›› 2017, Vol. 37 ›› Issue (6): 82-.doi: 10.16708/j.cnki.1000-758X.2017.0060

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PreliminaryperformanceanalysisofthefirstbackupsatelliteofBeiDouNavigationSatelliteSystem

 LIU  Xiao, ZHAO  He, ZHAO  Long   

  1. 1SchoolofAutomationScienceandElectricalEngineering,BeihangUniversity,Beijing100191,China
    2BeijingSatelliteNavigationCenter,Beijing100094,China
  • Received:2017-02-17 Revised:2017-03-06 Online:2017-12-25 Published:2017-06-29

Abstract: TofurtherenhancethecapabilityofBeiDouNavigationSatelliteSystem(BDS)to providecontinuousandefficientservice,thefirstbackupsatelliteI6waslaunchedinMarch2016.ThedifferencesandsimilaritiesbetweenI6andotherIGSOsatelliteswereanalyzed,fromtheperspectiveofsatelliteclockprediction,orbitdeterminationaccuracyandpseudorangevariation.ThecontributionofI6toBDSwasevaluatedbyPDOPvaluesandgridavailability.Thesatelliteclockmeasurementsobtainedbytwowaysatellitetimefrequencytransfer(TWSTFT)systemwereusedtoevaluateclockpredictionerrorofI6.Theresultsshowthatfor5hourprediction,clockerrorofI6is232nsintermsofrootmeansquare(RMS)andtheextrapolatedonehourpredictionerroris073ns(RMS).ComparedwithotherIGSOsatellitesclock,theerrorforecastlevelofI6isequivalent.TheorbitdeterminationaccuracyofI6optimizedbytheattitudecontrolmethodisnotdegradedobviouslycomparedwiththeI3ofBDSwhentheSunisclosetotheI6′sorbitplane,whichovercomesthedecreaseoftheorbitaccuracyoftheexistingBDSsatellitesduringtheshadow.ThepseudorangevariationoftheI6satellitewasanalyzedusingthedatacollectedbythelargeapertureparabolicantenna.Theresultsshowthatthepeaktopeakdifferenceofthepseudorangevariationisabout1minthesingleobservationarcofI6satellite.ItisconsistentwithotherIGSOsatellites.I6isinthehotstandbymodeofoperation,providingserviceswiththeoriginalBeiDousatellitesafterMay2016,changingtheBDSconstellationcomposition.TheresultsofPDOPsimulationshowthatthemaximumPDOPofKaShiisdecreasedfrom1282to726,andthepercentageofPDOPgreaterthan6isdecreasedfrom2911%to1721%.TheresultsshowthatI6increasestheavailabilityofsixionosphericgridpoints.

Key words: BeiDouNavigationSatelliteSystem, backupsatellite, orbitdetermination, pseudorangevariation;ionosphericgrid