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IGS连续运行参考站高程时间序列功率谱分析.docx

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IGS连续运行参考站高程时间序列功率谱分析 Introduction Inrecentyears,GlobalNavigationSatelliteSystems(GNSS)havebeenwidelyusedinvariousfields,includingpositioning,navigation,andremotesensing.Withtheincreasingdemandforhigh-precisionGNSSapplications,theaccuracyandstabilityofGNSSmeasurementshavebecomeacriticalissue.OneofthemostsignificantchallengesinGNSSishowtoestimateandcorrecttheionosphericdelay,whichisoneofthemostsignificanterrorsourcesinGNSSmeasurements.Therearevarioustechniquestoestimatetheionosphericdelay,includingusingdual-frequencyGNSSreceivers,creatingionosphericmodels,andimplementingreal-timecorrections.However,mostoftheseapproachesrelyontheavailabilityofareferencestationnetwork,whichrequiresacontinuousoperationofGNSSreferencestations. TheInternationalGNSSService(IGS)isoneofthemostwidelyusedGNSSreferencestationnetworksglobally.TheIGSisacollaborativeeffortofnumerousagenciesandinstitutionsthatprovideglobalhigh-precisionorbitandclockproducts,ionosphericcorrections,andotherrelatedservices.However,thelong-termstabilityandaccuracyoftheIGSproductsdependonthequalityofthereferencestationmeasurements.Therefore,thecontinuousoperationofIGSstationsisessentialforthesuccessandeffectivenessoftheIGS. Thetime-seriesanalysisofGNSSreferencestationmeasurementsisoneofthecriticaltechniquesforunderstandingthelong-termstabilityandperformanceofGNSSnetworks.Inthispaper,weinvestigatethepowerspectraldensity(PSD)analysisofthetime-seriesofIGSreferencestationheights.ByanalyzingthePSDofthereferencestationheights,wecanunderstandthefrequency-dependenceoftheheightvariationsandcharacterizethenoisesourcesintheGNSSmeasurements. Methodology Weusedthedailytime-seriesoftheIGSreferencestationheightsfrom2000to2019,providedbytheIGSAnalysisCenterCoordinator(ACC)attheUniversityofBern.Weselectedasubsetof20stationsthathavecontinuousmeasurementsduringthisperiod.Thetimeserieswereprocessedusingtheprecisepointpositioning(PPP)techniquetoestimatethestationheights.ThePPPtechniqueisasinglereceivertechniquethatinvolvesusingpreciseorbita