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GALILEO系统完备性指标SISMA的仿真分析(英文).docx

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GALILEO系统完备性指标SISMA的仿真分析(英文) SimulationAnalysisoftheCompletenessIndicatorSISMAoftheGALILEOSystem Introduction TheGlobalNavigationSatelliteSystem(GNSS)hasbecomeanintegralpartofourdailylives,providingaccuratepositioningandtimingservicestousersworldwide.TheGALILEOsystemisoneofthemajorGNSSsystemsdevelopedtocomplementandcompetewiththeexistingGPSandGLONASSsystems.Asanewsystem,itisessentialtoassessitscompletenessandreliability,whichisvitalinanysafety-criticalapplication. Inthispaper,wewilldiscussthecompletenessindicatorSISMAoftheGALILEOsystemandanalyzeitsperformancethroughsimulation.TheSISMAisaquantitativemeasureofthecompletenessofaGNSSsystem,whichcanbeusedtoassessthesystem'sabilitytoprovidepositioningandtimingservicesindifferentscenarios.WewilldiscusstheconceptofSISMA,itscalculationmethod,andthesimulationresultsobtainedthroughdifferentscenarios. ConceptofSISMA ThecompletenessindicatorSISMAisbasedontheconceptofdilutionofprecision(DOP),whichiscommonlyusedinGNSSsystemstoassessthequalityofthepositioningsolution.TheDOPisameasureofhowthepositioningaccuracyisimpactedbythegeometryofthesatelliteconstellation.Ingeneral,alowerDOPvalueindicatesabetterpositioningaccuracy. TheSISMAtakesintoaccounttheDOPvaluesoftheGALILEOsystemindifferentscenariostoprovideameasureofthesystem'scompleteness.Thecompletenessreferstothesystem'sabilitytoprovidepositioningandtimingservicesindifferentenvironments,suchasurbancanyons,openareas,forests,andsoon.TheSISMAisameasureofhowmanyscenariostheGALILEOsystemcanprovidereliablepositioningandtimingservices. CalculationMethodofSISMA TheSISMAcanbecalculatedbyanalyzingtheDOPvaluesoftheGALILEOsystemindifferentscenarios.TheDOPvaluescanbeobtainedthroughsimulationormeasurementdata.Inthispaper,wewillfocusonsimulationanalysis. ThesimulationcanbedoneusingaGNSSsimulator,whichgeneratesrealisticsatellitesignalswithuser-definedparametersandscenarios.Thesimulatorcansimulatetheuser'sreceiverandcalculatetheDOPvaluesbasedonthegeneratedsatellitesignals.TheDOPvaluescanbecalculatedfo