Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Summer 8th Sem 2181103 Radar And Navigational Aids Previous Question Paper
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE ? SEMESTER -VIII - EXAMINATION- SUMMER 2020
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.
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
one.
(c) Derive the fundamental form of Radar range equation.
07
Discuss the factors affecting the maximum range of radar
radarradarradarradarradarradar.
Q.2 (a) Explain briefly : Multiple around echoes.
03
(b) Discuss errors and accuracy in DECCA system.
04
(c) Draw the block diagram of MTI radar with power
07
oscillator transmitter and explain its operation.
OR
(c)
De scribe GAGAN and NAVIC receiver system.
07
Discuss the factors affecting the maximum range of
radar.
Q.3 (a) Write advantages and limitations of VOR
03
(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
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.
one
one
1
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
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
(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
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
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
kw,if Pmin is 10-12W,the capture area of its antenna is 5
m2 and radar cross section area of target is 20 m2
(c) Explain Adcock Direction Finder and write Its advantages
07
over loop antenna.
2
This post was last modified on 04 March 2021