Download GTU B.Tech 2020 Winter 7th Sem 2171007 Satellite Communication Question Paper

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Subject Code: 2171007

GUJARAT TECHNOLOGICAL UNIVERSITY

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Instructions:

1. Attempt any FOUR questions out of EIGHT questions.

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1. Q.1
   1. Explain what is meant by (a) line of apsides and (b) line of nodes. Is it possible for these two lines to be coincident? (03)
   2. Draw and explain the block diagram of satellite communication in detail. (04)
   3. Explain Kepler’s three law of planetary motion with require expression. (07)

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2. Q.2
   1. Explain atmospheric losses for radio wave propagation. (03)
   2. Determine the angle of tilt required for a polar mount used with an earth station at latitude 49° north. Assume a spherical earth of mean radius 6371 km, and ignore earth-station altitude. (04)
   3. By using of equation and figure properly explain the look angle determination of satellite. (07)

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3. Q.3
   1. Define and Explain the terms roll, pitch and yaw. (03)
   2. Write difference between attitude control and orbital control. (04)
   3. Draw and explain the block diagram of satellite transponder in detail. (07)
4. Q.4
   1. Explain what is meant by polarization interleaving. (03)

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   2. Write difference between east-west and north-south station keeping maneuvers. (04)
   3. Write a short note on receive-only home TV system. (07)
5. Q.5
   1. Explain what is meant by the term redundant earth station? (03)
   2. The uplink C/N ratio is 88 dBHz and downlink value is 78 dBHz. Calculate overall C/N ratio: (04)

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   3. What do you mean by multiple access technique? Explain time division multiple access in detail. (07)
6. Q.6
   1. State the type of satellite antenna normally used to produce a wide beam radiation pattern, providing global coverage. How are spot beams produced? (03)
   2. Explain how to compute uplink and downlink C/N ratios for a typical satellite link. (04)
   3. Define downlink. Draw a pictorial representation of a downlink. Show the power budget calculation for a downlink path. (07)

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7. Q.7
   1. How GPS works? (03)
   2. Compare Preassigned FDMA and Demand assigned FDMA. (04)
   3. Write short note on master control station required for direct broadcast satellite television (DSB-TV) system. (07)

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8. Q.8
   1. What is VSAT? (03)
   2. How is error control achieved in Digital DSB TV? (04)
   3. Describe Iridium and Orbcomm satellite systems in detail. (07)

Date: 21/01/2021

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