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Posted By: ram Member Level: Diamond Posted Date: 03 Sep 2008
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2006 Jawaharlal Nehru Technological University Electronics & Communications Engineering IV B.Tech. II Semester Regular Examinations, April/May -2006 RADAR ENGINEERING Question paper
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Code No: RR420402 Set No. 3
IV B.Tech II Semester Regular Examinations, Apr/May 2006
RADAR ENGINEERING
(Electronics & Communication Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Describe a pulsed Radar system. Discuss how the direction and range of an
object is determined using this system.
(b) Discuss about the frequencies used for radar. [10+6]
2. (a) What do you understand by false alarm? What are the design precautions to
be taken to minimize it?
(b) Describe the different noise components present in Radar systems. [8+8]
3. (a) Explain the principle and applications of CW Doppler Radar.
(b) Estimate the Range of a FMCW Radar, if its frequency is modulated at a rate
fm over a range f. Derive the expression used, hence calculate its range, if
f=1.6KHz, fm=100KHz and Beat frequency is 30Hz. [7+9]
4. (a) Draw and explain frequency-response characteristics of an MTI using range
gates and filters.
(b) What is the difference between MTI radar using range gates and an MTI with
a single-delay-line canceler. [8+8]
5. (a) Mention the limitations of MTI radar related to clutter parameters.
(b) Mention the limitations of improvement factor imposed by pulse-to-pulse in-
stability.
(c) Write short notes on inter clutter visibility. [6+5+5]
6. (a) How is radar target acquired in a typical radar?
(b) What factors determine the range and angular accuracies in a radar? [8+8]
7. (a) Define the noise figure for a radar receiver, and obtain an expression for the
noise figure for 3 networks in cascade.
(b) Explain the functioning and characteristics of PPI display. [10+6]
8. (a) Explain the characteristics of a matched filter receiver, with necessary equa-
tions.
(b) Write notes on: Noise jamming, Repeater jamming.
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