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An earth station antenna has a diameter or 30 m, has an overall efficiency of 68% and is used to receive a signal at 4150 MHz. A this frequency, the system noise temperature is 79 K when the antenna points at the satellite at an elevation angle of 28°. What is the earth station G/T ratio under these conditions? If heavy rain causes the sky temperature to increase so that the system noise temperature rises to 88K, what is the new G/T value?
A C-band earth station has an antenna with a transmit gain of 54 dB. The transmitter output power is set to 100 W at a frequency of 6.100 GHz. The signal is received by a satellite at a distance of 37,500 km by an antenna with a gain of 26 dB. The signal is then routed to a transponder with a noise temperature of 500 K, a bandwidth of 36 MHz, and a gain of 110 dB. Calculate (i) path loss at 6.1 GHz. (ii) power at the output port of the satellite antenna, in dBW. (iii) noise power at the transponder input (iv) C/N ratio, in dB, in the transponder (v) carrier power, in dBW and in watts, at the transponder output.
Explain Kepler's three law of planetary motion with required expression.
Compare Pre-assigned FDMA and Demand assigned FDMA.
Write a note on GPS
Elucidate the attitude and orbit control system of a satellite.
What are overheads in TDMA frame? Explain their structure
Elucidate the VSAT earth station engineering with a typical hub master control.
Explain the satellite mobile system with necessary diagram.
Explain DTH and BTV.
A satellite is in an elliptical orbit with a perigee of 1000 km and an apogee of 4000 km. Using a mean earth radius of 6378.14km. Find the period of the orbit in hours, minutes, and seconds, and the eccentricity of the orbit.
Design the satellite uplink and downlink with their link budgets.
Explain the operation of 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.
Discuss the various design issues related with uplink design and give the expression C/N ratio for the same.
Describe the orbital perturbations with respect to longitudinal and inclination changes.
A satellite in orbit has got an orbital period of a solar day.Calculate the radius of the orbit. An observer on earth sees that the satellite is drifting. Find the rate of drift of the sub satellite point around the equator in degrees per solar day. Conclude whether the satellite is moving eastwards or westwards.
(a) Explain the basic differences between active and passive satellite systems. Discuss merits and demerits.
(b) List the basic factors affecting satellite position.
(c) What is the principle of GPS?
(d) Discus how the altitude and orbit control is achieved from an earth station.
(e) Discuss the different applications and services provided by the satellite
(a)Describe the following terms of Earth orbiting satellites:
(i) Ascending node (ii) Line of apsides (iii) Inclination (iv) Apogee (v) True anomaly (vi) Mean anomaly (vii) Retrograde orbit .
(b) Explain Atmospheric Losses and lonosphere Effects for radio wave propagation
(c) Compare FDMA, TDMA and CDMA techniques.
(d) Explain DBS satellite system.
(e) What is the purpose of Telemetry, Tracking, Command, and Monitoring in Satellite communication? Explain-in detail.
Explain the following :-
(a) ISDN services
(b) Direct broad cast satellite
Write short note on RADARSAT.
(a) Automatic Repeat request (ARQ)
(b) Limitations of CDMA
Describe the significance and importance of kepler laws.
What is satellite switching? Explain the difference between static and dynamic switching. Discuss the operation of a typical SS-TDMA system. How is SS-TDMA different from beam hopping TDMA?
Discuss about the communication payload and supporting subsystems.
A geostationary satellite is located at a distance of 3000 Km with an operating frequency 14.25 GHz. The gain of transmitting and receiving antennary are 15 and 20 simultaneously. If the transmitter power is 200 kW. Calculate the power received by the receiving antenna.
Discuss the concept of VSAT system in detail with diagram.
Discuss the importance of station keeping
What are the factors that affect the uplink design and the downlink design in geostationary satellite communication? Discuss in detail.
Show the different types of satellite orbits and discuss their merits and demerits.
List and explain any one type of Launching procedure of satellite.
What are the elements of satellite communication system? Explain each with a suitable black diagram.
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