Exam Details
| Subject | satellite and radar communications | |
| Paper | ||
| Exam / Course | b.tech | |
| Department | ||
| Organization | Vardhaman College Of Engineering | |
| Position | ||
| Exam Date | November, 2017 | |
| City, State | telangana, hyderabad |
Question Paper
(AUTONOMOUS)
B. Tech VIII Semester Supplementary Examinations, November 2017
(Regulations: VCE-R11/R11A)
SATELLITE AND RADAR COMMUNICATIONS
(Electronics and Communication Engineering)
Date: 14 November, 2017 AN
Time: 3 hours
Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
Unit I
1.
Explain how attitude control and station keeping is achieved in a Satellite System.
8M
Space craft subsystems have Telemetry, Tracking and Command unit. From the functionality point of view, explain the role played by these systems.
7M
2.
Discuss about the various orbital effects in communication system performance of a satellite.
7M
Define reliability of a device/subsystem of a satellite. Also elaborate on space qualification models.
8M
Unit II
3.
What does G/T ratio indicate for earth stations? State the important steps in downlink design.
8M
List the advantages and disadvantages of FDMA in satellite communication.
7M
4.
Briefly explain and obtain an expression of the overall system noise temperature of amplifier and communication receiver with cascaded amplifiers.
8M
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.
Explain earth station transmitter and receiver with block diagrams.
8M
Define antenna gain, efficiency, directivity and beam width for satellite antennas.
7M
6.
Explain the applications of RADAR in detail.
8M
Calculate the two-way round trip time when the target is 200km away from RADAR.
7M
Unit IV
7.
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
The moon as a radar target may be described as follows:
Average distance to the moon is 3.844x108m and radar cross section is 6.64x1011m2. What is the round-trip time (seconds) of a radar pulse to the moon and back? What should the PRF be in order to have no range ambiguities?
7M
8.
Prove that the Doppler frequency is half of difference of up and down beat frequencies.
8M
Calculate the Doppler frequency of stationary CW radar transmitting at 4GHz when a moving target approaches the radar with a radial velocity of 90km/hour.
7M
Cont…2
2
Unit V
9.
Compare and contrast the situations with a power amplifier and a power oscillator in the transmitter of an MTI RADAR.
8M
What is the need of Delay line Canceller? Explain about three pulse canceller.
7M
10.
Compare sequential lobing and conical scanning.
8M
Explain in detail about limitation to tracking accuracy.
7M
B. Tech VIII Semester Supplementary Examinations, November 2017
(Regulations: VCE-R11/R11A)
SATELLITE AND RADAR COMMUNICATIONS
(Electronics and Communication Engineering)
Date: 14 November, 2017 AN
Time: 3 hours
Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
Unit I
1.
Explain how attitude control and station keeping is achieved in a Satellite System.
8M
Space craft subsystems have Telemetry, Tracking and Command unit. From the functionality point of view, explain the role played by these systems.
7M
2.
Discuss about the various orbital effects in communication system performance of a satellite.
7M
Define reliability of a device/subsystem of a satellite. Also elaborate on space qualification models.
8M
Unit II
3.
What does G/T ratio indicate for earth stations? State the important steps in downlink design.
8M
List the advantages and disadvantages of FDMA in satellite communication.
7M
4.
Briefly explain and obtain an expression of the overall system noise temperature of amplifier and communication receiver with cascaded amplifiers.
8M
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.
Explain earth station transmitter and receiver with block diagrams.
8M
Define antenna gain, efficiency, directivity and beam width for satellite antennas.
7M
6.
Explain the applications of RADAR in detail.
8M
Calculate the two-way round trip time when the target is 200km away from RADAR.
7M
Unit IV
7.
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
The moon as a radar target may be described as follows:
Average distance to the moon is 3.844x108m and radar cross section is 6.64x1011m2. What is the round-trip time (seconds) of a radar pulse to the moon and back? What should the PRF be in order to have no range ambiguities?
7M
8.
Prove that the Doppler frequency is half of difference of up and down beat frequencies.
8M
Calculate the Doppler frequency of stationary CW radar transmitting at 4GHz when a moving target approaches the radar with a radial velocity of 90km/hour.
7M
Cont…2
2
Unit V
9.
Compare and contrast the situations with a power amplifier and a power oscillator in the transmitter of an MTI RADAR.
8M
What is the need of Delay line Canceller? Explain about three pulse canceller.
7M
10.
Compare sequential lobing and conical scanning.
8M
Explain in detail about limitation to tracking accuracy.
7M
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