MU Electronics and Telecom Engineering (Semester 8)
Satellite Communication & networks
May 2014
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


1 (a) Explain the significance of microwave frequencies in satellite communication
5 M
1 (b) State and explain Kepler's Laws
5 M
1 (c) What are advantages of satellite communication over terrestrial communication.
5 M
1 (d) What is transponder ? Explain single conversion transponder
5 M
1 (e) What is meant by polarization of Satellite signals. Explain ionospheric and rain depolarization.
5 M

2 (a) What is telemetry tracking and command subsystem ? Explain its functioning with block diagram.
10 M
2 (b) Draw block diagram of transmit-receive type earth station. Explain each block in brief.
10 M

3 (a) Explain spin stabilization and 3-axis stabilization methods. Mention their merits and demerits.
10 M
3 (b) What do you mean by system noise temperature ? How does it affect C/N and GT ration
10 M

4 (a) What do you understand by reliability and space qualification ? Explain significance of bath-tub curve.
10 M
4 (b) Explain different types of antenna used in satellite communication.
10 M

5 (a) A Geostationary satellite is located 35° ?W. What are its look angles and range from (i) Brad ford UK station (54°N, 2°W) (ii) Blacksburg USA (37°N. 80°W).
10 M
5 (b) What are different methods of launching of satellite ? Explain.
10 M

6 (a) Explain SPADE system of FDMA
10 M
6 (b) Explain with neat block diagram the FH-CDMA and DS-CDMA systems. Also list advantages ofCDMA system.
10 M

Write short note on (any two)
7 (a) Orbital Parameters
10 M
7 (b) VSAT
10 M
7 (c) Combined uplink and downlink C/N ratio.
10 M



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