GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-VIII (NEW) EXAMINATION — WINTER 2020
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Subject Code:2181103 Date:19/01/2021Subject Name:Radar & Navigational Aids
Time:02:00 PM TO 04:00 PM Total Marks: 56
Instructions:
- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Explain the principle of RADAR with the help of block diagram. 03
(b) Explain Radar range equation and its significance. 04
(c) Define the following parameters: 07
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- Delay line canceler
- Duplexer
- Blind Speed
- Pulse repetition frequency
Q.2 (a) Enlist the important applications of Radar? 03
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(b) What is Navigation and Explain different types of navigational aids. 04
(c) What is the peak power of a radar pulse if the pulse width is 1µsec, the 07
PRF is 1500Hz and the average power is 500Watts? What is the duty cycle? Calculate the unambiguous range in nautical miles.
Q.3 (a) Explain Radar Cross section. 03
(b) Define radar clutter & prove that clutter power is inversely 04 proportional to the square of the range
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(c) How Loop antenna can be used for direction finding? What is the 07 problem of direction ambiguity? How can we solve this problem?
Q.4 (a) Derive the Radar range equation in terms of bandwidth. 03
(b) Draw the block diagram of pulse radar and explain its operation 04 describing the function of all modules
(c) Explain MTI radar operation with the help of block diagram. How 07 moving objects are recognized on an A Scope?
Q.5 (a) Give the point difference between STALO and COHO 03
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(b) What is Doppler Effect? List advantages of Pulse Doppler radar over 04 CW radar.
(c) Explain working of Microwave landing system (MLS). Also 07 mention its advantage and disadvantage.
Q.6 (a) What is meant by Satellite Constellations? 03
(b) Enlist different types of displays used in Radar? Explain any one in 04 detail.
(c) Discuss FM-CW radar with block diagram. 07
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Q.7 (a) How do tracking and scanning radar differ? 03
(b) Write short notes on Doppler Navigation. 04
(c) Explain Global Positioning system. 07
Q.8 (a) Enlist various errors in direction finding. 03
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(b) Explain Synthetic Aperture radar 04
(c) Explain the principle of working of LORAN A. Discuss the sequence 07 of transmission and reception of pulses. How absolute delay is measured?
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