Download GTU B.Tech 2020 Summer 8th Sem 2181103 Radar And Navigational Aids Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE — SEMESTER -VIII - EXAMINATION- SUMMER 2020

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Subject Code: 2181103 Date:29.10.2020
Subject Name: Radar and Navigational Aids
Time:02.30 pm to 05.00 pm Total Marks: 70

Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

MARKS

Q.1 (a) Enlist the applications of RADAR and explain briefly. 03
(b) List four methods of navigation and briefly describe any 04

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one.
(c) Derive the fundamental form of Radar range equation. 07
Discuss the factors affecting the maximum range of radar

Q.2 (a) Explain briefly : Multiple around echoes. 03
(b) Discuss errors and accuracy in DECCA system. 04

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(c) Draw the block diagram of MTI radar with power 07
oscillator transmitter and explain its operation.

OR

(c) Describe GAGAN and NAVIC receiver system. 07

Q.3 (a) Write advantages and limitations of VOR 03

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(b) Explain briefly operation of VHF Omni directional radio 04
range receiver.
(c) Draw and explain block diagram of CW radar. Compare 07
it with FMCW. radar and multiple frequency CW radar.

OR

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Q.3 (a) Distinguish between COHO and STALO. 03
(b) Explain the working principle of synthetic aperture radar 04
(SAR ) and write its application.
(c) What is the principle of TACAN? Explain working of 07
TACAN with the help of simple block diagram.

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Q.4 (a) Explain how tracking and scanning radar differ ? 03
(b) Draw block diagram of an electronic scanning system 04
and explain its operation.
(c) What do you mean by term tracking radar? Explain the 07

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working of mono pulse radar with the help of block
diagram.

OR

Q.4 (a) Explain briefly : Minimum detectable signal, Blind 03
Speed , Pulse repetition frequency

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(b) Describe Delay line Cancellers for MTI radar. 04
(c) Explain the working of microwave landing system. Write 07
advantages and disadvantage of it.

Q.5 (a) Describe briefly Satellite Constellations. 03
(b) Discuss the relation between effective aperture and 04

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aperture efficiency of radar antenna.
(c) Write GPS principle of operation and explain three major 07
segments of GPS system.

OR

Q.5 (a) A pulse Doppler radar has a carrier frequency of a 9 GHz 03

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and pulse repetition frequency of 4 KHz. Calculate its
blind Doppler frequencies' and radial velocity of target
which would be undetected by the radar.
(b) Calculate the-maximum range in nmi for a radar which 04
operates at 3".cm wavelength with peak power of 500

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kw,if Pmin'is 10"2W the capture area of its antenna is 5
m? and-radar cross section area of target is 20 m?
(c) Explain Adcock Direction Finder and write Its advantages 07
over loop antenna.

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