Download GTU B.Tech 2020 Winter 7th Sem 2173207 Satellite Communication And Networking Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-VII (NEW) EXAMINATION - WINTER 2020

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Instructions:

1. Attempt any FOUR questions out of EIGHT questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

MARKS

1. (a) What are the advantages of Satellite Communication? 03
   (b) Explain the Keplerian element set. 04
   

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   (c) Explain asynchronous transfer mode in detail. 07
2. (a) A geostationary Satellite is located at 90° W. Calculate azimuth 03
   angle for An earth station antenna is located at latitude 35°N and
   longitude 100°W.
   (b) Draw and explain the block diagram of satellite communication in 04
   

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   detail.
   (c) Write a short note on the solar eclipse of satellite and sun transit 07
   outage.
3. (a) Explain atmospheric losses in detail. 03
   (b) A satellite in an elliptical orbit around the earth has an apogee of 04
   

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   39,152 km and a perigee of 500 km. What is the orbital period of the
   satellite? Average earth radius is 6,378.137 km.
   (c) Explain the block diagram of Satellite Transponder. Also explain the 07
   frequency reuse technique for Transponder.
4. (a) Describe the following terms of Earth orbiting satellites 03
   

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   (1) Ascending node (2) line/of apsides (3)Retrograde orbit
   (b) Write a Short note on Atmospheric Drag. 04
   (c) What is the purpose of Telemetry, Tracking, Command in satellite 07
   communication? Explain in detail.
5. (a) Differentiate XPD and Polarization Isolation. 03
   

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   (b) What is Free space loss? The range between a ground station and a 04
   satellite is 42,000 km. Calculate the free-space loss at a frequency of
   6 GHz.
   (c) Write a short note on TCP Link. 07
6. (a) Write differences between: Attitude control and orbital control 03
   

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   (b) Write a note on Rain depolarization. 04
   (c) Write short notes on Demand Access Multiple Access system. 07
7. (a) Write a short note on Master Antenna TV Systems. 03
   (b) What is meant by rain attenuation? Derive an equation for the same. 04
   (c) Explain how to compute uplink and downlink C/N ratio for a typical 07
   

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   satellite link.
8. (a) A earth station have equivalent noise temperature of 200° K, noise 03
   bandwidth of 18 MHz, antenna gain of 50dB and carrier frequency
   of 12 GHz Determine, Gain to Equivalent Noise temperature ratio,
   Noise density, and Total Noise Power.
   

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   (b) Write a short on various losses in uplink transmission. 04
   (c) What are the differences between multiplexing and multiple access 07
   techniques? Explain briefly Code division multiple access.

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