Thedifference-ratiorelationsareintroducedtoseparatetidalconstituentsthatarealiasedduetothesamplingintervalandsamplingspanoftheTOPEX/POSEIDONaltimeter.ItisfoundthatsometidalconstituentssuchasK1andSSA,thoughaliasedatalongtrackpoints,arenotaliasedatcrossoverpointsbecausethedataatcrossoverpointsaredoublethoseatalongtrackpoints.Sotheharmonicanalysismethodcanbeemployeddirectlyfortheanalysisoftimeseriesatcrossoverpoints.Thenthedifference-ratiorelationsfromcrossoverpointsareintroducedtoanalyzethetimeseriesatalongtrackpoints.TheTOPEX/POSEIDONdataintheNorthwestPacificareanalyzedwiththismethod.Theresultsfromthismethodagreewellwithtidalconstantsfromtidalgauges.