Jawaharlal Nehru Technological University Anantapur 2009 B.Tech Electronics and Communications Engineering ece -university question paper
for ece
Code No: 37034 SET-1
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD R05 IV B.Tech. I Semester Supplementary Exams, May/June - 2009
RADAR SYSTEMS
(Common to ECE & ETM)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions.
All Questions carries equal marks.
1 a) Derive the maximum range for a radar system from first principles.
b) Explain the applications of radar. [8+8]
2 a) Write explanatory notes on:
i) Minimum detectable signal
ii) False alarm
iii) Missed detection. b) Explain the following:
i) Pulse repetition frequency
ii) Range ambiguities. [16]
3 a) For an unambiguous range of 81 nautical miles (1 nautical mile = 1852 m) in a two frequency CW radar . Determine f2 and Af when f1 = 4.2 kHz . Derive the expression to solve his problem. b) Explain the operation of CW Doppler radar non zero IF with neat block diagram.
[10+6]
4 a) Explain the principle of operation of FMCW altimeter with suitable diagram. b) Explain how the noise signals are limiting the performance of FMCW altimeter.
[10+6]
5 a) Explain the principle of operation of MTI radar with power amplifier transmitter
with neat block diagram. b) What is butterfly effect? What are its advantages. [10+6]
6 a) Compare tracking techniques.
b) Explain the principle of operation of phase comparison monopulse tracking radar.
[10+6]
7 a) What is a matched filter receiver? Draw its response characteristics.
b) Describe the operation of matched filter with non white noise. [8+8]
8 ) Explain the following:
i) Branch type duplexer
ii) Balanced type duplexer
iii) Receiver protectors. [16]
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD R05 IV B.Tech. I Semester Supplementary Exams, May/June - 2009
RADAR SYSTEMS
(Common to ECE & ETM)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions.
All Questions carries equal marks.
1 a) Obtain the radar equation and discuss various parameters which improve the performance of radar b) A pulsed radar operating at 10 GHz has an antenna with a gain of 28dB and a transmitter of 2 KW ( pulse power). If it is defined to detect a target with a cross section of 12 sq. m. and the minimum detectable signal is -90 dBm . What is the maximum range of the radar. [8+8]
2 a) Explain detection of signals in noise.
b) Describe different noise components present in radar systems. [8+8]
3 a) Define Doppler effect. Explain how it is used in CW radar
b) Explain how isolation between transmitter and receiver is obtained in CW radar.
[8+8]
4 a) Explain the principle of operation of FMCW altimeter with suitable diagram.
b) Describe the operation of multiple frequency CW radar. [10+6]
5 a) Explain the principle of operation of MTI radar with power oscillator transmitter
with neat block diagram. b) Discuss about blind speeds. [10+6]
6 a) Explain in detail about the limitations to tracking accuracy.
b) Explain the operation of amplitude comparison monopulse tracking radar with the help of a block diagram. [6+10]
7 a) Derive the matched filter characteristic.
b) Discuss about efficiency of non-matched filters. [10+6]
8 a) Write notes on various displays.
b) Explain the operation of branch type duplexer with neat sketch. [10+6]
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD R05 IV B.Tech. I Semester Supplementary Exams, May/June - 2009
RADAR SYSTEMS
(Common to ECE & ETM)
Time: 3 hours
Max Marks: 80
Answer any FIVE Questions. All Questions carries equal marks.
1 a) Obtain the radar equation and discuss various parameters which improve the performance of radar.
Draw the simple radar block diagram and explain its operation. [8+8]
b)
2)
Write explanatory notes on:
i) Pulse repetition frequency and range ambiguities
ii) System losses.
3 a) Define Doppler effect. Explain the operation of simple CW radar with block
diagram. List its applications. b) Write about the necessity of using filter banks in CW radar receiver. [10+6]
4 a) Explain the operation of sinusoidally modulated FMCW radar extracting the third
harmonic with neat block diagram. b) Explain the operation of multiple frequency CW radar. [10+6]
5 a) Discuss about staggered pulse repetition frequencies.
b) Explain the principle of operation of MTI radar using range gates and filters.
[8+8]
6 a) Compare sequential lobing and conical scanning.
b) Explain in detail about limitations to tracking accuracy.
[8+8]
[8+8]
[16]
7 a) Derive the matched filter characteristic.
b) Discuss about matched filter and correlation function.
8 a) Write notes on:
i) noise figure
ii) noise temperature.
b) Explain any two types of mixers.
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD R05 IV B.Tech. I Semester Supplementary Exams, May/June - 2009
RADAR SYSTEMS
(Common to ECE & ETM)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions.
All Questions carries equal marks.
1 a) A pulsed radar operating at 10 GHz has an antenna with a gain of 28dB and a transmitter of 2 KW (pulse power). If it is defined to detect a target with a cross section of 12 sq. m. and the minimum detectable signal is -90 dBm . What is the maximum range of the radar. b) Explain about the applications of radar. [8+8]
2) Write explanatory notes on:
i) Receiver noise
ii) Signal to noise ratio
iii) Radar cross section of targets. [16]
3 a) Explain the principle of operation of CW Doppler radar with non zero
IF receiver.
b) Explain the mechanism of finding target direction. [8+8]
4 a) Explain how range and Doppler measurements are performed using
FMCW radar.
b) Discuss about measurement errors. [8+8]
5) Write notes on the following:
i) Delay line cancellers
ii) Blind speeds
iii) Clutter attenuation
iv) Transversal filters. [16]
6) Explain the following:
i) Low angle tracking
ii) Tracking in range
iii) Acquisition. [16]
Contd....[2]
[Set-4]
7 a) Derive the equation for impulse response of a matched filter b) Write short notes on
i) Efficiency of non matched filters.
[8+8]
[8+8]
ii) Matched filter with non white noise.
8 a) What is low noise front end? What are its applications. b) Explain the following:
i) Balanced type duplexer
ii) Branch type duplexer.
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