SRM University 2007 B.Tech Electronics and Communications Engineering Bank : Satellite Communication

15. Explain the need for back-off.
16. Give the expression for thermal noise power.
17. Write note on antenna misalignment losses.
18. Give the expression for FSL.
19. Define antenna noise.
20. Give the expression for G/T ratio and its use.
21. Give the expression for PHPA and PTWTA.
22. Define intermodulation noise.
23. Define thermal noise.

PART-B
1. Write notes on atmospheric absorption and scintillation at troposphere and ionosphere.
2. Write notes on rain attenuation and derive the expression for the identical.
3. Describe the Faraday rotation in the ionosphere and rain depolarization.
4. Explain briefly what is meant by sun transit outage and earth eclipse.
5. Derive the link power budget formula.
6. Derive the expression for overall system noise temperature.
7. Derive the expression for C/N for uplink.
8. Derive the expression for C/N for downlink.
9. Describe the effects of rain and intermodulation noise on C/N ratio.
10. a) Write notes on frequency of operation.
b) Derive the expression for combined uplink/downlink C/N ratio.

UNIT-III
PART-A
1. What is spacecraft bus?
2. List out the spacecraft subsystems?
3. What is spacecraft payload?
4. List out the causes for variations in solar power output.
5. What are the techniques for voltage regulation?
6. Define the function of power subsystem.
7. List out the factors for thermal variation during spacecraft launching phase.
8. List out the factors for thermal variation during spacecraft operational phase.
9. Define the function of thermal subsystem.
10. Give the Stefan-Boltzman formula for heat radiation.
11. Derive the formula for spacecraft temperature.
12. List out the thermal control techniques.
13. Define the function of AOCS.
14. List out the attitude and Orbit Control Electronics.
15. List out the disturbance torques that causes driff in attitude.
16. What are the techniques for attitude control?
17. List out the different techniques for generation of correction torque / stabilization.
18. Define the function of telemetry subsystem.
19. List out few parameters measured by telemetry subsystem.
20. Give few examples of commands used for TTC.
21. List out the techniques for tracking a satellite.
22. What are the various kinds of transponders?
23. What is transponder?
24. What is transparent transponder?
25. What is regenerative transponder?
26. Differentiate global coverage spot beam coverage?
27. Name the antenna system that can be used for global coverage.
28. Name the antenna system for spot beam coverage.
29. Name the antenna system for complex coverage area.
30. List out the optimization parameters for coverage area.
31. List out the subsystems of earth station.
32. List out the parameters for selection of LNA.

PART-B
1. Describe spacecraft subsystem with diagram.
2. Explain spacecraft power subsystem.
3. Discuss the attitude, orbit and control (AOCS) subsystem of spacecraft.
4. Describe Telemetry, Tracking and command subsystem of spacecraft.
5. Explain Thermal Subsystem of spacecraft
6. Discuss stabilization subsystem of spacecraft.
7. Explain transponder subsystem with neat sketch.
8. Explain a) Antenna subsystem of spacecraft b) propulsion subsystem of spacecraft.
9. Describe transmit-receive earth station with block diagram and cassegrain antenna.
10. Discuss space qualification and derive the expression for relativity.

UNIT-IV
PART-A
1. Define Bandwidth
2. Discuss: Satellite Bandwidth
3. Define FDM
4. Define TDM
5. What is Multiplexer
6. What is Demultiplexer
7. Define TDMA
8. Define FDMA
9. Define CDMA
10. Application of INSAT
11. Application of INMARSAT
12. Application of INTELSAT
13. Draw the structure of TDMA frame format
14. What is meant by channelized FDMA
15. Define Guard Time
16. What is meant by frequency hopping?
17. Define MCPC
18. Define SCPC
19. Define: Circuit Switching
20. Define : Packet Switching
21. Compare Circuit switching and Packet Switching
22. Compare FDM and TDM
23. List out the different kind of CDMA
24. List out the advantages of CDMA
25. Define fixed Assignment system
26. Define Demand Assignment System
27. Define DS-CDMA
28. Explain the operation of TDMA frame acquisition
29. Explain the operation of TDMA frame synchronization
30. What are the services offered by Geostationary and Non-Geostationary satellites.


PART-B
1. Briefly explain about INTELSAT.
2. Briefly explain about INSAT.
3. Briefly explain about INMARSAT.
4. Briefly explain about Mobile Satellite Services
5. Briefly explain about Weather Forecasting Services.
6. Briefly explain about Satellite Navigation.
7. Compare Multiple Access Techniques.
8. Explain different kinds of multiple access techniques.
9. Explain the operation of DS-CDMA
UNIT-V
PART-A
1. What are the various TV standards?
2. What is the line and field frequency of PAL and NTSC?
3. What are the number of frames and the scanning lines in PAL and NTSC?
4. What is the uplink frequency for satellite TV and why the uplink should be greater?
5. Differentiate MATV and CATV.
6. Define DBS and DAB.
7. What is video-on-demand?
8. Give a few examples of broadcasting satellite.
9. Give a few application of INSAT and ASIASTAR.
10. Define signal bandwidth, filter bandwidth, and Channel bandwidth.
11. Explain the principle behind interlaced scanning.
12. What is the Bandwidth requirement for satellite broadcast system?
PART-B
1. With neat block diagram discuss the principle and operation of PAL.
2. With neat block diagram discuss the principle and operation of NTSC.
3. Explain in detail about community antenna television.
4. Explain the operation of Direct to Home at the Transmitter and Receiver level.
5. With neat block diagram discuss the operation of Satellite Radio Receiver System.
6. Write Short notes on Digital Audio Broadcasting.
7. Write Short notes on CD audio system.
8. Write Short notes on INSAT.
9. Write Short notes on ASIASTAR.
10. Write Short notes on Direct Broadcast System.

Earning:   Approval pending.