1. Discuss in detail the Design Consideration of a Satellite Communication Systems. [16]
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1 Code No: R Set No Discuss in detail the Design Consideration of a Satellite Communication Systems. 2. (a) What is a Geosynchronous Orbit? Discuss the advantages and disadvantages of these orbits. (b) What are Orbital Perturbations? Explain the effects of earth s oblateness on orbital inclination of Geosynchronous Satellite. [8+8] 3. (a) Write short notes on Telemetry Tracking and Command System. (b) Explain the importance of reliability in the design and construction of Satellites. [8+8] 4. (a) What are the factors that effect the uplink and down link design in geo stationary satellite system. Discuss in detail. (b) For an EIRP of 100 dbw, a carrier frequency of 10 GHz and the distance between earth station and satellite of 36000Km. Calculate the CNR in 10MHz bandwidth if the ground station G/T is 20 db/k. [8+8] 5. A BPSK TDMA system is to transmit 1000 digital voice channels, each with 4 bits per sample at a 64kbps rate. The system must accommodate 1000 data bits/slot at a frame efficiency of 90%. (a) What is the number of slots in a frame? (b) What is the length of TDMA frame? (c) How many preamble bits can be used? (d) What is the required satellite bandwidth? 6. (a) What are the functions of Earth station Tracking system to be performed? (b) Explain the functional elements of a satellite tracking system? [6+10] 7. (a) Explain the general aspects of coverage and frequency considerations of low earth orbit. (b) Why L-band is allocated for mobile satellite service? [8+8] 8. Explain about: (a) GPS receiver 1 of 2
2 Code No: R Set No. 1 (b) GPS codes. [8+8] 2 of 2
3 Code No: R Set No Write a brief history of Indian Satellite Communication. 2. (a) Draw the geometry of a geostationary link showing elevation, azimuth and range. (b) A geostationary satellite moving in an equatorial orbit is at a height of 35786Km from the earth s surface. If the earth radius is taken as 6378 Km, determine the theoretical maximum coverage angle and maximum slant range. [8+8] 3. (a) Describe the three types of antennas used in Satellites. (b) Write short notes on Transponders. [8+8] 4. (a) Explain the design procedure of Satellite Communication Link. (b) Thermal Noise in an earth station receives results in a (C/N)d N ratio of 20.0 db. A signal is received from a bent pipe transponder with a carrier to noise ratio (C/N) Up = 20.0dB. What is the value of overall (C/N) 0 ratio at the earth station the earth station. If the transponder introduces intermodulation products with (C/I) ratio =24dB. What is the overall (C/N) 0 ratio at the receiving earth station. [8+8] 5. What is a burst? Explain the difference between the reference burst and traffic burst. Explain their positions in a TDMA frame. Explain their structures too. 6. (a) What are the different types of antenna mounts? (b) Suppose the receiver antenna is a parabolic dish antenna with diameter of 1.75m and is operation with a horn at 5.956GHz. Calculate the antenna operation and the gain in db. The efficiency of receiving antenna is 80%? [6+10] 7. Explain the set of specifications to illustrate non-geostationary satellite systems. 8. (a) Explain the C\A code generator of GPS. (b) Explain the simplified block diagram of a C\A code GPS receiver. [8+8]
4 Code No: R Set No (a) List the various Benefits and Drawbacks of Satellite Communications. (b) Explain the various reasons for preferring Satellites than Optical Fibers which are providing very high bandwidth. [8+8] 2. (a) Explain orbital effects in Communication System Performance. (b) Describe the orbit and explain how the satellite is located with respect to earth. [8+8] 3. (a) Why blue light sensitive solar cell are preferred for power generation at satellite. (b) Discuss the Satellite Antennas in Practice. [8+8] 4. (a) Why uplink frequency is different from down link frequency in a satellite communication system? Discuss. (b) Derive the general link design equation. Find out the expression for (C/N) and (G/T) ratios. Explain the importance of these ratios in satellite link design. [8+8] 5. (a) Illustrate the DS-SSCDMA with seven chip spread code sequence (b) Show a base band correlator for discrete spread CDMA system? [12+4] 6. In Earth station explain: (a) Low-noise amplifier (b) High power amplifier and mention advantages and disadvantages and applications. 7. Explain the following in LEO: (a) Internal growth (b) Interim operations (c) Replenishment options (d) End-to-End system implementations. 8. (a) What is meant by differential phase GPS? (b) What are uses of kinematics DGPS? [12+4]
5 Code No: R Set No Discuss the applications of Satellite Communication. 2. Discuss in detail the effects of Earth Gravitational Force on Satellite. 3. (a) Draw a neat diagram of Telemetry, Tracking and command and explain the operation. (b) What is Transponder? How many transponders are provided in a satellite link and discuss about the frequencies used in these transponders. [8+8] 4. (a) What is System Noise Temperature? Derive an expression for system noise temperature of the receiver. (b) For a satellite earth station receiver, working on 4GHz, the various gain and equivalent noise temperatures are T in = 50 0 K,T RF = 50 0 K,T m = K and T IF = k, G RF = 23 db G m = 0 db and G IF = 30 db. Calculate the system noise temperature. [8+8] 5. (a) Define CDMA? What are its advantages? (b) Explain the basic principle of a direct sequence spread spectrum [CDMA] system? [6+10] 6. Explain the structure of cassegrain Antenna used for large Earth stations with neat diagram. What are the methods adopted to obtain optimum gain with cassegrain Antennas. 7. (a) Write the advantages and disadvantages of low and medium earth station? (b) Explain the general aspects of coverage and frequency considerations of low earth orbit. [8+8] 8. (a) Explain the position location in GPS. (b) How clock error is avoided in GPS? [12+4]
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