Punjab Technical University 2005-7th Sem B.Tech Electronics and Communications Engineering RADAR SYSTEM AND NAVIGATION ( 6th & ester,2122) - Question Paper

RADAR SYSTEM AND NAVIGATION (B.Tech sixth & seventh Semester,2122)
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 : 20

1(a) A radar is expected to have a range of 100 km. What is the maximum alloable pulse repetition frequency
for unambiguous reception ?
(b) Differentiate ranging from A, B and PPI displays.
(c) Draw the block diagram of a CW dopper radar.
(d) For a radar, peak transmitted power is one MW, pulse width is one µ sec and PRF is 1kHz. compute the avg.
transmitted power.
(e) State Doppler principle for velocity determination.
(f) discuss sub-clutter visibility.
(g) Show various radar antenna trends for target acquisition.
(h) What is noise jamming as reffered to ECM (Electronic Counter Measures) ?
(i) provide the outline of LORAN.
(j) State the functions of Ground Controlled Approach.

Section-B Marks:5 every

2. discuss the principle of working of a FM-CW radar. How will you replace if for using as an altimeter?
3. Write a tech. note on satellite based Navigation System.
4. Draw the block diagram of a 2 coordinate amplitude comarision monopulse tracking radar and discuss the
working of various subsystems.
5. discuss the integration of radar pulses. For a ground-based search radar, pulse repetition frequency is 300 Hz,
beam is 1.5o, and antenna scan rate is five r.p.m. compute the number of hits from a point target on every scan.
6. Mention the special features of an true radar system. discuss its working in Brief.

Section-C Marks : 10 every

7. Consider a millimeter wave radar with the subsequent parameters:
Transmitted pulse power, P1 = 3kW
Pulse repetition frequency, PRF = 1000 pps
Pulse width t = 5010-9 sec.
Diameter of antenna D = 1ft.
Radar cross-section of target,s = 30 mt2
k = i.38x10/-23 J/K
Absolute temperature, T = 1467.93oK
System loss Ls = 10 dB
S/N = 10dB
Azimuth scan = +- 30o
Elevation scan = 2o
Target scan time, ts = four sec.
Determine the maximum unambiguous range of the radar operating at a frequency of 10 GHz.
8. With the hepl of block diagram, discuss the working of an MTI radar. An MTI radar is operating with a frequency
of 450 MHz. if an aircraft is approaching with a speed of 200 m/sec and remains undetected, what can be the
pulse repetition frequency of the radar?
9. elaborate the requirements of an ECCM? Draw the block diagram of an ECCM system and tag the various blocks
clearly. define its working. (ECCM = Electronic Counter Counter Measures).

Earning:   Approval pending.