Page 211 - DCAP311_DCAP607_WIRELESS_NETWORKS

Unit 12: Space-based Wireless WANs

Low Earth Orbit: These satellites are placed 500-1500 kms above the surface of the earth as LEOs Notes
circulate on a lower orbit, hence they exhibit a much shorter period that is 95 to 120 minutes.
Medium Earth Orbit: Medium Earth orbit (MEO), sometimes called intermediate circular
orbit (ICO), is the region of space around the Earth above low Earth orbit (altitude of 2,000
kilometres (1,243 mi)) and below geostationary orbit (altitude of 35,786 kilometres (22,236 mi)).
Elliptical Orbits: An elliptic orbit is a Kepler orbit with theeccentricity less than 1; this includes
the special case of a circular orbit, with eccentricity equal to zero.

ProTrak Service: ProTrak is a service for the localization and tracking of stolen vehicles.
Over dense Trials: Over dense trials produce relatively strong signal reflections.
Under dense trails: Under dense trails are formed by very small meteors, typically the size of a
grain of sand.
12.5 Review Questions

1. Define Satellite.
2. Discuss the evolution of communication satellites.
3. How satellites work?
4. Explain the future of satellite communication.

5. Distinguish between geostationary orbit and Elliptical Orbits.
6. What do you understand by Meteor Burst Communications?
7. Highlight the basic characteristics of Meteor Burst Communications.
8. Describe MBC Network Applications.

9. What are the principles of Meteor Burst Communication?
10. Write brief note on the network of Meteor Burst Communication (MBC).
11. Discuss Meteor Trails.
12. Highlight the future developments of MBC.

Answers: Self-Assessment

1. False 2. True
3. False 4. False

5. True 6. False
7. True 8. True
9. Radio Communications 10. Meteor Trails
11. 1950s 12. FleetTrak

13. ProTrak 14. MBC
15. Line-of-Sight (LOS) 16. Under dense

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