JNTUWORLD

Code No: R05410409 R05 Set No. 2

IV B.Tech I Semester Examinations,December 2011SATELLITE COMMUNICATIONS

Common to Electronics And Telematics, Electronics And CommunicationEngineering

Time: 3 hours Max Marks: 80Answer any FIVE Questions

All Questions carry equal marks? ? ? ? ?

1. Explain different Satellite links and show how Satellite helps in extending the Cov-erage. [16]

2. (a) Explain the Mobile and Transportable Earth stations.

(b) Write about the Earth stations in Near future. [10+6]

3. (a) Explain the FDMA techniques in detail.

(b) Write the disadvantages of FDMA in satellite communication system. [12+4]

4. Explain how GPS satellite use direct sequence spread spectrum? [16]

5. (a) Draw a neat diagram of Telemetry, Tracking and command and explain theoperation.

(b) What is Transponder? How many transponders are provided in a satellite linkand discuss about the frequencies used in these transponders. [8+8]

6. (a) Explain how maximum instantaneous coverage on the surface of the earth canbe achieved from NGSO.

(b) Illustrate three-cell reuse pattern. [8+8]

7. (a) Prove that the smallest value that the inclination angle can have, is it equal tolatitude of the launch site in the plane of the orbit.

(b) A Satellite is in circular equatorial orbit at an altitude of 10,000 Km from theEarth’s surface. Determine the Maximum Eclipse time in a day during thefull Eclipse period.(Assume any required data). [8+8]

8. (a) Explain Satellite System noise temperature and G/T ratio with necessaryblock diagrams.

(b) A Satellite, located in geosynchronous orbit 38,000Km from an earth stationradiates a power of 10W from an antenna with a gain of 15dB towards theearth station. The effective area of receiving antenna is 10 m2. Find out theflux density and power received at the earth station. [8+8]

? ? ? ? ?

1

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JNTUWORLD

Code No: R05410409 R05 Set No. 4

IV B.Tech I Semester Examinations,December 2011SATELLITE COMMUNICATIONS

Common to Electronics And Telematics, Electronics And CommunicationEngineering

Time: 3 hours Max Marks: 80Answer any FIVE Questions

All Questions carry equal marks? ? ? ? ?

1. (a) Draw a neat diagram of Telemetry, Tracking and command and explain theoperation.

(b) What is Transponder? How many transponders are provided in a satellite linkand discuss about the frequencies used in these transponders. [8+8]

2. (a) Explain the Mobile and Transportable Earth stations.

(b) Write about the Earth stations in Near future. [10+6]

3. (a) Explain Satellite System noise temperature and G/T ratio with necessaryblock diagrams.

(b) A Satellite, located in geosynchronous orbit 38,000Km from an earth stationradiates a power of 10W from an antenna with a gain of 15dB towards theearth station. The effective area of receiving antenna is 10 m2. Find out theflux density and power received at the earth station. [8+8]

4. Explain how GPS satellite use direct sequence spread spectrum? [16]

5. (a) Prove that the smallest value that the inclination angle can have, is it equal tolatitude of the launch site in the plane of the orbit.

(b) A Satellite is in circular equatorial orbit at an altitude of 10,000 Km from theEarth’s surface. Determine the Maximum Eclipse time in a day during thefull Eclipse period.(Assume any required data). [8+8]

6. Explain different Satellite links and show how Satellite helps in extending the Cov-erage. [16]

7. (a) Explain how maximum instantaneous coverage on the surface of the earth canbe achieved from NGSO.

(b) Illustrate three-cell reuse pattern. [8+8]

8. (a) Explain the FDMA techniques in detail.

(b) Write the disadvantages of FDMA in satellite communication system. [12+4]

? ? ? ? ?

2

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JNTUWORLD

Code No: R05410409 R05 Set No. 1

IV B.Tech I Semester Examinations,December 2011SATELLITE COMMUNICATIONS

Common to Electronics And Telematics, Electronics And CommunicationEngineering

Time: 3 hours Max Marks: 80Answer any FIVE Questions

All Questions carry equal marks? ? ? ? ?

1. Explain how GPS satellite use direct sequence spread spectrum? [16]

2. (a) Prove that the smallest value that the inclination angle can have, is it equal to latitude of the launch site in the plane of the orbit.

(b) A Satellite is in circular equatorial orbit at an altitude of 10,000 Km from theEarth’s surface. Determine the Maximum Eclipse time in a day during thefull Eclipse period.(Assume any required data). [8+8]

3. (a) Explain Satellite System noise temperature and G/T ratio with necessaryblock diagrams.

(b) A Satellite, located in geosynchronous orbit 38,000Km from an earth stationradiates a power of 10W from an antenna with a gain of 15dB towards theearth station. The effective area of receiving antenna is 10 m2. Find out theflux density and power received at the earth station. [8+8]

4. (a) Explain the FDMA techniques in detail.

(b) Write the disadvantages of FDMA in satellite communication system. [12+4]

5. (a) Draw a neat diagram of Telemetry, Tracking and command and explain theoperation.

(b) What is Transponder? How many transponders are provided in a satellite linkand discuss about the frequencies used in these transponders. [8+8]

6. (a) Explain the Mobile and Transportable Earth stations.

(b) Write about the Earth stations in Near future. [10+6]

7. Explain different Satellite links and show how Satellite helps in extending the Cov-erage. [16]

8. (a) Explain how maximum instantaneous coverage on the surface of the earth canbe achieved from NGSO.

(b) Illustrate three-cell reuse pattern. [8+8]

? ? ? ? ?

3

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JNTUWORLD

Code No: R05410409 R05 Set No. 3

IV B.Tech I Semester Examinations,December 2011SATELLITE COMMUNICATIONS

Common to Electronics And Telematics, Electronics And CommunicationEngineering

Time: 3 hours Max Marks: 80Answer any FIVE Questions

All Questions carry equal marks? ? ? ? ?

1. (a) Draw a neat diagram of Telemetry, Tracking and command and explain theoperation.

(b) What is Transponder? How many transponders are provided in a satellite linkand discuss about the frequencies used in these transponders. [8+8]

2. Explain different Satellite links and show how Satellite helps in extending the Cov-erage. [16]

3. Explain how GPS satellite use direct sequence spread spectrum? [16]

4. (a) Explain the Mobile and Transportable Earth stations.

(b) Write about the Earth stations in Near future. [10+6]

5. (a) Explain the FDMA techniques in detail.

(b) Write the disadvantages of FDMA in satellite communication system. [12+4]

6. (a) Prove that the smallest value that the inclination angle can have, is it equal tolatitude of the launch site in the plane of the orbit.

(b) A Satellite is in circular equatorial orbit at an altitude of 10,000 Km from theEarth’s surface. Determine the Maximum Eclipse time in a day during thefull Eclipse period.(Assume any required data). [8+8]

7. (a) Explain how maximum instantaneous coverage on the surface of the earth canbe achieved from NGSO.

(b) Illustrate three-cell reuse pattern. [8+8]

8. (a) Explain Satellite System noise temperature and G/T ratio with necessaryblock diagrams.

(b) A Satellite, located in geosynchronous orbit 38,000Km from an earth stationradiates a power of 10W from an antenna with a gain of 15dB towards theearth station. The effective area of receiving antenna is 10 m2. Find out theflux density and power received at the earth station. [8+8]

? ? ? ? ?

4

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