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MU Electronics and Telecom Engineering (Semester 8)
Satellite Communication & networks
December 2013
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) What is spot beam ? Explain its use in satellite communication.
5 M
1 (b) Define
(i) Argument of Perigee.
(ii) Right Ascension of ascending node
5 M
1 (c) Compare ELV and STS methods of launching satellite.
5 M
1 (d) Explain rain depolarisation in detail.
5 M

2 (a) What are look angles ? Explain its significance in relation to satellite position. Hence solve an Earth station is located at a latitude of 12° south and longitude of 52°W. Calculate antenna look angles for 0 satellite at 70°W.
10 M
2 (b) Describe various reasons for perturbation of satellite orbits
10 M

3 (a) Which type of double reflectors are used in satellite communication. Explain in detail.
10 M
3 (b) What is intermodulation noise ? Does it affect the C/N ratio. Derive the expression for same
10 M

4 (a) What is TT&e subsystem ? Explain the type of antennas used for tracking and command signal transmitting during transfer orbit.
10 M
4 (b) Draw and explain block diagram of FDM/F M/FDMA earth station
10 M

5 (a) Compare advantages of TDMA, FDMA and DS-SS CDMA Satellite signal.
10 M
5 (b) Explain satellite space and mass power estimate in detail.
10 M

6 (a) What is eclipse ? Are there any ways of avoiding eclipse during lifetime of satellite.
10 M
6 (b) Explain the following :-
(i) Point of compression of MB.
(ii) AM to PM conversion.
(iii) UP and output back off ratio
10 M

Write short notes on (any two)
7 (a) TDMA synchronization
10 M
7 (b) Orbital parameters
10 M