Satellite Communication And Networks Question Paper - Dec 16 - Electronics And Telecomm (Semester 8)

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Satellite Communication & networks - Dec 16

MU Electronics and Telecom Engineering (Semester 8)

Total marks: 80
Total time: 3 Hours INSTRUCTIONS
(1) Assume appropriate data and state your reasons
a (2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1(a).1 Why does a satellite in highly inclined elliptical orbit spend most of its orbital period over higher latitude regions?

5 marks 6672

1(a).2 Why is it preferable for a remote sensing satellite to be in Sun synchronized orbits?

5 marks 6674

1(b) Explain: 1) Lobe switching 2) mono pulse tracking 3) step tracking 4) intelligent tracking.

5 marks 6689

1(c) Why the control system in satellite waits for an execute command after receiving the command to be execute.

5 marks 6691

1(d) Differentiate between window and frame organization.

5 marks 6846

2(a).1 1) Why a spin stabilized satellite uses relatively large number of solar cells as compared to three axis stabilized satellite for the same power requirement?
2) Why are storage batteries used along with solar arrays?

10 marks 6692

2(a).2 2) Why are storage batteries used along with solar arrays?

10 marks 6693

2(b) What is the antenna noise temperature? What are the major factors that decides the antenna noise temperature? What is the antenna gain to to noise temperature (G/T) ratio? What is the significance of Earth stations antenna gain to noise temperature ratio?

10 marks 6715

3(a) Explain thermal sub-system. What are the methods of thermal control in satellite?

10 marks 6694

3(b) What are the different types of lasers used for satellite communication? Explain photo detector noise model.

10 marks 6847

4(a) With the help of a block diagram describe the working of transmit receive earth station used for telephone traffic.

10 marks 6719

4(b) Explain in detail the operation of the Spade system of demand assignment. Explain what is meant by thin route service? Suggest the type of satellite access is most suitable for this service.

10 marks 6720

5(a) An earth station employs a power amplifier providing an output power of 100W and an antenna 5m diameter for both transmission and reception. The transmission frequency is 6.25GHz and receiving frequency is 4.5 GHz. System noise temperature is 140 K. Find EIRP and G/T ratio.

10 marks 11862

5(b) What is limit of visibility of satellite? How it is calculate?

5 marks 6675

5(c) Explain what is meant by earth eclipse of an earth-orbiting satellite? Why it is preferable to operate with a satellite positioned west rather than east, of earth station longitude?

5 marks 6676

6(a) How the reliability of the earth station is improved?

8 marks 6695

6(b) Draw and explain the satellite network architecture.

8 marks 6848

6(c) Explain Unique word detection

4 marks 11863

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