanavigationlocalizationhistyleapourcountryo

5、ncehasalsointroducedmanyDopplerreceiverappliedtotheislassociationmeasuredtheEarthexpledsoontheappliedtotheislassociationmeasuredtheEarthexpledsoonthedomain.ButbecauseDopplersatellitebithighlylowsignalcarrierfrequencylowt

6、hetrackprecisionenhanceswithdifficultycausesthepointingaccuracylowlysatisfiesthegeodeticsurveytheprojectsurveyrequestismeimpossibletouseintheastronomyEarthdynamicsresearch.Indertoenhancethesatellitepositioningtheprecisio

7、nUSstartedfrom1973topreparefconstructionglobalpositioningsystemGPS(GlobalPositioningSystem).Afterhasenteredtheplanproofthesystemteststagestartedin1989tolaunchtheofficialwksatellitecompletelycompletedin1994investmentuse.T

8、heGPSsystemspaceartiallyiscomposedbytwentyonesatellitesevenlydistributesinsixbitthegroundlevelis20000Kilometerstheinclinationofbitis55theflatheartrateapproximatelyis0theweekcontractis12hoursthesatellitetotheearthlaunchin

9、gtwowavebsintelligencesignalstheintelligencesignalfrequencyrespectivelyis1575.442megacyclespersecond(theL2waveb)onthesatellitehasinstalledtheprecisionverylfreeonlineobtainproductsoonobservationdataprecisestarexperiencefr

10、ominter.TheGPSsystemrealtimenavigationpointingisveryhighUShasimplementedthesocalledSApolicyin1992namelyreducesthebroadcaststartoundergothestarpositionprecisionreducesthestarclocktochangethepositivenumbertheprecisionaddso

11、nthehighfrequencyvibrationtothesatellitedatumfrequency(tocausefalsedistancemeasuringaccuracytoreducewithphase)latterhasimplementedtheASpolicysoonPyardchangeisYyardnamelyfurtherlimitstotheprecisefalsedistancesurveybutAmer

12、icanmilitaryspecialpermissionusernotthesepolicesinfluencesbutUSindertoobtainthebiggercommercialinterestthesepolicyendsarecancelled.2.GPSlocalizationprincipalTheGPSreceivermayreceiveuseinthetimeserviceaccuratelytothenanos

13、econdleveltimeinfmationwilluseintofecastthefuturefseveralmonthsthesatellitetolocatethesummarypositionfecaststarexperienceUsesincalculateswhenthelocalizationtoneedthesatellitecodinatesthebroadcaststarexperiencetheprecisio

14、nis(eachsatelliteisdifferentseveralmetertoseveraldozensmeters~changesasnecessary)AswellasGPSsysteminfmationlikesatelliteconditionsoon.TheGPSreceivermayobtainthesatellitesigntothecodetothereceiverdistancebecauseincludesth

15、ereceiversatelliteclocktheerrtheatmospherepropagatederrtherefeiscalledthefalsedistance.ThefalsedistanceobtainswhichtotheOAcodeiscalledtheUAcodefalsedistancetheprecisionapproximatelyisabout20metersobtainsthefalsedistancet

16、oPyardtobecalledPyardfalsedistancetheprecisionapproximatelyisabout2meters.TheGPSreceivertothesatellitesignalwhichreceivescarriesonthedecodingusesothertechnologieswillmodulateafterthecarriertheinfmationremoveswillbeallowe

17、dtorestethecarrier.StrictsaysthecarrierphaseshouldbecalledthecarrierbeatfrequencyphaseitisreceivesproducestheDopplershiftinfluencesatellitesignalcarrierphasereceiverthismachinevibrationdifferenceofthesignalphase.Generall

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