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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 Factor Link Availability Link Access Time ThreatAdvantages of Digital Communication Less distortion and interference Easy to regenerate Low error rates Multiple streams can be easily multiplexed into a single stream Security Drift free, miniature, low power hardwareTracking Telemetry & Control Telemetry Voltages, currents, temperatures, accelerations, valve a

Satellite Communication Col John Keesee. Satellite Communications Architecture • Identify Requirements ... – Intelsat/ ˜COMSAT – TDRS - Tracking and Data Relay Satellite. Data Collection Mission duty cycle ... • Relay/Ground Station frequency • Antenna size • Atmospheric/Rain attenuation

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