简介：Inrecentyears,radiooccultation(RO)technologymakinguseofglobalpositioningsystem(GPS)signalshasbeenexploitedtoobtainprofilesofatmosphericparametersintheneutralatmosphere.Inthispaper,theROrefractivityprofilesobtainedfromtheConstellationObservingSystemforMeteorology,IonosphereandClimate(COSMIC)missionarestatisticallycomparedwiththeobservationsof38radiosondestationsprovidedbytheAustralianBureauofMeteorologyduringtheperiodfrom15July2006through15July2007.Di?erentcollocationcriteriaarecomparedatfirst,andCOSMICROsoundingsthatoccurwithin3hoursand300kmofradiosondemeasurementsareusedforthefinalstatisticalcomparison.TheoverallresultsshowthattheagreementsbetweentheCOSMICrefractivityprofilesandtheradiosondesoundingsfromthe38stationsareverygoodat0–30kmaltitude,withmeanabsoluterelativerefractivitydeviationsoflessthan0.5%.Latitudinalcomparisonsindicatethattherearenegativerefractivitydeviationsinthelowertroposphereoverthelowlatitudeandmiddlelatituderegionsandlargestandarddeviationsexistinthelowertroposphereoflowlatituderegions,whichcanreachupto～6%.ThecomparisonsofCOSMICROrefractivityprofilesandradiosondeobservationsfor3polarstationsinfourdifferentseasonsindicatethattheaccuracyofGPSROprofilesisbetterintheAustralsummerandautumnthanintheAustralspringandwinterduringtheyearfromSeptember2006toAugust2007.