GPS英文论文翻译

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1、GPSSolut(2009)13:173–182DOI10.1007/s10291-008-0110-3Kalman-filter-basedGPSclockestimationfornearreal-timepositioningAndre´Hauschild.OliverMontenbruckAbstractInthisarticle,analgorithmforclockoffsetestimationoftheGPSsatellitesispresented.ThealgorithmisbasedonaKalman-filterandprocessesundiff

2、erencedcodeandcarrier-phasemeasurementsofaglobaltrackingnetwork.Theclockoffsetanddriftofthesatelliteclocksareestimatedalongwithtrackingstationclockoffsets,troposphericzenithpathdelayandcarrier-phaseambiguities.Thearticleprovidesabriefoverviewofalreadyexistingnearreal-timeandreal-timeclock

3、products.Thefilteralgorithmanddataprocessingschemeispresented.Finally,theaccuracyoftheorbitandclockproductisassessedwithapreciseorbitdeterminationoftheMetOpsatelliteandcomparedtoresultsgainedwithotherreal-timeproducts.KeywordClockestimationPreciseorbitdeterminationReal-timeKalmanfilterInt

4、roductionAgrowingnumberofnearreal-timeprecisepointpositioning(PPP)applicationsraisetheneedforpreciseGPSorbitandclockproductswithshortlatency.Oneoftheseapplicationsisthepreciseorbitdetermination(POD)ofremote-sensingsatellites,whichistobeperformedshortlyafteragroundstationpass.Theobservatio

5、nsofthesatellite’sGPSreceiverareavailableimmediatelyafterthedownloadtothegroundstation.Forprocessingthesedata,theuserrequirespreciseorbitandclockdataforthecompleteGPSconstellation.TherubidiumandcesiumatomicstandardsoftheGPSsatellitesaresubjecttoclocknoiseandfrequencyvariations,whichcanori

6、ginatefromavarietyofeffectsandarehardtoforecast.Predictionsofclockoffsetanddrift,whichareprovidedforexampleinthepredictedpartoftheultra-rapidorbitsprovidedbyIGSorthebroadcastephemerides,willdeviatequicklyfromthetruevaluesbyseveraldecimetersorevenmeters.Thus,theseorbit/clock-productsbecome

7、unusableforPPPapplications,whereacarrier-phasebasedpositioningaccuracydowntocentimeterlevelisdesired.Thesolutiontothisproblemistheuseofclockoffsets,whichhavebeenestimatedfromGPSmeasurementsoriginatingfromanetworkofsensorstations.Currently,onlyalimitedsetofprovidersf