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1、卫星系统分类Theclassificationofsatellitemobilecommunicationsystemscanbedividedaccordingtotheirapplication,ortheycanbedividedaccordingtothetechnologytheyemploy.(1)accordingtotheapplicationclassificationItcanbedividedintomaritimesatellitemobilesystem(MMSS),air
2、bornesatellitemobilesystem(AMSS)andlandsatellitemobilesystem(LMSS)・Maritimesatellitemobilesystemismainlyusedforimprovingmaritimerescuework,improvetheefficiencyoftheshiptouseandthemanagementlevel,enhancecommunicationsandwirelesspositioningcapabilityatse
3、a・Theaviationsatellitemobilesystemisusedtoimprovevoiceanddatacommunicationbetweentheaircraftandtheground.Thelandsatmobilesystemismainlyusedtoprovidecommunicationsformovingvehicles・(2)accordingtothetrackclassificationTherearetwotypesoforbitingsatellites
4、・Oneislowormediumhighorbit・Thesatellitesthatoperateonthisorbitaremovingrelativetotheground.Itcanbeusedforshortperiodsofcommunication,andthesatelliteantennasaresmall,andthegroundantennasmustkeeptrackofsatellites・Anothertrackisashighasthirty-sixthousandk
5、ilometersofsynchronousdesignatedorbit,namelyintheequatorialplanecircularorbit,thesatelliteoperationcycleandtheearthrotatesacircleatthesametime,onthegroundtowatchthesatelliteismotionless,fixed-pointsatellitecalledsynchronization.Itischaracterizedbylarge
6、overlays,whichcancoveralmostalloftheearth，ssurfaceareaandcancommunicate24hoursaday.(1)classificationbyfrequencyThesatelliteisdividedinto1-bandsatellites,Kabandsatellitesandsoon.(2)toclassifyaccordingtotheserviceareaWiththerapiddevelopmentofspacetechnol
7、ogy,thenumberofcommunicationssatellitesisincreasing.Thereareglobal,regionalanddomesticcommunicationssatellitesintheservicearea・Globalcommunicationssatellites,asthenameimplies,refertotheglobalcommunicationssatellitesoftheservicearea,whichoftenrequiresal
8、otofsatellitenetworkstoform・Theregionalsatelliteservesonlyonearea.Anddomesticsatellitescopeismorenarrow,limitedtodomesticuse,allkindsofclassificationmethodsarereallywantacertaincharacteristicsofthesatelliteisstronger,sothatpeoplebetterd
