C05-Satellite_Systems

C05-Satellite_Systems - Prof. Dr.-Ing. JochenSchiller,

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Unformatted text preview: Prof. Dr.-Ing. JochenSchiller, http://www.jochenschiller.de/ MC SS02 5.1 Mobile Communications Chapter 5: Satellite Systems History Basics Localization Handover Routing Systems Prof. Dr.-Ing. JochenSchiller, http://www.jochenschiller.de/ MC SS02 5.2 Historyof satellitecommunication 1945 Arthur C. Clarke publishes an essay about Extra Terrestrial Relays 1957 first satellite SPUTNIK 1960 first reflecting communication satellite ECHO 1963 first geostationary satellite SYNCOM 1965 first commercial geostationary satellite SatellitEarly Bird (INTELSAT I): 240 duplex telephone channels or 1 TV channel, 1.5 years lifetime 1976 three MARISAT satellites for maritime communication 1982 first mobile satellite telephone system INMARSAT-A 1988 first satellite system for mobile phones and data communication INMARSAT-C 1993 first digital satellite telephone system 1998 global satellite systems for small mobile phones Prof. Dr.-Ing. JochenSchiller, http://www.jochenschiller.de/ MC SS02 5.3 Applications Traditionally weather satellites radio and TV broadcast satellites military satellites satellites for navigation and localization (e.g., GPS) Telecommunication global telephone connections backbone for global networks connections for communication in remote places or underdevelopedareas global mobile communication satellite systems to extend cellular phone systems (e.g., GSM or AMPS) replacedbyfiberoptics Prof. Dr.-Ing. JochenSchiller, http://www.jochenschiller.de/ MC SS02 5.4 basestation orgateway Classicalsatellitesystems Inter SatelliteLink (ISL) Mobile User Link (MUL) GatewayLink (GWL) footprint smallcells (spotbeams) User data PSTN ISDN GSM GWL MUL PSTN: Public Switched Telephone Network Prof. Dr.-Ing. JochenSchiller, http://www.jochenschiller.de/ MC SS02 5.5 Basics Satellites in circular orbits attractive force F g = m g (R/r) centrifugal force F c = m r m: mass of the satellite R: radius of the earth (R = 6370 km) r: distance to the center of the earth g: acceleration of gravity (g = 9.81 m/s) : angular velocity ( = 2 f, f: rotation frequency) Stable orbit F g = F c 3 2 2 ) 2 ( f gR r = Prof. Dr.-Ing. JochenSchiller, http://www.jochenschiller.de/ MC SS02 5.6 Satellite period and orbits 10 20 30 40 x10 6 m 24 20 16 12 8 4 radius satellite period [h] velocity [ x1000 km/h] synchronous distance 35,786 km Prof. Dr.-Ing. JochenSchiller, http://www.jochenschiller.de/Prof....
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C05-Satellite_Systems - Prof. Dr.-Ing. JochenSchiller,

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