1、第一篇第一篇中英文互譯中英文互譯外文原文外文原文RecentlyaccdingtotherequirementsofsomeimptantGPSresearchsubjectsinthefieldsofGeodesyGeophysicsSpacePhysicsnavigationinChinawestudiedsystematicallyhowtocrectingtheeffectsoftheionosphereonGPSwithhig

2、hprecisionaccuracy.AsthepartsofthemaincontributionstheresearchprojectsfocusmainlyonhowtoimproveGPSsurveyingbyreducingionosphericdelayfdualsinglefrequencykinematicstaticusers:highaccuracycrectionofionosphericdelayfsingled

3、ualfrequencyGPSusersontheearthinspaceChinaWAASionosphericmodelingthetheymethodofmonitingofionosphereusingGPS.ThemaincontentsofthisPh.Dpaperconsistoftwoparts:Fisrtparttheoutlineofresearchbackgroundthesystematicintroductio

4、nsummarizationofthepreviousresearchresultsofthiswk.Secondpartthemaincontributionresearchresultsofthispaperarefocusedonasfollows:(1)HowtousethemeasurementsofadualfrequencyGPSreceivertodeterminetheionosphericdelaycrectionm

5、odelfsinglefrequencyGPSofalocalrange(2)HowtoseparatetheinstrumentalbiaseswiththeionosphericdelaysinGPSobservation(3)HowtoestablishalargerangegridionospheremodelusetheGPSdataofChinesecrustmovementobservationwktoinvestigat

6、ethechangelawofionosphericTECofChinaarea(4)HowtoimprovetheeffectivenessofcrectingionosphericdelaysfWAAS’susersunderadverseconditions.(5)Howtoestablishthebasictheythecrespondingframewkofmonitingthestochasticionosphericdis

7、turbanceusingGPS(6)Howtoimprovethemodellingabilityofionosphericdelayaccdingtoitsthatbyusingaveragingofnoisewithphasesmoothedcodeobservation，theeffectofnoiseonseparatingIBfromIONcanbeefficientlyreducedsatellitebiasplusrec

8、eiverbiasarerelativelystablemaybeusedtopredicttheIBsofthenextsessioneventhatofthenextseveraldays.(4)AnewalgithmaboutstaticrealtimedeterminationofionosphericdelayispresentedonthebasisofthepredictedvaluesofIBthetechniqueof

9、realtimeaveragingofnoiseweightedadjustmentofdualPcodecarrierphasemeasurements.ThepreliminaryresultsshowthatthenewmethodwhichisbypostprocessingphasesmoothedcodedatatocalculatetheIBthenwiththemtopredicttocrecttheIBofdatane

10、ededtoremoveitseffectsinrealtimeinthenextobservationperiodshasrelativelybetteraccuracyeffectivenessinestimatingionosphericdelay.Itisveryobviousthattheschemecanrelativelydecreasethenumberofunknownparameterscanefficientlyr

11、educethemainnegativeeffectfrominstrumentalbiascanbeeasilyusedtodirectlypreciselydetermineionosphericdelaywithdualfrequencyGPSdata.HencethemethodmaybeconsideredasanavailableschemetodetermineionosphericdelaysfWAASmanyother

12、largerangeGPSapplicationsystems.2Amethodofconstructinglargerange(regionalglobal)highprecisiongridionosphericmodel─—theDifferentAreafDifferentStations(DADS)itsapplicationinChinaBasedonthesystematicfurtherresearchoftheprin

13、ciplemethodsofestablishinggridionosphericmodel(GIM)anewmethodofestablishingaGIMDifferentAreasfDifferentStations(DADS)isinvestigatedwhichisadvantageousfconsideringthelocalactersofionosphereavoidingtheeffectsofthegeometric

14、alconstructionofGPSreferencewkonestimatingtheexternalprecisionoftheGIMimprovingtheprecisionofcalculatingmodelparameters.Theaboveresultsareusedtomakeapreliminaryestimationofthelatentprecisionthatcanbeobtainedbyestablishin