Abstract: AnovelalgorithmcalledKernelfuzzyC-meansimputation(KFCM-I)wasproposedfortheincompletedataofsatellitereactionwheel.ThecentersandradiusoftheknownfaultsampleswereclusteredbytheKFCM,andtheincompletedatapointswerereplacedbythechosendatapointsforkeepingthesampledatacompletely,whichwerechosenfromtheknownfaultdatabythesimilaritycalculationandwerethemostsimilartotheincompletedatapoint.Thenthesimilaritywasadoptedtodiagnosethetestsampledata.Twoscenarioswereconsidered,onewasthatallthefeaturedatamissedatthesametime,andtheotherwasthateachdatamissedattherandomtime,butthelocationsofallthemissingdatapointswererandom.Comparedwithdirectlyexcludingtheoutlierormissingdatapointsinengineering,whenthemissingdataislessthan13%ofthetotaltestdata,theaccuracyofKFCM-Iishigherthan90%,whilethemissingdataisbetween13%~20%,theaccuracyalsoachievesat80%.TheKFCM-Ialgorithmismoreaccuracyandhaslowcomputation,whichisanusefulreferencetotheengineering.

Key words: Incompletedata, Imputation, Faultdiagnosis, KFCM-I, Reactionwheel, Satellite