# JNTU Kakinada B-Tech 4-2 SATELLITE COMMUNICATION R13 April 2018 Question Paper

IV B.Tech II Semester Regular/Supplementary Examinations, April – 2018
SATELLITE COMMUNICATION (Electronics and Communications Engineering)Time: 3 hours Max. Marks: 70
Question paper consists of Part-A and Part-B
Answer ALL sub questions from Part-A
Answer any THREE questions from Part-B
*****

PART ?A (22 Marks)1. a) Write the Keppler?s laws of planetary motion. [4]
b) Define the azimuth angle. [3]
c) What are the types of rocket motors used on satellites? [3]
d) Define the processing gain. [4]
e) List out the disadvantages of LEO satellites. [4]
f) Write the various applications of GPS. [4]

PART ?B (3×16 = 48 Marks)2. a) Explain the frequency allocations for satellite services. [8]
b) Why the uplink frequency is always greater than the downlink frequency in
satellite communication? Explain.
[8]

3. a) Derive the expression for the time period of satellite?s orbit. [8]
b) A satellite is in an elliptical orbit with a perigee of 1000 km and an apogee of
4000 km. using a mean earth radius of 6378.14 km, find the period of the orbit.
[8]

4. a) What are the various subsystems in the satellite? Explain the power system. [8]
b) Explain the redundancy type of approach used for improving reliability in
satellite.
[8]

5. a) What is G/T ratio of a satellite link? Derive the expression for it. [8]
b) Explain the principle of CDMA with an example. [8]

6. a) Draw the general configuration of an earth station and explain each block. [8]
b) What are the different satellite constellation designs? Explain any one. [8]

7. a) Explain the operation of GPS receiver. [8]
b) Write short note on GPS C/A code accuracy. [8]

Code No: RT42043A
Set No. 1
R13
1 of 1

IV B.Tech II Semester Regular/Supplementary Examinations, April – 2018
SATELLITE COMMUNICATION (Electronics and Communications Engineering)Time: 3 hours Max. Marks: 70
Question paper consists of Part-A and Part-B
Answer ALL sub questions from Part-A
Answer any THREE questions from Part-B
*****

PART ?A (22 Marks)1. a) Write the Keppler?s laws of planetary motion. [4]
b) Define the azimuth angle. [3]
c) What are the types of rocket motors used on satellites? [3]
d) Define the processing gain. [4]
e) List out the disadvantages of LEO satellites. [4]
f) Write the various applications of GPS. [4]

PART ?B (3×16 = 48 Marks)2. a) Explain the frequency allocations for satellite services. [8]
b) Why the uplink frequency is always greater than the downlink frequency in
satellite communication? Explain.
[8]

3. a) Derive the expression for the time period of satellite?s orbit. [8]
b) A satellite is in an elliptical orbit with a perigee of 1000 km and an apogee of
4000 km. using a mean earth radius of 6378.14 km, find the period of the orbit.
[8]

4. a) What are the various subsystems in the satellite? Explain the power system. [8]
b) Explain the redundancy type of approach used for improving reliability in
satellite.
[8]

5. a) What is G/T ratio of a satellite link? Derive the expression for it. [8]
b) Explain the principle of CDMA with an example. [8]

6. a) Draw the general configuration of an earth station and explain each block. [8]
b) What are the different satellite constellation designs? Explain any one. [8]

7. a) Explain the operation of GPS receiver. [8]
b) Write short note on GPS C/A code accuracy. [8]

Code No: RT42043A
Set No. 1
R13
1 of 1

IV B.Tech II Semester Regular/Supplementary Examinations, April – 2018
SATELLITE COMMUNICATION (Electronics and Communications Engineering)Time: 3 hours Max. Marks: 70
Question paper consists of Part-A and Part-B
Answer ALL sub questions from Part-A
Answer any THREE questions from Part-B
*****

PART ?A (22 Marks)1. a) Define perigee of a satellite. [3]
b) What is an elevation angle? [4]
c) List out the main types of antennas used on satellite. [4]
d) Define Intermodulation. [3]
e) What are the various types of power amplifiers used at satellite earth station? [4]
f) What are the different functions of GPS? [4]

PART ?B (3×16 = 48 Marks)2. a) What are the different segments in satellite architecture? Explain. [8]
b) Why the uplink and downlink frequencies are different? Explain. [8]

3. a) Define the azimuth angle and derive the expression for it. [8]
b) Describe the history of satellite launch vehicles. [8]

4. a) Explain the TTC&M satellite subsystem with a neat diagram. [10]
b) Describe the functions of satellite communication subsystem. [6]

5. a) Derive the expression for system noise temperature of a satellite link. [8]
b) Explain the frame structure of TDMA with a neat sketch. [8]

6. a) Explain the operation of earth station receiver with the help of a neat block
diagram.
[8]
b) Explain the delay considerations of LEO, MEO and GEO satellites. [8]

7. a) Explain the generation of GPS signals with a neat sketch. [8]
b) Explain the principle of differential GPS. [8]

Code No: RT42043A
Set No. 2
R13
1 of 1

IV B.Tech II Semester Regular/Supplementary Examinations, April – 2018
SATELLITE COMMUNICATION (Electronics and Communications Engineering)Time: 3 hours Max. Marks: 70
Question paper consists of Part-A and Part-B
Answer ALL sub questions from Part-A
Answer any THREE questions from Part-B
*****

PART ?A (22 Marks)1. a) Write the Keppler?s laws of planetary motion. [4]
b) Define the azimuth angle. [3]
c) What are the types of rocket motors used on satellites? [3]
d) Define the processing gain. [4]
e) List out the disadvantages of LEO satellites. [4]
f) Write the various applications of GPS. [4]

PART ?B (3×16 = 48 Marks)2. a) Explain the frequency allocations for satellite services. [8]
b) Why the uplink frequency is always greater than the downlink frequency in
satellite communication? Explain.
[8]

3. a) Derive the expression for the time period of satellite?s orbit. [8]
b) A satellite is in an elliptical orbit with a perigee of 1000 km and an apogee of
4000 km. using a mean earth radius of 6378.14 km, find the period of the orbit.
[8]

4. a) What are the various subsystems in the satellite? Explain the power system. [8]
b) Explain the redundancy type of approach used for improving reliability in
satellite.
[8]

5. a) What is G/T ratio of a satellite link? Derive the expression for it. [8]
b) Explain the principle of CDMA with an example. [8]

6. a) Draw the general configuration of an earth station and explain each block. [8]
b) What are the different satellite constellation designs? Explain any one. [8]

7. a) Explain the operation of GPS receiver. [8]
b) Write short note on GPS C/A code accuracy. [8]

Code No: RT42043A
Set No. 1
R13
1 of 1

IV B.Tech II Semester Regular/Supplementary Examinations, April – 2018
SATELLITE COMMUNICATION (Electronics and Communications Engineering)Time: 3 hours Max. Marks: 70
Question paper consists of Part-A and Part-B
Answer ALL sub questions from Part-A
Answer any THREE questions from Part-B
*****

PART ?A (22 Marks)1. a) Define perigee of a satellite. [3]
b) What is an elevation angle? [4]
c) List out the main types of antennas used on satellite. [4]
d) Define Intermodulation. [3]
e) What are the various types of power amplifiers used at satellite earth station? [4]
f) What are the different functions of GPS? [4]

PART ?B (3×16 = 48 Marks)2. a) What are the different segments in satellite architecture? Explain. [8]
b) Why the uplink and downlink frequencies are different? Explain. [8]

3. a) Define the azimuth angle and derive the expression for it. [8]
b) Describe the history of satellite launch vehicles. [8]

4. a) Explain the TTC&M satellite subsystem with a neat diagram. [10]
b) Describe the functions of satellite communication subsystem. [6]

5. a) Derive the expression for system noise temperature of a satellite link. [8]
b) Explain the frame structure of TDMA with a neat sketch. [8]

6. a) Explain the operation of earth station receiver with the help of a neat block
diagram.
[8]
b) Explain the delay considerations of LEO, MEO and GEO satellites. [8]

7. a) Explain the generation of GPS signals with a neat sketch. [8]
b) Explain the principle of differential GPS. [8]

Code No: RT42043A
Set No. 2
R13
1 of 1

IV B.Tech II Semester Regular/Supplementary Examinations, April – 2018
SATELLITE COMMUNICATION (Electronics and Communications Engineering)Time: 3 hours Max. Marks: 70
Question paper consists of Part-A and Part-B
Answer ALL sub questions from Part-A
Answer any THREE questions from Part-B
*****

PART ?A (22 Marks)1. a) Define apogee of a satellite. [3]
b) What are the various orbital elements? [4]
c) What are the differences between the geosynchronous and geostationary orbits? [4]
d) Compare FDMA, TDMA and CDMA. [4]
e) Define throughput. [3]
f) What are the limitations of GPS? [4]

PART ?B (3×16 = 48 Marks)2. a) Explain the history of Indian satellite communications. [8]
b) Describe the various frequencies used for satellite communications. [8]

3. a) Define the elevation angle and derive the expression for it. [8]
b) What are the various types of satellite launch vehicles? Explain. [8]

4. a) Explain the altitude and orbit control system (AOCS) with necessary diagrams. [8]
b) What are the various approaches used to improve the reliability of the satellite?
Explain any one.
[8]

5. a) What is satellite link equation? Derive the expression for it. [8]
b) Explain the principle FDMA with a neat diagram. [8]

6. a) What are the different types of antenna mounts used at earth station? Explain. [8]
b) Compare the low earth orbit and geostationary satellite systems. [8]

7. a) Explain the functions of control segment in GPS. [8]
b) Describe the various sources of errors in GPS. [8]

Code No: RT42043A
Set No. 3
R13
1 of 1

IV B.Tech II Semester Regular/Supplementary Examinations, April – 2018
SATELLITE COMMUNICATION (Electronics and Communications Engineering)Time: 3 hours Max. Marks: 70
Question paper consists of Part-A and Part-B
Answer ALL sub questions from Part-A
Answer any THREE questions from Part-B
*****

PART ?A (22 Marks)1. a) Write the Keppler?s laws of planetary motion. [4]
b) Define the azimuth angle. [3]
c) What are the types of rocket motors used on satellites? [3]
d) Define the processing gain. [4]
e) List out the disadvantages of LEO satellites. [4]
f) Write the various applications of GPS. [4]

PART ?B (3×16 = 48 Marks)2. a) Explain the frequency allocations for satellite services. [8]
b) Why the uplink frequency is always greater than the downlink frequency in
satellite communication? Explain.
[8]

3. a) Derive the expression for the time period of satellite?s orbit. [8]
b) A satellite is in an elliptical orbit with a perigee of 1000 km and an apogee of
4000 km. using a mean earth radius of 6378.14 km, find the period of the orbit.
[8]

4. a) What are the various subsystems in the satellite? Explain the power system. [8]
b) Explain the redundancy type of approach used for improving reliability in
satellite.
[8]

5. a) What is G/T ratio of a satellite link? Derive the expression for it. [8]
b) Explain the principle of CDMA with an example. [8]

6. a) Draw the general configuration of an earth station and explain each block. [8]
b) What are the different satellite constellation designs? Explain any one. [8]

7. a) Explain the operation of GPS receiver. [8]
b) Write short note on GPS C/A code accuracy. [8]

Code No: RT42043A
Set No. 1
R13
1 of 1

IV B.Tech II Semester Regular/Supplementary Examinations, April – 2018
SATELLITE COMMUNICATION (Electronics and Communications Engineering)Time: 3 hours Max. Marks: 70
Question paper consists of Part-A and Part-B
Answer ALL sub questions from Part-A
Answer any THREE questions from Part-B
*****

PART ?A (22 Marks)1. a) Define perigee of a satellite. [3]
b) What is an elevation angle? [4]
c) List out the main types of antennas used on satellite. [4]
d) Define Intermodulation. [3]
e) What are the various types of power amplifiers used at satellite earth station? [4]
f) What are the different functions of GPS? [4]

PART ?B (3×16 = 48 Marks)2. a) What are the different segments in satellite architecture? Explain. [8]
b) Why the uplink and downlink frequencies are different? Explain. [8]

3. a) Define the azimuth angle and derive the expression for it. [8]
b) Describe the history of satellite launch vehicles. [8]

4. a) Explain the TTC&M satellite subsystem with a neat diagram. [10]
b) Describe the functions of satellite communication subsystem. [6]

5. a) Derive the expression for system noise temperature of a satellite link. [8]
b) Explain the frame structure of TDMA with a neat sketch. [8]

6. a) Explain the operation of earth station receiver with the help of a neat block
diagram.
[8]
b) Explain the delay considerations of LEO, MEO and GEO satellites. [8]

7. a) Explain the generation of GPS signals with a neat sketch. [8]
b) Explain the principle of differential GPS. [8]

Code No: RT42043A
Set No. 2
R13
1 of 1

IV B.Tech II Semester Regular/Supplementary Examinations, April – 2018
SATELLITE COMMUNICATION (Electronics and Communications Engineering)Time: 3 hours Max. Marks: 70
Question paper consists of Part-A and Part-B
Answer ALL sub questions from Part-A
Answer any THREE questions from Part-B
*****

PART ?A (22 Marks)1. a) Define apogee of a satellite. [3]
b) What are the various orbital elements? [4]
c) What are the differences between the geosynchronous and geostationary orbits? [4]
d) Compare FDMA, TDMA and CDMA. [4]
e) Define throughput. [3]
f) What are the limitations of GPS? [4]

PART ?B (3×16 = 48 Marks)2. a) Explain the history of Indian satellite communications. [8]
b) Describe the various frequencies used for satellite communications. [8]

3. a) Define the elevation angle and derive the expression for it. [8]
b) What are the various types of satellite launch vehicles? Explain. [8]

4. a) Explain the altitude and orbit control system (AOCS) with necessary diagrams. [8]
b) What are the various approaches used to improve the reliability of the satellite?
Explain any one.
[8]

5. a) What is satellite link equation? Derive the expression for it. [8]
b) Explain the principle FDMA with a neat diagram. [8]

6. a) What are the different types of antenna mounts used at earth station? Explain. [8]
b) Compare the low earth orbit and geostationary satellite systems. [8]

7. a) Explain the functions of control segment in GPS. [8]
b) Describe the various sources of errors in GPS. [8]

Code No: RT42043A
Set No. 3
R13
1 of 1

IV B.Tech II Semester Regular/Supplementary Examinations, April – 2018
SATELLITE COMMUNICATION (Electronics and Communications Engineering)Time: 3 hours Max. Marks: 70
Question paper consists of Part-A and Part-B
Answer ALL sub questions from Part-A
Answer any THREE questions from Part-B
*****

PART ?A (22 Marks)1. a) Define subsatellite point of a satellite. [4]
b) What is Doppler frequency shift? Write the expression for it. [4]
c) What is a transponder? What are its types? [3]
d) Write the formula to find the overall C/N ratio in a satellite when the uplink and
downlink C/N ratio are given.
[3]
e) What are the future trends of satellite communications? [4]
f) What are the different sources of GPS errors? [4]

PART ?B (3×16 = 48 Marks)2. a) Explain the architecture of a satellite communication system. [8]
b) Explain the various applications of satellite communications. [8]

3. a) What are the various satellite launch vehicle selection factors? Explain them. [8]
b) Explain the various orbital effects in satellite communication systems
performance.
[8]

4. a) What are the various forces acting on the satellite? Explain. [8]
b) Explain the transponder for use in 14/11 GHz band with the help of a neat
diagram.
[8]

5. a) Derive the expression for C/N ratio in a satellite link. [8]
b) Low earth orbit satellites use mainly L band, with ranges varying from 1000 km
to 2500 km. Calculate the maximum and minimum path loss from earth to a
satellite, in dB, for the uplink frequency of 1.6 GHz and down link frequency of
1.5 GHz.

[8]

6. a) Explain the operation of earth station transmitter with the help of a neat block
diagram.
[8]
b) Explain the throughput considerations of LEO, MEO and GEO satellites. [8]

7. a) Draw the block diagram of GPS receiver and explain its operation. [8]
b) Explain the GPS position location principles. [8]

Code No: RT42043A
Set No. 4
R13
1 of 1

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