Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 8th Semester (Eight Semester) 2017-18 NEC 045 Satellite And Radar Systems Question Paper
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B TECH
(SEM?VIII) THEORY EXAMINATION 2017-18
SATELLITE & RADAR SYSTEMS
T ime: 3 Hours T 0tal Marks: 100
Note: 1. Attempt all Sections.
2. Assume any missing data.
SECTION A
1. Attempt all questions in brief. 2 x10 = 20
What do you mean by false alarm?
Calculate average power when peak power is 200 KW, pulse width is 2 us and rest
time is 2000s.
What do you understand by Blind speed?
What are the limitations of MTI performance?
Explain Low angle tracking in brief.
Why down link frequency should be lower than uplink frequency?
Describe the term Telemetry.
Explain kepler?s law of planetary rotation.
Write Short note on timing Accuracy.
Write Short note on GPS signal levels.
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SECTION B
2. Attempt any three of the following: 10 x 3 = 30
a. Derive radar range equation. Radar is operating at 10GHz with the peak power of
500KW, the power gain of antenna is 5000 & minimum power of the receiver is 10'?.
Calculate the maximum range of radar if the effective area of antenna is 10m2 & radar
cross?section is 4m2.
b. Explain MTI radar with suitable block diagram. Also give its applications. Compare
Pulse Doppler Radar & MTI radar with block diagram.
c. What do you understand by Tracking with radar? Explain Mono pulse tracking in
detail.
d. Derive the general link equation. Find out the expression for C/N and G/T ratio.
e. Explain the basic principle of a GPS system. Explain why a minimum of four
satellites must be Visible at an earth location utilizing the GPS system for position
determination.
SECTION C
3. Attempt any one parts of the following: 10 x 1 = 10
a. What is a duplexer? Explain the operation of a radar duplexer with the help of a
circuit diagram. What is the main limitation of the duplexer? Explain.
b. With the help of schematic block diagram, explain radar transceiver system.
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4. Attempt any one parts of the following: 10 x 1 = 10
a) Explain Delay Line Canceller and Staggered Pulse Repetition Frequencies in detail.
b) Draw the block diagram and explain the operation of CW radar using zero
intermediate frequency in the receiver. How have the drawbacks of the radar been
overcome?
5. Attempt any one parts of the following: 10 x 1 = 10
a) Describe with aid of sketch, the conical scanning method of tracking. How it is
improvement over Lobe switching
b) Explain what is meant by geostationary orbit. How do the geostationary orbit and
geosynchronous orbit differ? Explain how a satellite is placed into a geostationary
orbit?
6. Attempt any one parts of the following: 10 x 1 = 10
a) Derive the expression for overall satellite link design. How a complete satellite link
becomes down link limited? How the overall satellite link design is affected by
intermodulation noise?
b) Discuss about various satellite subsystems highlighting their important functions and
characteristics.
7. Attempt any one parts of the following: 10 x 1 = 10
a) State and explain the different segments of GPS. What is meant by satellite signal
acquisition in GPS?
b) With the help of a suitable block diagram, explain the working of DBS Television
network in detail.
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This post was last modified on 30 January 2020