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Posted By: Sree.... Member Level: Diamond Posted Date: 07 Feb 2008
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2007 Andhra Pradesh State Jawaharlal Nehru Technological University B.Tech RADAR ENGINEERING Set No.4 Question paper
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Code No: RR420402 Set No. 4
IV B.Tech II Semester Supplementary Examinations, June 2007
RADAR ENGINEERING
(Electronics & Communication Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Derive the maximum range for a Radar system, from first principles.
(b) A pulsed Radar operating at 10 GHz has an antenna with a gain of 28 dB
and a transmitter power of 2kW (Pulse power). If it is defined to detect a
target with a cross section of 12 sq.m. and the minimum detectable signal is
Pmin=-90 dBm. What is the maximum range of the Radar? [8+8]
2. (a) How is the effect due to cross-section fluctuations of targets minimized?
(b) Discuss about the probability of false alarm.
[8+8]
3. (a) With a neat block diagram explain how a CW Radar is used for the determi-
nation of the relative velocity of a target.
(b) Determine the acceleration of a target if the received signal bandwidth is 40Hz
and the operating wavelength is 9cms. [10+6]
4. (a) A simple MTI delay line canceler is an example of time domain filter. Why ?
Explain.
(b) Enumerate the advantages of time domain delay line canceler as compared to
the conventional frequency domain filter. [8+8]
5. Explain the following limitations of MTI radar.
(a) Equipment instabilities.
(b) Scanning modulation.
(c) Internal fluctuation of clutter. [5+5+6]
6. (a) Compare the tracking techniques.
(b) Explain in detail about limitations to tracking accuracy. [10+6]
7. (a) Describe the characteristics of cosecant squared antennas, and their radar
applications.
(b) What are the applications of Cassegrainian antennas? [10+6]
8. Write notes and explain about:
(a) Passive ECM
(b) Matched and non-matched filters
1 of 2
Code No: RR420402 Set No. 4
(c) North filter.
(d) Antijamming techniques. [4×4]
? ? ? ? ?
2 of 2
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