Exam Details
| Subject | satellite and radar communications | |
| Paper | ||
| Exam / Course | b.tech | |
| Department | ||
| Organization | Vardhaman College Of Engineering | |
| Position | ||
| Exam Date | May, 2018 | |
| City, State | telangana, hyderabad |
Question Paper
Hall Ticket No:
Question Paper Code: A1441
(AUTONOMOUS)B. Tech VIII Semester Supplementary Examinations, May 2018
(Regulations: VCE-R11/R11A)SATELLITE AND RADAR COMMUNICATIONS
(Electronics and Communication Engineering)Date: 01 May, 2018 FN
Time: 3 hours
Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
Unit I
1.
a)Discuss the following concepts of satellite communications:
i. Radio Frequency satellite link (Both up and down)ii. Satellite Transponders
10M
b)Give frequency allocations for satellite services.
5M
2.
a)Explain the operation of Telemetry, Tracking, Command and Monitoring sub-system, with a neat block diagram.
10M
b)Explain the six orbital elements to define a satellite orbit with a neat sketch.
5M
Unit II
3.
a)Explain the basic principle of transmission and reception of Code division multiple access in satellite communications.
8M
b)Explain the frame structure of TDMA traffic burst.
7M
4.
a)From the basics of transmission theory, derive the satellite link formula. Express the formula in decibels.
8M
b)A satellite at a distance of 40,000kms from a point on earth, radiates power of 10W from an antenna with a gain of 17dB in the direction of observer. Find the flux density at the receiving point and the power received by an antenna at this point with an effective area of 10m2 in dBW.
7M
Unit III
5.
a)Derive the radar range equation with all the necessary assumptions, diagrams and equations.
7M
b)Radar mounted on an automobile to be used to determine the distance to a vehicle travelling directly in front of it. The radar operates at a frequency of 9375MHz with a pulse width of 10ns. The maximum range to be 500ft. Find the average power required to detect a 10m2 radar cross section vehicle at a range of 500ft, if the minimum detectable signal is 5x10-13W. The Radar antenna gain is 20dB with an aperture efficiency of 0.7.
8M
6.
a)Explain with a neat block diagram the operation of satellite earth station.
7M
b)List the radar frequencies and applications. Calculate the maximum range of a RADAR system which operates at 3cm with a peak pulse power of 600KW if its minimum receivable power is 10-13W, capture area of its antenna is 5sq.m and the radar cross sectional area of the target is 20sq.m.
8M
Unit IV
7.
a)Explain the operation of CW radar with a neat block diagram and necessary expressions.
8M
b)Calculate the Doppler frequency of a stationary CW Radar Transmitting at 4GHz when a moving target approaches the radar with a radial velocity of 90km/hour.
7M
8.
a)Explain the various types of losses in Radar system.
7M
b)What is range ambiguity? Explain. What should be the PRF of radar in order to achieve a maximum unambiguous range of 60nmi? If the radar has a pulse width of 1.5µs, what is the extent of the pulse energy in space in the range coordinate?
8M
Cont…2
2
Unit V
9.
a)With suitable diagram, Explain the working principle of 2-angle coordinate amplitude comparison Mono pulse tracking radar.
7M
b)Explain about Sequential Lobing technique with a neat diagram.
8M
10.
a)What is the disadvantage of blind speeds in MTI Radar? Suggest some techniques to minimize blind speeds.
7M
b)The MTI Radar is used by a traffic control police to measure the speed of cars. If the Doppler frequency shift measured from the moving car is1.6KHz, calculate the speed of the car. The frequency of operation of the Radar system is 3GHz.
8M
Question Paper Code: A1441
(AUTONOMOUS)B. Tech VIII Semester Supplementary Examinations, May 2018
(Regulations: VCE-R11/R11A)SATELLITE AND RADAR COMMUNICATIONS
(Electronics and Communication Engineering)Date: 01 May, 2018 FN
Time: 3 hours
Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
Unit I
1.
a)Discuss the following concepts of satellite communications:
i. Radio Frequency satellite link (Both up and down)ii. Satellite Transponders
10M
b)Give frequency allocations for satellite services.
5M
2.
a)Explain the operation of Telemetry, Tracking, Command and Monitoring sub-system, with a neat block diagram.
10M
b)Explain the six orbital elements to define a satellite orbit with a neat sketch.
5M
Unit II
3.
a)Explain the basic principle of transmission and reception of Code division multiple access in satellite communications.
8M
b)Explain the frame structure of TDMA traffic burst.
7M
4.
a)From the basics of transmission theory, derive the satellite link formula. Express the formula in decibels.
8M
b)A satellite at a distance of 40,000kms from a point on earth, radiates power of 10W from an antenna with a gain of 17dB in the direction of observer. Find the flux density at the receiving point and the power received by an antenna at this point with an effective area of 10m2 in dBW.
7M
Unit III
5.
a)Derive the radar range equation with all the necessary assumptions, diagrams and equations.
7M
b)Radar mounted on an automobile to be used to determine the distance to a vehicle travelling directly in front of it. The radar operates at a frequency of 9375MHz with a pulse width of 10ns. The maximum range to be 500ft. Find the average power required to detect a 10m2 radar cross section vehicle at a range of 500ft, if the minimum detectable signal is 5x10-13W. The Radar antenna gain is 20dB with an aperture efficiency of 0.7.
8M
6.
a)Explain with a neat block diagram the operation of satellite earth station.
7M
b)List the radar frequencies and applications. Calculate the maximum range of a RADAR system which operates at 3cm with a peak pulse power of 600KW if its minimum receivable power is 10-13W, capture area of its antenna is 5sq.m and the radar cross sectional area of the target is 20sq.m.
8M
Unit IV
7.
a)Explain the operation of CW radar with a neat block diagram and necessary expressions.
8M
b)Calculate the Doppler frequency of a stationary CW Radar Transmitting at 4GHz when a moving target approaches the radar with a radial velocity of 90km/hour.
7M
8.
a)Explain the various types of losses in Radar system.
7M
b)What is range ambiguity? Explain. What should be the PRF of radar in order to achieve a maximum unambiguous range of 60nmi? If the radar has a pulse width of 1.5µs, what is the extent of the pulse energy in space in the range coordinate?
8M
Cont…2
2
Unit V
9.
a)With suitable diagram, Explain the working principle of 2-angle coordinate amplitude comparison Mono pulse tracking radar.
7M
b)Explain about Sequential Lobing technique with a neat diagram.
8M
10.
a)What is the disadvantage of blind speeds in MTI Radar? Suggest some techniques to minimize blind speeds.
7M
b)The MTI Radar is used by a traffic control police to measure the speed of cars. If the Doppler frequency shift measured from the moving car is1.6KHz, calculate the speed of the car. The frequency of operation of the Radar system is 3GHz.
8M
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