Download BBA IInd SEMESTER EXAMINATION 2008-09

B.Tech VIII (Eighth) Semester Examination 2013-14
Course Code: EEC802
Paper ID: 0968404
Satellite Communication
Time: 3 Hours
Max. Marks: 70
Note: Attempt six questions in all. Q. No. 1 is compulsory.
1.
a)
b)
c)
d)
e)
f)
g)
h)
2.
Answer any five of the following (limit your answer in 50
words).
(4x5=20)
What are orbital parameters required to determine a satellite’s
orbit? Explain them.
What is meant by look angles? Explain them with reference
to a geostationary satellite and earth station.
A satellite is moving in a highly eccentric orbit having the
farthest and closest point as 35000 km and 500 km
respectively from the surface of earth. Determine the orbital
time and velocity at apogee and perigee points. (Earth
radius=6360 km, Kepler’s constant=3.986 × 105 km3/s2).
Explain what is meant by earth eclipse of an earth orbiting
satellite. Why they occur near the equinoxes?
An earth station situated in the Docklands of London,
England, needs to calculate the look angle to a geostationary
satellite in the Indian Ocean operated by Intelsat. The details
of the earth station site and the satellite are as follows:
Earth station latitude and longitude are 52.0° N and 0°.
Satellite longitude (subsatellite point) is 66.0° E. Calculate
the 1ook angle.
Explain the Kepler’s three laws of planetary motion.
Explain the advantages and disadvantages of satellite
communication.
Explain GPS position location principles.
Explain what the terms centrifugal and centripetal mean with
regard to a satellite in orbit around the earth. Define various
satellite orbits.
(10)
3.
What are the factors that affects the uplink design and
downlink design in geostationary satellite communication?
Derive the expression for (C/N) uplink, downlink and overall
satellite link.
(10)
4.
Draw the block diagram of satellite communication
subsystem and explain the function of each block. Also
explain why operation near saturation point of TWTA is
avoided when multiple carriers are being amplified
simultaneously.
(10)
5.
Explain what Mesh and Star architecture are in a VSAT
network. Give two advantages and disadvantages of the Mesh
and Star architecture.
(10)
6.
Write short notes on any two of following.
a) DBS TV
b) Mobile Satellite Services.
c) DTH
(10)
7.
With reference to Satellite Communication differentiate
between FDMA, TDMA, CDMA, FDMA/DMA, giving their
merits and demerits.
(10)
8.
Explain the propagation effects that lead to signal loss on
transmission through the earth’s atmosphere.
(10)