Department of Electronics &Telecommunication Engineering
Sem:VIII
Question Bank of Satellite Communication
Chapter 1
1) What are the advantages and disadvantages of Geostationary orbit ?
2) State & explain Kepler's laws of planetary motion.
3) Explain briefly how will you locate a satellite in the orbit.
4) Draw the block diagram of Attitude & orbit control system & explain it in
detail.
5) Write a short note on orbital perturbations.
6) Draw the diagram of Telemetry, Tracking & Command System and also
explain its working.
7) What are the orbital elements ? Explain in brief.
8) Describe the different subsystem placed on the satellite with proper
Specification.
9) What are the Advantages and disadvantages of satellite communication.
10) Explain the Terms:
a) Elevation Angle
b) Azimuth Angle
c) Apogee point
d) Mean Anamoly
11) Differentiate between Geosynchronous and Geostationary orbit. Mention
advantages & disadvantages geostationary orbit.What is necessity of polar
orbit.
12) Derive the equation of orbit of satellite.
13) A satellite is orbiting in an equatorial plane with a period from perigee to
perigee of 12 hr. Given that the eccentricity is 0.002, Calculate the semi
major axis. The earth's equatorial radius is 6378.1414km.
14) Explain the 6/4 GHz transponder system
Chapter 2
1) Explain the design of the downlink of satellite communication system. Also
derive the expression for the power received at the earth station.
2) Explain various design issues related with uplink design & give the expression
of C/N for the same.
3) Derive the complete link design equation.
4) Derive the expression for system noise temperature.
5) An earth station antenna has a diameter of 30 m, has an overall efficiency of
68% and is used to receive a signal of 4150 MHz. At this frequency, the
system noise temperature is 79 K when the antenna points at the satellite at an
elevation angle of 28. What is the earth station G/T ratio under these
conditions ? If heavy rain causes the sky temperature to increase so that the
system noise temperature rises to 88 K, what is the new G/T value ?
6) A satellite at a distance of 40,000 km from a point on the earth's surface
radiates a power of 10 W from an antenna with a gain of 17 dB in the direction
of the observer. Find the flux density at the receiving point & the power
received by an antenna at this point with an effective area of 10 m2.
7) Explain with neat diagram the system of up-link & down link communication
using satellites.
8) Derive the expression for system noise temperature of receiver system.Suppose
we have 4GH receiver with following gains and noise temperature.
Tin= 50K, GRF = 25 Db, TRF= 60 K, TM = 550 K, TIF = 1000K, GIF =30K,
Gin=0Db.Calculate system noise temperature.
9) Explain the basic transmission theory in detail. Also derive the expression for
received power.
10)Explain domestic satellite system with suitable example
Chapter 3
1) What is meant by inter-modulation products ? How are they produced ?
Explain with mathematical expression.
2) Write a short note on DAMA.
3) What are the techniques used for spread spectrum transmission ? Explain
SS-CDMA transmission & reception using direct sequence psedonoise
technique.
4) Write a short note on TDMA.
5) What is TDMA ? What is TDMA frame ? Explain TDMA in detail. What is
preamble and how it is useful in synchronization.
6) What is CDMA? What is DS-SS CDMA and FH-SS CDMA in detail.
7) Explain in detail Slow and Fast Frequency Hop Spread Spectrum.
8) What is Preamble? How it is useful in Synchronization and Timing?
9) Give the silent features of TDM.
10) Write a short notes on TURO.
11) What is FDMA explain it in detail.Explain Energy disposal in FM/FDM
signal.
Chapter 4
1) What do you mean by propogation effects ? Explain briefly
2) Explain the effect of atmospheric absorption on satellite communication.
3) Explain rain &ice effect on satellite communication.
4) Write a short note on effect of rain on antenna noise temperature.
5) Explain the Land and Sea multipath effects.
6) Explain how attenuation and depolarization effects are minimised?
7) What is scintillation effect ? Explain in detail.
8) Explain site diversity and depolarizations.
9) What is scintillation effect? Explain ionospheric scintillation.
Chapter 5
1)Explain the channel capacity. State & explain Hartley Shannon law with
power limited & B.W. limited link.
2) What are convolutional codes ? Explain how they are generated ? State is
advantages over linear block code.
3) The purity check matrix of a particular (7, 4) linear block code is expressed as
Obtain the generator matrix (G) &List of all code vectors
H = [1 1 1 0 1 0 0]
[ 1 1 0 1 0 1 0]
[1 0 1 1 0 0 1]
4) Construct a decoding table for a single error correcting (7, 4) cyclic code if the
generator polynomial g(x) is x3+ x2+ 1. If the received code ward is 1101010, find
whether it is in error. If yes, what is the correct codeward which was transmitted.
5) Costruct a (5,2)linear block code and determine error correcting capabilities if
the generator matrix is:
G = [1 0 1 1 1]
[ 0 1 1 01]
6) The generator matrix for a (6,3)block code is given below.Find all the code
vectors of this code.
G = [1 0 0 : 0 1 1]
[ 0 1 0: 1 0 1]
[ 0 0 1: 1 1 0]
7) Write a short notes on Automatic Repeat Request.
8) A (7,4)Cyclic code uses generator polynomial g(x)=x3+x2+1,find the systematic
codeword for the data 1010,0101,1001,0110
9) Differentiate between block code and convolution code.Explain erroe detecting
and correcting capabilies of linear block code.
10) Explain generation of cyclic codes. How errors can be detected and corrected
in cyclic codes.
11) The generator polynomial of a (7,4)cyclic code is G(p)=p3+p+1.Find all the
code vectors for the code in non-systematic and systematic form.
12)Explain error control coding in detail.
Chapter 6
1) Write short notes on:
a) RF multiplexer
b) Tracking
c) Feed System
d) VSAT Network.
e) Earth station parameter.
2) Explain the factors affecting the orbit utilization.
3) What are the requirements of earth station antenna for satellite communication.
4) Explain LNA and HPA briefly.
5) What are the techniques used for tracking? Explain in brief.
6) Explain the equipment's used in earth station design.
Subject teacher
Ms.V.S.Pande
