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1、GEOPHYSICALRESEARCHLETTERS,VOL.31,L22608,doi:10.1029/2004GL021621,2004Modifiedsiderealfiltering:Implicationsforhigh-rateGPSpositioningKyuhongChoi,AndriaBilich,KristineM.Larson,andPeninaAxelradDepartmentofAerospaceEngineeringSciences,UniversityofColorado,Boulder,Colorado,U
2、SAReceived27September2004;accepted28October2004;published30November2004.[1]High-rate(1-Hz)GlobalPositioningSystem(GPS)ofthesatellites,andtheabilitytomodelerrorsassociateddataarebeginningtobeusedforavarietyofgeophysicalwithorbits,satelliteandreceiverclocks,atmosphericmonit
3、oringpurposes,includingseismology.Improvingthedelays,antennaeffects,andmultipath.ItwasnotedbyBockprecisionofhigh-rateGPSpositionestimateswillincrease[1991]andGenrichandBock[1992]thatsincesomeofthevalueofthese1-HzGPSmonitoringsystems.Onetheseerrorsarerelatedtosatellite-rec
4、eivergeometry,onetechniquethathasbeenusedtoimprovehigh-rateGPScouldtakeadvantageofthefactthattheGPSsatelliteperiodpositioningtakesadvantageofthegroundtrackrepeatisdesignedtobeexactlyhalfasiderealdaytomitigatetheseperiodofthesatellites.ThisstudyinvestigatestheGPSerrors.For
5、areceiverontheEarth,thismeansthatsatellitesorbitalrepeatperiodanddeterminesthatitvariesforeachvisibleintheskytodayshouldbevisibleintheexactsamesatelliteanddifferssignificantlyfromthegenerallyassumedlocation23h56m4s(thesiderealday)later.siderealperiod.Orbitrepeatperiodsare
6、calculatedand[4]Thesiderealfilteringconcepthastwostepsandusedtofilter1-HzGPSpositionestimates.Usingtheimplementationrequiresdatafromtwoormoredays.First,calculatedorbitrepeatperiodsignificantlyreduceslow1-Hzpositionsareestimatedonday1,assumingthatthefrequency(0.001–0.04Hz)
7、errorsin1-HzGPSpositiongroundhasnotmoved.Theseday1positionsarelow-passestimates.INDEXTERMS:1242GeodesyandGravity:filteredtoremovehigh-frequencynoiseunrelatedtotheSeismicdeformations(7205);1241GeodesyandGravity:satellite-receivergeometry,shiftedbythesiderealperiodSatellite
8、orbits;1294GeodesyandGravity:Instrumentsand(23h56m4s)andsubtractedfromtheestimatedpositionstechn
