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1、衛(wèi)星系統(tǒng)分類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
