Abstract: Ananalyticalsolarradiationpressure(SRP)modelingmethodfornavigationsatelliteswasproposedtoimprovetheprecisionofpreciseorbitdetermination.ComparedwiththeotherperturbingforcemodelswhichhavemuchlargermagnitudebecauseofSunactivityleadingtochangesoftheSunenergy,satellitesattitudecontrolerror,aswellastheagingofthesatellitesurfacematerial,andasthemajoruncertaintyerrorsourcesaffectingmediumearthorbitsatellites,SRPmodelisthemostdifficulttobeconstructedprecisely.Onthebasisofattitudecontrollawofnavigationsatellite,ananalyticalSRPmodelwasdeveloped,inwhichtheperturbingaccelerationwasexpressedinsatellite′sbodyfixedcoordinatesystem.SimulationresultsofGPSBlockIIRshowthattheSRPmodelworksquitewell.ThecomputationalcostisquiteclosetothatoftheT30andECOMSRPmodel,provingthattheprecisionofSRPmodelmeetstherequirementofprimarySRPstudy.

Key words: Solarradiationpressure, Navigationsatellite, Modeling, Verification