Satellite Communication & networks - May 2014

MU Electronics and Telecom Engineering (Semester 8)

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 marks

1 (b) State and explain Kepler's Laws 5 marks

1 (c) What are advantages of satellite communication over terrestrial communication. 5 marks

1 (d) What is transponder ? Explain single conversion transponder 5 marks

1 (e) What is meant by polarization of Satellite signals. Explain ionospheric and rain depolarization. 5 marks

2 (a) What is telemetry tracking and command subsystem ? Explain its functioning with block diagram. 5 marks

2 (b) Draw block diagram of transmit-receive type earth station. Explain each block in brief. 5 marks

3 (a) Explain spin stabilization and 3-axis stabilization methods. Mention their merits and demerits. 5 marks

3 (b) What do you mean by system noise temperature ? How does it affect C/N and GT ration 5 marks

4 (a) What do you understand by reliability and space qualification ? Explain significance of bath-tub curve. 5 marks

4 (b) Explain different types of antenna used in satellite communication. 5 marks

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). 5 marks

5 (b) What are different methods of launching of satellite ? Explain. 5 marks

6 (a) Explain SPADE system of FDMA 5 marks

6 (b) Explain with neat block diagram the FH-CDMA and DS-CDMA systems. Also list advantages ofCDMA system. 5 marks

Write short note on (any two)

7 (b) VSAT 5 marks

7 (c) Combined uplink and downlink C/N ratio. 5 marks