GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VIII (OLD) EXAMINATION — WINTER 2018
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Subject Code: 181103 Date: 26/11/2018Subject Name: Radar & Navigational Aids
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Define the following parameters: 07
i) False alarm ii) Unambiguous range
iii) Radar Cross section iv) Minimum detectable signal
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(b) Enlist the important applications of Radar? Also describe Frequency 07
band used for various applications.
Q.2 (a) Enlist different types of displays used in Radar? Explain any two in 07
detail.
(b) Prove that the amplitude of the direction finding loop antenna is 07
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given by 2pana(cosf).OR
(b) Prove that clutter power is inversely proportional to the square of the 07
range.
Q.3 (a) Describe Second-time-around echoes effect in Radar with necessary 07
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waveforms.(b) Draw and explain block diagram of conical-scan tracking radar. 07
OR
Q.3 (a) What is Doppler effect? Draw the block diagram of Pulse Doppler 07
Radar. Explain function of each block in detail.
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(b) What do you understand by blind speed? How to eliminate it. 07
Q.4 (a) Explain MTI radar operation with the help of block diagram. How 07
moving objects are recognized on an A Scope?
(b) Explain the principle of RADAR with the help of block diagram. 07
Explain radar range equation in terms of receiver noise figure,
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bandwidth and other related parameters.OR
Q.4 (a) Draw neat block diagram of FMCW radar and enlist its distinguished 07
features.
(b) Explain Global Positioning system. 07
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Q.5 (a) What is V.O.R? Explain necessary operation of the VOR ground equipment. 07
(b) Explain working of Microwave landing system (MLS). Also 07
mention its advantage and disadvantage.
OR
Q.5 (a) Explain the Distance Measuring Equipment in detail. 07
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(b) Explain Principle of Hyperbolic Navigation. Compare the Operation 07
of LORAN-A and LORAN -C.
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