Punjab University 2005 B.Tech Electronics and Communications Engineering RADAR SYSTEM & NAVIGATION - Question Paper

RADAR SYSTEM & NAVIGATION

Max Marks 60

Time three Hours

NOTE:- This paper consist of 3 parts. part A is compulsory. Do any 4 ques. from
part B and any 2 ques. from part C

Section-A Marks : 10 * 2=20

1(a) Enlist the factors that determine the detection range of a radar.
(b) State the Doppler effect. HOw is it used for radar applications?
(c) Sketch the block diagram of FM-CH radar.
(d) What is staggered PRF? discuss.
(e) How does an active electronic counter measure decrease the detection range of a radar?
(f) elaborate the possible errors in direction finding in radar systems? discuss.
(g) provide the various acquisition search trends for tracking radar.
(h) discuss the pulse comparison mono pulse technique for tracking.
(i) Enlist the characteristics features of an true radar systems.
(j) How does integration of radar pulses improve the detection performance of a radar? discuss.

Section-B Marks:5 every

2. Consider an S-band pulsed radar with the subsequent parameters:
Peak transmitted power = 300kW.
Pulse width = one user.
PRF = 600Hz.
Antenna radius = 6ft.
Transmitted frequency = 3000MHz.
Transmit loss = 6dB.
Antenna efficiency = 0.95
compute the maximum signal power at the range of 50 nauticals miles.
3. An altimeter using FM has a modulation frequency of 200 Hz. and a frequency excursion of 60 MHz. compute the
modulation slope which will outcome in a range quantization of 10 KM.
4. Consider a radar with multiple PRF ranging using f1 = 13.770 kHz and f2 = 14.580 kHz. compute the need of multiple PRF.
5. Write a brief tech. note on an true radar system.
6. elaborate Electronic Counter Measures? define a typical adopted for this measure.

Section-C Marks : 10 every

7. With the help of a block diagram, discuss the working of a conical scan tracking radar.
8. explain the blind speed situation in an MTI radar. Derive the formula for blind speeds for the case of a single delay
line canceles. In a 5 pulse stragger (four periods) in a long range airtraffic control radar, the periods are in the ratio
25 : 30 : 27 : 31. How many times the 1st blind speed would became as compared to that of a constant PRF waveform
with the identical avg. period.
9. explain instrument landing System in detail.

Earning:   Approval pending.