GPS定位-外文翻译

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1、第一篇中英文互译外文原文Recently,accordingtotherequirementsofsomeimportantGPSresearchsubjectsinthefieldsofGeodesy,Geophysics,Space-PhysicsandnavigationinChina,westudiedsystematicallyhowtocorrectingtheeffectsoftheionosphereonGPS,withhigh-precisionandaccuracy.Asthepartsofthema

2、incontributions,theresearchprojectsfocusmainlyonhowtoimproveGPSsurveyingbyreducingionosphericdelayfordual/singlefrequencykinematic/staticusers:highaccuracycorrectionofionosphericdelayforsingle/dualfrequencyGPSusersontheearthandinspace,ChinaWAASionosphericmodeling

3、andthetheoryandmethodofmonitoringofionosphereusingGPS. ThemaincontentsofthisPh.Dpaperconsistoftwoparts:Fisrtpart---theoutlineofresearchbackgroundandthesystematicintroductionandsummarizationofthepreviousresearchresultsofthiswork.Secondpart---themaincontributionand

4、researchresultsofthispaperarefocusedonasfollows:(1)HowtousethemeasurementsofadualfrequencyGPSreceivertodeterminetheionosphericdelaycorrectionmodelforsinglefrequencyGPSofalocalrange;(2)   HowtoseparatetheinstrumentalbiaseswiththeionosphericdelaysinGPSobservation;(

5、3)HowtoestablishalargerangegridionospheremodelandusetheGPSdataofChinesecrustmovementobservationnetworktoinvestigatethechangelawofionosphericTECof Chinaarea;(4)HowtoimprovetheeffectivenessofcorrectingionosphericdelaysforWAAS’susersunderadverseconditions.(5)Howtoes

6、tablishthebasictheoryandthecorrespondingframeworkofmonitoringthestochasticionosphericdisturbanceusingGPS(6)Howtoimprovethemodellingabilityofionosphericdelayaccordingtoitsdiurnal,seasonal,annualvariationsbasedonGPS;(7)Howtomeetthedemandofcorrectingtheionosphericde

7、layof high-precisionorbitdeterminationforlow-earthsatelliteusingasinglefrequencyGPSreceiver1 Extracting(local)ionosphericinformationfromGPSdatawithhigh-precisionThefactorsaresystematicallydescribedandanalyzedwhichlimittheprecisionofusingGPSdatatoextractionospheri

8、cdelays.TheprecisionofdeterminingionosphericdelayusingGPSisimprovedbasedonthefurtherresearchoftherelatedmodelsandmethods.Themainachievementsofthisworkincludeth