MU Electronics and Telecom Engineering (Semester 8)
Total marks: --
Total time: --
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary
Solve any five question from Q.1(a,b,c,d,e,f,g)
1(a) Why the 'Earth sensors' are not used for sensing the 'Yaw' axis in GEO satellites?
1(b) Why a multi-beam antenna is used in satellite communication?
1(c) For the same area of solar array which configuration spin stabilization or body stabilization, generate more power. Justify.
1(d) Differentiate between window & frame organization.
1(e) Why LNA in a satellite receiving system is placed at the antenna end of the feeder cable?
1(f) Explain with diagram what is "Umbra" and "penumbra"? How it is affecting satellite operation?
2(a) What are the different antenna tracking techniques of geostationary satellite?
2(b) Discuss in detail Telemetry, tracking and command with necessary block diagram.
3(a) What are the main consideration in the design of an earth station? And how the earth stations are classified ?
3(b) Explain the need of placing LNA next to Antenna, Calculate over all C/N Ratio for satellite if [C/N], uplink = 25db & [C/N], downlink = 20 db Intermodulation Noise =12db
4(a) Discuss Design Consideration of Earth station, Draw the block diagram for Transmit and receive earth station and explain.
4(b) Compare Pre assigned FDMA and Demand assigned FDMA.
4(c) Explain TDMA frame structure.
5(a) Explain on board connectivity with Transparent processing.
5(b) Discuss OSI Model for satellites Network also discuss layering principle.
5(c) Why TWT amplifier is Preferred for satellite communication?
6(a) Write Short Note On : Optical satellite Transmitter and receiver
6(b) Write Short Note On : Comparison of DS-CDMA, FH-CDMA and TH-CDMA.
6(c) Write Short Note On : Launching Mechanism
6(d) Write Short Note On : Reliablity and space qualification test
6(e) Write Short Note On : VSAT