Satellite Communication

Q.1. Assume a circular orbit: Using Newton's law of gravitation and Newton's second law, determine the acceleration of a satellite.

Q.2. Define payload and transponder.

Q.3. Explain the use of control bits in the data frame.

Q.4. What is the difference between active and passive satellites?

Q.5. What does the acronym VSAT stand for? Also define the term Figure of Merit.

Q.6. State Kepler's third law.

Q.7. Define encryption.

Q.8. What is meant by perigee and apogee?

Q.9. List out the types of modulation scheme employed in satellite communication.

Q.10. Define the term "antenna gain".

Q.1. Discuss about frequency allocations for satellite communication.

Q.2. What is thermal control? Why is it required?

Q.3. Define and explain the terms roll, pitch and yaw.

Q.4. Explain the working of global positioning system in detail.

Q.5. An antenna has a noise temperature of 35 K and is matched into a receiver which has a noise temperature of 100 K. Calculate the noise power density and the noise power for a bandwidth of 36 MHz.

Q.6. Define Universal time and sidereal time.

Q.7. A satellite is orbiting in a geosynchronous orbit of radius 42500 km. Find the velocity and time of orbit. What will be the change in velocity if the radius reduces to 36000 km? If G0=398600.5 Km³s².(Assume standard gravitational parameter units.)

Q.1. Illustrate what is meant by FDMA, and show how this differs from FDM.

Q.2. Explain the effect of rain and intermodulation noise in the satellite communication system, and describe how it is reduced.

Q.3. Explain the different types of transmission losses in satellite communication with necessary expression.

Q.4. From the calculation of system noise temperature prove that C/N ratio is directly proportional to G/T ratio.

Q.5. With suitable and neat and clean diagram, illustrate the various modules of Attitude and Orbit Control (AOCS) sub-system.