Osmania University (OU) 2006-2nd Sem B.E Electronics & Tele-Communication Engineering 4/4 (E.C.E)(ESTER)SUPPLEMENTARY ,IL, Radar and satellite communication systems - Question Paper
B.E 4/4 (E.C.E)(II-SEMESTER)SUPPLEMENTARY EXAMINATION,APRIL,2006
Radar and satellite communication systems
Code No.: 10539/N
FACULTY OF ENGINEERING
B.E. TV/TV Year (ECE) II Semester (Main) Examination,
April 2006
(New)
RADAR AND SATELLITE COMMUNICATION SYSTEMS
Time : 3 Hours) [Max, Marks : 75
Answer all questions of Part A.
Answer five questions from Part B.
Part A - (Marks : 25)
1. What is the effect of pulse repetition frequency on the performance of the Radar?
2. List the different types of Radar antennas used.
3. Define Radar Cross Section of a target.
4. Give at least two applications of monopulse Radar.
5. Distinguish between search mode and tracking mode of a Radar.
6. State the law of planetary motion.
7. What are the various orbits in which a satellite can exist?
8. What is meant by look angles?
9. List the parameters that control the design of an earth station.
10. List the various techniques of multiple access.
Part B - (Marks : 5 x 10 = 50)
11. (a) Obtain the Radar range equation from first principle. Discuss its usefulness in
predicting the maximum range.
(b) What is integration of Radar pulses? How does it help to improve the performance?
12. (a) Show that a CW Radar can determine the range but of no practical use. Explain
how it can measure range and velocity using frequency modulation.
(b) Explain the principle of operation of an MT1 Radar. Discuss the limitations of blind speeds in MU Radars.
13. (a) What is the significance of a monopulse? Describe the operation of an amplitude
comparison monopulse Radar with a neat block schematic diagram.
(b) What are the different methods of tracking in range? Describe in detail any two
of these methods.
14. (a) With neat sketches explain the operation of the following Radar displays:
(i) A-scope (ii) PPI (iii) RMI and (iv) B-scope.
(b) What do you mean by perigee and apogee? Derive an expression for the velocity of a satellite at its perigee and apogee in terms of semi-major axis and eccentricity of earth.
15. (a) Why is the UPLINK frequency different from the DOWN LINK frequency In a
satellite communication system?
(b) Derive the general link design equation. Find out the expressions for rr and
-z: ratios. Explain the importance of these ratios on the satellite link design.
16. (a) Explain the following with their merits and demerits:
(i) TDMA (ii) FDMA and (iii) CDMA
(b) Explain briefly about the basic satellite primary power systems and their elements,
17. (a) Discuss in detail the effect of the following on satellite link:
(i) Rain and ice
(ii) Atmospheric absorption and
(iii) Multipath.
(b) What are the frequency bands allocated to satellite communications in India and explain the reasons for the same?
(c) Explain satellite data communication protocols.
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