Download GTU BE/B.Tech 2019 Winter 7th Sem New 2173207 Satellite Communication And Networking Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER- VII (New) EXAMINATION — WINTER 2019

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Subject Code: 2173207 Date: 26/11/2019

Subject Name: Satellite Communication & Networking

Time: 10:30 AM TO 01:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

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

Q.1

1. (a) List the orbital elements and explain each of them. 03
2. (b) Which are the advantages of satellite communication? 04

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3. (c) Explain Kepler’s three laws with necessary diagram and equations. 07

Q.2

1. (a) Define :(1) Eccentricity (2) Perigee (3) Apogee 03
2. (b) Describe earth’s oblateness, sun & moon’s effects on artificial satellite orbit? 04
3. (c) Calculate the radius of a circular orbit for which the period is 1 day. 07

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OR

1. (a) An earth station is located at latitude of 12° south and longitude 52° west. Calculate the antenna look angle for a satellite at70° W. 07

Q.3

1. (a) Explain Cross-Polarization Discrimination. 03
2. (b) What are atmospheric losses? 04

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3. (c) By using of equation and figure properly explain the look angle determination of satellite. 07

OR

1. (a) Explain the phenomenon of scintillation: 03
2. (b) Differentiate between XPD and Polarization Isolation. 04
3. (c) Explain what is meant by effective path length in connection with rain attenuation. 07

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Q.4

1. (a) What is uplink? Draw and explain block diagram. 03
2. (b) Write a short note on attitude control system. 04
3. (c) Draw and explain block diagram of telemetry, tracking, command and monitoring system for communication satellite. 07

OR

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1. (a) What is downlink? Draw and explain block diagram. 03
2. (b) Draw block diagram for transmit receive type earth station. 04
3. (c) Draw and Explain the block diagram of satellite transponder in detail. 07

Q.5

1. (a) List the advantage and disadvantage of FDMA multiple access techniques. 04

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2. (b) The uplink C/NO ratio is 88dBHz and downlink value is 78dBHz. Calculate overall C/NO. 07

OR

1. (a) Describe briefly the difference between ATM digital cross connect switch and ATM switch. 04
2. (b) Explain all the steps to follow for Uplink power budget preparation. 07
3. (c) Explain block diagram of Code Division multiple Access in detail. 07

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