GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VIII (New) EXAMINATION — WINTER 2019
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Subject Code: 2181103 Date: 21/11/2019
Subject 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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MARKS
Q.1 (a) Define following terms: 03
1) Pulse width 2) clutter 3) Duty Cycle
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(b) Explain range ambiguities and PRF. 04
(c) Briefly explain the basic principle of radar. Also explain and draw the 07
Appropriate block diagram of the pulse radar.
Q.2 (a) Explain minimum detectable signal. 03
(b) Explain CW radar with IF amplification. 04
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(c) Explain the principal and operation of FMCW radar in brief. 07
OR
(c) Explain MTI radar with all necessary details. 07
Q.3 (a) How multiple frequency CW radar can be used to measure the range of a 03
moving target?
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(b) Explain MTI radar using power oscillator as transmitter. 04
(c) A radar operating at 10GHz with the peak power of 500kW,the power gain 07
of the antenna is 5000 and minimum power is 10-10W.Calculate the maximum
range of the radar if the effective area of the antenna is 10m2 and the radar
cross section is 4m2.
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OR
Q.3 (a) Write a short note on weather clutter. 03
(b) Briefly discuss the propagation effects in radar. 04
(c) A CW transmits frequency of 10GHz and Doppler frequency is 07
1000Hz.calculate the radial velocity of the target.
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Q.4 (a) List the advantages and capabilities of electronic scanning. 03
(b) Explain dear rocking method of navigation in detail. 04
(c) Derive an expression for the emf induced in a loop antenna by an 07
electromagnetic wave incident at an angle © with the plane of the loop
antenna. Explain how the arrangement is used for determining the bearing
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of the transmitting station. How sense finding is done.OR
Q.4 (a) List and explain types of tracking. 03
(b) Explain radio method of navigation in detail. 04
(c) For air surveillance radar Explain how Tracking is done (TWS)? 07
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Q.5 (a) How position location determination is done GPS? 03
(b) Explain Adcock direction finder in detail. 04
(c) What is VOR? Explain its working. 07
OR
Q.5 (a) Define working principal of LORAN-C and list the components of 03
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LORAN-C system.(b) Explain Global Satellite Navigation system in detail. 04
(c) Explain microwave landing system in brief. 07
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