STUPIDSID
MU Electronics and Telecom Engineering (Semester 8)
Satellite Communication & networks
December 2014
Satellite Communication & networks
December 2014
1 (a)
Explain what is meant by ascending and descending notes. Would you expect them to change with time? Explian.
5 M
1 (b)
Explain what is meant by geostationary orbit. How do the this is differ from geosynchronous.
5 M
1 (c)
Explain what is meant by 'Effective path length' in connection with rain attenuation
5 M
1 (d)
In most satellite TV receivers the first IF band is converted to a second, fixed IF.
Why is this second frequency conversion required?
5 M
1 (e)
Explain why the low-noise amplifier of a receivers system is laced at the antenna
end of the feeder cable.
5 M
2 (a)
Explain what is meant by 'Noise factor'. For what source temperature is noise factor defined? The EIRP from a satellite is 49.4dBw. Calculate.
(i) The power density at a ground station for which the range is 40,000 km and
(ii)The power delivered to a matched load at the. ground station receiver if the antenna gain is 50 dB. The downlink frequency is 4GHz.
(i) The power density at a ground station for which the range is 40,000 km and
(ii)The power delivered to a matched load at the. ground station receiver if the antenna gain is 50 dB. The downlink frequency is 4GHz.
6 M
2 (b)
Explain in detail the operation of the spade system of demand assignment. What is the function of the common signalling channel?
10 M
3 (a)
Define and explain what is meant by frame efficiency in relation to TDMA operation. Explain why the frame period in a TDMA system is normally chosen to be an integral multiplication of 125 uses.
10 M
3 (b)
Explain what is meant by polarization interleaving. With the help of block diagram explain indoor receiving unit of a satellite TV/FM receiving.
10 M
4 (a)
Why faraday rotation is no concern with circularly polarized waves? Explain how depolarization is caused by rain and ice and it is taken care in link analysis?
10 M
4 (b)
Discuss briefly how perturbations affects the planetary motion
10 M
5 (a)
Explain briefly the 'Offset feed' used with paraboloidal reflector antenna, stating its main advantages and disadvantages. Explain with neat diagrams the antennas used in satellite communication.
10 M
5 (b)
What are issues faced by communication satellite with respective to life time and reliability? What are space particles? What is their impact on the satellite?
10 M
6 (a)
Discuss the TT&C system of a communication satellite. Explain what is meant by 'Redundant receiver' in communication satellite.
10 M
6 (b)
Define and explain the term 1-dB compression point. What the significance of this point in relation to the operating point of a TWT? Explain why operation
near the saturation point of a TWTA is to be avoided when multiple carriers are
being amplified
10 M
Write short note (any four)
7 (a)
Different stabilization techniques
5 M
7 (b)
VSAT
5 M
7 (c)
Satellite Radio
5 M
7 (d)
Earth station Design considerations.
5 M
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