简介:TwomethodsforsmoothingpseudorangeobservablebyCarrierandDopplerarediscussed.ThentheprocedurebasedontheRINEXobservationfilesistestedusingtheAshtechZ-XII3TgeodeticreceiversdrivenbyastableexternalfrequencyatUNSO.Thispaperproposestoadaptthisprocedureforthelinksbetweengeodeticreceivers,inordertotakeadvantageofthePcodesavailableonL1andL2.Thisnewprocedureusesthe30-secondRINEXobservationsfiles,thestandardoftheInternationalGPSService(IGS),andprocessestheionosphere-freecombinationofthecodesP1andP2;thesatellitepositionsarededucedfromtheIGSrapidorbits,availableaftertwodays.