基于卡尔曼滤波器的gps近实时定位时钟估计毕业论文外文翻译-精品

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1、中文5030字出处： GPSsolutions,2009,13(3):173-182外文原文Kalman-filter-basedGPSclockestimationfornearreal-timepositioningAndre´Hauschild.OliverMontenbruckAbstract：Inthisarticle,analgorithmforclockoffsetestimationoftheGPSsatellitesispresented.ThealgorithmisbasedonaKalman-filterandprocessesundifferencedcodea

2、ndcarrier-phasemeasurementsofaglobaltrackingnetwork.Theclockoffsetanddriftofthesatelliteclocksareestimatedalongwithtrackingstationclockoffsets,troposphericzenithpathdelayandcarrier-phaseambiguities.Thearticleprovidesabriefoverviewofalreadyexistingnearreal-timeandreal-timeclockproducts.Thefiltera

3、lgorithmanddataprocessingschemeispresented.Finally,theaccuracyoftheorbitandclockproductisassessedwithapreciseorbitdeterminationoftheMetOpsatelliteandcomparedtoresultsgainedwithotherreal-timeproducts.Keyword:ClockestimationPreciseorbitdeterminationReal-timeKalmanfilterIntroductionAgrowingnumberof

4、nearreal-timeprecisepointpositioning(PPP)applicationsraisetheneedforpreciseGPSorbitandclockproductswithshortlatency.Oneoftheseapplicationsisthepreciseorbitdetermination(POD)ofremote-sensingsatellites,whichistobeperformedshortlyafteragroundstationpass.Theobservationsofthesatellite’sGPSreceiverare

5、availableimmediatelyafterthedownloadtothegroundstation.Forprocessingthesedata,theuserrequirespreciseorbitandclockdataforthecompleteGPSconstellation.TherubidiumandcesiumatomicstandardsoftheGPSsatellitesaresubjecttoclocknoiseandfrequencyvariations,whichcanoriginatefromavarietyofeffectsandarehardto

6、forecast.Predictionsofclockoffsetanddrift,whichareprovidedforexampleinthepredictedpartoftheultra-rapidorbitsprovidedbyIGSorthebroadcastephemerides,willdeviatequicklyfromthetruevaluesbyseveraldecimetersorevenmeters.Thus,theseorbit/clock-productsbecomeunusableforPPPapplications,whereacarrier-phase

7、basedpositioningaccuracydowntocentimeterlevelisdesired.Thesolutiontothisproblemistheuseofclockoffsets,whichhavebeenestimatedfromGPSmeasurementsoriginatingfromanetworkofsensorstations.Currently,onlyalimitedsetofprovidersforpr