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Firstranker's choiceSeat No.: Enrolment No.
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GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-VIII (OLD) EXAMINATION — WINTER 2020
Subject Code:181103 Date:25/01/2021
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Subject Name:Radar & Navigational Aids
Time:02:00 PM TO 04:00 PM Total Marks: 56
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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) Enlist and explain the applications of RADAR 07
(b) Briefly explain the basic principle of radar. Also explain and draw the appropriate block diagram of the radar set. 07
Q.2 (a) List the four methods of navigation. Describe any one in detail 07
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(b) Define Normalized RCS. Derive Surface clutter RADAR equation. 07
Q.3 (a) What is Doppler Effect? What is its application in MTI radar? Explain it in terms of Doppler frequency fd. 07
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(b) What is a multiple-time-around echoes and how it is related to radar’s PRE? Considering three targets at different distances, explain a method of distinguishing MTA echoes from unambiguous echoes, using A scope. 07Q.4 (a) What do you mean by Blind phase? Differentiate between blind speed and blind speed with neat waveforms .With the help of necessary block diagram explain the working of a digital MTI Doppler signal processor. 07
(b) What is DME? Explain the-operation of DME inside the aircraft. 07
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Q.5 (a) Why the conical scan is more preferable over the sequential lobing? Justify it. 07
(b) How Loop antenna.can be used for direction finding? What is the problem of direction ambiguity? Give the solutions for this problem 07
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Q.6 (a) How N-pulseDelay line cancelers are effective for MTI RADAR? 07
(b) List the three different radar range equations. Discuss their significance and Justify “Maximum range of the radar is inversely proportional to the square-root of wavelength” 07
Q.7 (a) What do you mean by VOR? Explain VOR receiving equipment 07
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(b) With a neat sketch describe the TACAN beacon equipment. Explain how the desired antenna pattern is obtained and timing of the reference pulse groups is ensured. 07
Q.8 (a) Write short note on Navstar GPS Receiver system 07
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(b) Write short note on Instrument landing system. 07--- Content provided by FirstRanker.com ---
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