| GENERAL INFORMATION: | Instructors: Sarafopoulos Dimitrios |
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| CREDITS: | ECTS Units: 5 |
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| COURSE PAGE: | ||
Course Description |
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| The space and ground segments. Types of orbits. Frequency allocation. Technology trends. Services. The space environment. Keplerian orbits. Kepler’s laws. Orbital parameters. Earth–satellite geometry. Useful orbits for satellite communication. Geostationary satellite orbits. Low earth orbits and satellite constellations. Perturbations of orbits. Orbit corrections: station keeping of geostationary satellites. Propagation delay over satellite links. Subsystems. Attitude control and sensors. Actuators. The principle of gyroscopic stabilisation. Spin stabilisation and ‘Three-axis’ stabilisation. The propulsion subsystem. Chemical and electric propulsion. The electric power supply. Primary and secondary energy sources. Telemetry, tracking and command (TTC). Thermal control subsystem, specifications. Passive and active control. Antenna coverage. Service zone contour. Global and reduced or spot coverage. Types of antenna. Antenna technologies. Antenna parameters. Gain. Radiation pattern. Effective isotropic radiated power (EIRP). Power flux density. Received signal power. Noise temperature of an antenna. Link budget. Link impairments. Link performance under rain conditions. Traffic routing. Multiple access to the satellite channel. Frequency division multiple access (FDMA). Time division multiple access (TDMA). Frame structure. Synchronisation. Code division multiple access (CDMA). Direct sequence CDMA. Frequency hopping CDMA. Code generation. CDMA efficiency. Fixed and on-demand assignment. Random access. Asynchronous protocols. Protocols with synchronisation. Digital video broadcasting via satellite (DVB-S). Error performance requirements. Second generation DVB-S2. Transmission system architecture. Launch vehicles. Very small aperture terminals (VSATs). VSAT network. | ||
