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Satellite Communication

Satellite Communication is a core subject in Electronics and Communication Engineering that explains long-distance communication using artificial satellites. It plays a vital role in television broadcasting, mobile communication, navigation, and global data networks.

The syllabus covers basic concepts of satellite communication, including space segment, earth segment, and ground control systems. Orbital mechanics such as Kepler’s laws, satellite orbits (LEO, MEO, GEO), and launch vehicles are studied.

Satellite subsystems including transponders, antennas, power systems, attitude control, and thermal control are discussed in detail. Link budget analysis and system noise temperature are essential topics for performance evaluation.

The course includes multiple access techniques such as FDMA, TDMA, and CDMA used in satellite networks. Propagation effects like rain attenuation, ionospheric and tropospheric impairments are analyzed.

Applications of satellite communication include DTH, VSAT, GPS, remote sensing, and satellite internet. This subject provides strong fundamentals for advanced communication systems and competitive examinations.

UNIT I SATELLITE ORBITS

Kepler‟s Laws, Newton‟s law, orbital parameters, orbital perturbations, station keeping, geo stationary and non Geo-stationary orbits – Look Angle Determination- Limits of visibility –eclipse-Sub satellite point –Sun transit outage-Launching Procedures - launch vehicles and propulsion.

UNIT II SPACE SEGMENT

Spacecraft Technology- Structure, Primary power, Attitude and Orbit control, Thermal control and Propulsion, communication Payload and supporting subsystems, Telemetry, Tracking and command-Transponders-The Antenna Subsystem.

UNIT III SATELLITE LINK DESIGN

Basic link analysis, Interference analysis, Rain induced attenuation and interference, Ionospheric characteristics, Link Design with and without frequency reuse.

UNIT IV SATELLITE ACCESS AND CODING METHODS

Modulation and Multiplexing: Voice, Data, Video, Analog – digital transmission system, Digital video Broadcast, multiple access: FDMA, TDMA, CDMA, DAMA Assignment Methods, compression – encryption, Coding Schemes.

UNIT V SATELLITE APPLICATIONS

INTELSAT Series, INSAT, VSAT, Mobile satellite services: GSM, GPS, INMARSAT, LEO, MEO, Satellite Navigational System. GPS Position Location Principles, Differential GPS, Direct Broadcast satellites (DBS/DTH).

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