Download AKTU B-Tech 8th Sem 2015-16 EEC 069B Satelite Communication Question Paper

Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 8th Semester (Eight Semester) 2015-16 EEC 069B Satelite Communication Question Paper

Printed Pages: 4 EEC-069B
(Following Paper ID and Roll No. to be ?lled in your
Answer Books)
Roll No.
B.TECH.
Theory Examination (Semester?VIII) 2015-16
SATELLITE COMMUNICATION
Time .' 3 Hours Max. Marks : 100
Section-A
Q1. Attempt all parts All ,...-w yurry equal marks. Write
answer of each part in short. (2X10=20)
(a) Discuss the methods to achieve station keeping of
satellite.
(b) What do you understand by argument of perigee?
(c) Write uplink and downlink frequencies of satellite
communcation. Explain the reason why these
frequencies are different?
((1) Explain Kepler?s laws of planetary rotation.
1 (1) P.T.O.

Q2.
(f)
(g)
(h)
(i)
0)
Describe the function of a satellite transponder.
What do you mean by carrier to noise ratio?
Describe its signi?cance for satellite link design?
Explain the ice eifect in satellite communication.
Enlist the applications of medium-gain directional
mobile satellite antennas.
Describe the utilization of pre?emphasis and de?em?
phasis.
Write: the name of codes for error control for agttal
satellite links. ?
Section-B
Attempt any ?ve questions from this section.
(a)
(10x5=50)
Write the advantages and disadvantages of Geosta-
tiouary orbit. A satellite moving in a hjghly eccentric
Molniya orbit having the farthest and the closest poins
as 35000km and 500km respectively from the sur-
face of the earth. Determine the orbital time period
and the velocity at the apogee and perigee points.
Q) RIO.

(b)
(C)
(d)
(e)
(D
Q)
(h)
Explain rain attenuation and rain depolarization in detail
with suitable diagrams.
State and explain the different segments of GPS. What
is meant by satellite signal acquisition in GPS?
Discuss the various types of antenna used for mobile
satellite broadcasting. What are their technical
requirements?
With the help of a suitable block diagram, explain
the working of DBS Television network in detail.
Derive the general link equation. Find out the expression
for C/N and Gfl" ratio.
What do you understand by system noise tempera-
ture? Derive its relation for equivalent system noise
temperature.
With the help of a suitable diagram, explain satellite
communcation system architecture using VSAT. Also
write the Applications of VSAT.
0) BIG.

Section-C
Note: Attempt any two questions from this section.
Q3.
Q4.
Q5.
(a)
(b)
(b)
(a)
(b)
(15x2=30)
What are the factors that affect the uplink design
and the downlink design in geostationary satellites?
What is meant by look angles? Explain them with
reference to a geostationary satellite and the earth
station.
Write short note on satellite signal acquisition.
The EIRP of a 240 W transponder is 57 dB W. Cal-
culate the approximate gain of the antenna if the
transponder is switched to 120 W. Also calculate the
new EIRP assuming that the same antenna is used.
Three ampli?ers are connected in cascade having a
gain of 20 dB each. If the noise temperature is 100K,
determine the overall gain.
Write short note on Wire Quadri?lar Helix Anterma
(WQHA) for hand held terminals.
(4) IVFC)