Exam Details
| Subject | satellite communication | |
| Paper | ||
| Exam / Course | pddc | |
| Department | ||
| Organization | Gujarat Technological University | |
| Position | ||
| Exam Date | November, 2018 | |
| City, State | gujarat, ahmedabad |
Question Paper
1
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER- VII• EXAMINATION Winter 2018
Subject Code:x71104 Date:26.10.2018
Subject Name: Satellite Communication
Time: 10.30 am to 01.00 pm Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1
Using a neat sketch, show and explain
Apogee
Argument of perigee
Inclination angle
Eccentricity
Line of nodes
Sub satellite point
Retrograde orbit
07
What kind of forces causes the state of "Free Fall" of a satellite body so that it can continue being in motion once it is placed in the orbit? Explain in details.
07
Q.2
Explain Earth Eclipse. What position of satellite is preferable to operate during eclipse?
07
A satellite is in a circular orbit around the earth. The altitude of the satellite's orbit above the surface of the earth is 1,400 km.
What are the centripetal and centrifugal accelerations acting on the satellite in its orbit?
What is the velocity of the satellite in this orbit?
What is the orbital period of the satellite in this orbit? min, sec) Assume the average radius of the earth is 6,378.137 km.
07
OR
Explain different types of orbits used for satellite communication
07
Q.3
Why stability of satellite is important in satellite communication? Explain three axis method of satellite stabilization.
07
Explain Equipment Reliability and Space Qualification.
07
OR
Q.3
Compare LEO, MEO and GEO satellite orbits.
07
Explain what is XPD? How XPD are predicted? Also Draw and Explain properly the Canting Angle and Tilt Angle with required equations.
07
Q.4
Briefly explain the procedure and derive the equation to design C/N uplink.
07
2
A satellite at a distance of 40000 km from a point on the earth's surface radiates a power of 2 W from an antenna with a gain of 17 dB in the direction of the observer. Find the flux density at the receiving point and the power received by an antenna with an effective area of 10 m2.
07
OR
Q.4
List all propagation effects which are not associated with hydrometer and explain them.
07
Briefly mention the operation of SPADE system of demand assignment.
07
Q.5
Compare FDMA, TDMA and CDMA in the context of satellite communications.
07
What is GPS? Explain principle of GPS position location.
07
OR
Q.5
What is VSAT? Draw and explain the block diagram of VSAT in detail.
07
Describe and compare MATV and CATV systems.
07
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER- VII• EXAMINATION Winter 2018
Subject Code:x71104 Date:26.10.2018
Subject Name: Satellite Communication
Time: 10.30 am to 01.00 pm Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1
Using a neat sketch, show and explain
Apogee
Argument of perigee
Inclination angle
Eccentricity
Line of nodes
Sub satellite point
Retrograde orbit
07
What kind of forces causes the state of "Free Fall" of a satellite body so that it can continue being in motion once it is placed in the orbit? Explain in details.
07
Q.2
Explain Earth Eclipse. What position of satellite is preferable to operate during eclipse?
07
A satellite is in a circular orbit around the earth. The altitude of the satellite's orbit above the surface of the earth is 1,400 km.
What are the centripetal and centrifugal accelerations acting on the satellite in its orbit?
What is the velocity of the satellite in this orbit?
What is the orbital period of the satellite in this orbit? min, sec) Assume the average radius of the earth is 6,378.137 km.
07
OR
Explain different types of orbits used for satellite communication
07
Q.3
Why stability of satellite is important in satellite communication? Explain three axis method of satellite stabilization.
07
Explain Equipment Reliability and Space Qualification.
07
OR
Q.3
Compare LEO, MEO and GEO satellite orbits.
07
Explain what is XPD? How XPD are predicted? Also Draw and Explain properly the Canting Angle and Tilt Angle with required equations.
07
Q.4
Briefly explain the procedure and derive the equation to design C/N uplink.
07
2
A satellite at a distance of 40000 km from a point on the earth's surface radiates a power of 2 W from an antenna with a gain of 17 dB in the direction of the observer. Find the flux density at the receiving point and the power received by an antenna with an effective area of 10 m2.
07
OR
Q.4
List all propagation effects which are not associated with hydrometer and explain them.
07
Briefly mention the operation of SPADE system of demand assignment.
07
Q.5
Compare FDMA, TDMA and CDMA in the context of satellite communications.
07
What is GPS? Explain principle of GPS position location.
07
OR
Q.5
What is VSAT? Draw and explain the block diagram of VSAT in detail.
07
Describe and compare MATV and CATV systems.
07
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