Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech IV SATELLITE COMMUNICATIONS Previous Question Paper (May - 2019 - R15)
Part A is compulsory. Part B consists of 5 Units. Answer any one full question from each unit.
Part A
Define ascending node and argument of perigee.
Answer
The ascending node is the point where the satellite crosses the equatorial plane moving from the Southern Hemisphere to the Northern Hemisphere. The argument of perigee is the angle measured from the ascending node to the perigee point in the direction of the satellite's motion, defining the orientation of the orbit's ellipse in the orbital plane.
List various frequency ranges used for satellite communication.
Answer
Common frequency bands used in satellite communication include:
- L-band: 1 to 2 GHz
- S-band: 2 to 4 GHz
- C-band: 4 to 8 GHz
- X-band: 8 to 12 GHz
- Ku-band: 12 to 18 GHz
- Ka-band: 26.5 to 40 GHz
An amplifier has a quoted noise figure of 3 dB. What is its equivalent noise temperature?
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What are the advantages of GPS system?
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What is satellite packet switching?
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Compare TDMA and FDMA.
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What are the various signals transmitted by GPS satellites?
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What are the features of GPS?
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List out the advantages and disadvantages in positioning satellite in lower orbit.
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Describe the Pure ALOHA scheme.
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Part B
Explain various reasons for orbital perturbation which effects the satellite communication.
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Describe Geostationary Transfer Orbit and AKM with neat diagrams.
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Describe Geostationary Transfer Orbit with slow orbit raising with neat diagrams.
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Explain about Attitude and Orbit Control System in detail.
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Explain system noise temperature and G/T ratio in detail.
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Explain various phenomena that leads to signal loss on transmission through the earth’s atmosphere.
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Explain TDMA and its frame structure with neat diagrams.
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What are the different types of demand assignment multiple Access characteristics?
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Draw the transmitter and receiver block diagrams of an earth station and explain its working.
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What is GPS? Describe the principle of GPS to find the position of a user.
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Define Packet and explain in detail about Packet Reservation.
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Discuss message transmission by FDMA.
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Write short notes on:
Message transmission by TDMA.
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Tree algorithm.
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