Vertical Protection Level Equations for 英文文献资料

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1、VerticalProtectionLevelEquationsforDualFrequencySBASToddWalter,JuanBlanch,andPerEnge,StanfordUniversityABSTRACTINTRODUCTIONTheL1-onlySatellite-BasedAugmentationSystemTheGlobalPositioningSystem(GPS)isintheprocessof(SBAS)MinimumOperationalPerformanceSt

2、andardsaddingnewcivilsignals[1][2][3].Thesenewcivil(MOPS)weredevelopedlongbeforeanySBASsweresignalsincludeasecondfrequencyinaprotectedcertifiedforoperation.DuringthedevelopmentandAeronauticalRadioNavigationServices(ARNS)bandcertificationoftheWideArea

3、AugmentationSystemthatmaybeusedtoguideaircraft.Theincorporationof(WAAS),itwasdiscoveredthatthezero-meanGaussianthisnewsignalintoSatellite-BasedAugmentationbasisoftheVerticalProtectionLevel(VPL)equationwasSystems(SBAS),suchastheFederalAviationnotstric

4、tlytrueforsomeerrorsources,andverydifficultAdministration’s(FAA)WideAreaAugmentationtosufficientlydemonstrateforothers.TheactualdataSystem(WAAS)[4][5],allowsforgreatlyexpandedcollectedinsupportofsystemperformancedemonstratedserviceandcapabilities.Mos

5、timportantly,thelargestnon-Gaussianbehavior.Further,sourcesofsmallsourceofuncertaintyaffectingtheaccuracyandintegrityuncorrectablebiaseswerediscoveredaftertheoriginalofthesystemcanbedirectlyobservedandeliminatedinMOPSdevelopment.Thesebiasescanarisefr

6、omtheaircraft.Thisallowsforbetterlevelsofservicewithinconsistent,minordifferencesinthesignalstructurefromtheexistingcoverageregionandexpansionofcoverageonesatellitetoanother.Antennabiasesatthesatellite,atbeyondwherethereferencestationnetworkcantheref

7、erencestations,andattheuserareotherpossibleadequatelymonitortheionosphere.sourcesofthesebiases.BecausetheMOPSVPLequationisbaseduponzero-meanGaussianerrorTheadditionofanewfrequencyalsoprovidesancombination,muchadditionalworkwasrequiredtoopportunitytob

8、roadcastanewsetofSBAScorrectionsdemonstratethattheactualerrorscouldbesufficientlythatcantakeadifferentapproachthanwasusedontheprotectedsafely.SomeperformanceislostbecausethelegacyL1correctionsignal.Thus,lessonslearnedfromsystemhastoimplementconservat