›› 2014, Vol. 34 ›› Issue (4): 24-.doi: 10.3780/j.issn.1000.758X.2014.04.004

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SelectiononImprovedFuzzyCMeansAlgorithmofBeidouTripleFrequencyCombinationObservations

 HE  Wei, TAO  Ting-Ye, WANG  Zhi-Ping   

  • Online:2014-08-25 Published:2014-08-25

Abstract: ThecombinedobservationsanderrorsofBeidousatellitenavigationsystembasedontribanddoubledifferencewerediscussed.AnincrementaldistancecorrectionbasedfuzzyCMeansalgorithmwasproposedtoovercomethedisadvantageoftheclusteringmethod,whichpreviouslyusedtostudythecombinationobservationsofGPStribanddata.Thecorrectclassificationcanbegotbyadjustingthefactorandclustercenterofthesampledistancefromthecentereffectivelytoobtainareasonabledegreeofmembershipandavoiddeterminingthenumberofclustersofhumanirrationality.Thedistancebasedclusteringvalidityindexcorrectionwascreated,andtheoptimalnumberofclusterscanbeautomaticallyobtainedbyintroducinganincrementalwhenthedatawasincreasedbasedontheoriginaldataset.Thenewdatawereclassifiedbasedontheoriginaldatasetwithoutrecalculation.Thefeasibilityandreliabilitywereprovedbythematrixtransformationmethodandtypicalexamples.

Key words: FuzzyCMeans, Distancecorrection, Tribandcombination, Indicatorsofeffectiveness, Beidousatellitenavigationsystem