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EC821
USN
B. E. Degree (Autonomous) Eighth Semester End Examination (SEE), MAY/JUNE 2014
Satellite Communication
(Model Question Paper-II)
Time: 3 Hours ]
[ Maximum Marks: 100
Instructions to students:
1. Answer FIVE FULL Questions.
2. Question No. 3, 4 and 5 are COMPULSORY.
3. Answer ANY ONE from Question No. 1 and 2.
4. Answer ANY ONE from Question No. 6 and 7.
1.
a) Explain briefly the various services provided by a satellite
(06M)
b) Define keplerian elemental set.
(06M)
c)
An earth station is located at latitude 300S and longitude 650E. Calculate
the antenna look angles for the satellite at 1560E.
(08M)
OR
2.
a) Briefly explain the launching orbits for a geo stationary satellite
(08M)
b) A quasi geo satellite in a circular equatorial orbit, close to the geo
synchronous attitude. Its orbital period is exactly 24 hours, one solar day.
Calculate i)the radius of the orbit ii) the rate of drift around the equator of
the satellite point in degree/solar day. An observer on the earth sees that a (08M)
the satellite is drifting across the sky.iii) is the satellite moving towards the
east or towards the west?
c)
3.
Differentiate universal time and sidereal time
a) Explain atmospheric and ionospheric losses for satellites.
(04M)
(10M)
b) Calculate for a frequency of 12 GHz and for horizontal and vertical
polarization, the rain attenuation which is exceeded for 0.01% of the time
in any year, for a point rate of 10mm/h. The earth station altitude is 600m, (10M)
and the antenna elevation angle is 50 degrees. The rain height is 3km.
4.
a) What is meant by satellite altitude? Briefly describe three axis method of (07M)
Dr. Ambedkar Institute of Technology, Bengaluru – 560056
(An Autonomous Institution Affiliated to Visvesvaraya Technological University, Belgaum)
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satellite stabilization.
b) with the help of neat diagram, explain TTC and antenna subsystem
c)
(07M)
What is meant by frequency reuse? Briefly describe the working of a wide (06M)
band reciever
5.
a) With the neat block diagram, explain the outdoor and indoor unit for
analog FM/TV
b) Explain the spade system. With a neat diagram
6.
(12M)
(08M)
a) Calculate the bit rate that that can be carried in 36MHz channel using
QPSK, allowing the roll off factor of 0.2
(05M)
b) Give the apllications of radar sat. Explain a ‘ dawn to dusk’ orbit
(08M)
C)
(07M)
Write short notes on orbital spacing
OR
7.
a) Write short notes on: i) Iridium ii) orb communication
(10M)
b) Write short notes on: i) GPS
(10M)
ii) RADARSAT
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Dr. Ambedkar Institute of Technology, Bengaluru – 560056
(An Autonomous Institution Affiliated to Visvesvaraya Technological University, Belgaum)