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Satellite Communication - MIT OpenCourseWare

Satellite CommunicationCol John KeeseeSatellite Communications Architecture Identify Requirements Specify Architectures Determine Link Data Rates Design & Size each link Document your rationaleDefinition Uplinks Downlinks Crosslinks Relays TT & CUplinkDownlinkIntersatellitelinksRelay satelliteRelay satelliteRelay satelliteSensor satelliteSensor satelliteCrossover orIntersatellitelinksMission dataLaunchphaseTT&CTT&CSatelliteGround stationTT&CTracking, Telemetry and ControlThe communications architecture consists of satellites and ground stations interconnectedwith communications links. (Adapted from SMAD.)Architectures:Defined by Satellite -Ground Geometry Store & Forward Geostationary Molniya Geostationary/ Crosslink LEO/ CrosslinkAdapted from :Defined by Function System Function Tracking Telemetry & Command Data Collection Data Relay Satellite Design Onboard Processing Autonomous Satellite Control Network ManagementCommunications Architecture: Selection Criteria Orbit RF Spectrum Data Rate Duty Fa

4 6 12 14 17.3 20.2 225 Mhz 400 Mhz 1.761-1.842 2.200-2.290 7.25 7.75 7.9 8.4 78 19.2 20.2 29 30 20.2 MILSTAR, GBS Downlink 21.2 30 31 43 45 SATCOM users are secondary in UHF: subject to interference from terrestrial users Heavy orbital/terrestrial congestion: much coordination with terrestrial users needed 1 GHz 1 GHz 1 GHz 1 GHz 2 GHz 800 Mhz ...

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