20-07-2013, 04:57 PM
Autonomous Routing Algorithm for LEO/GEO Satellite Networks
Autonomous Routing .pdf (Size: 1.14 MB / Downloads: 56)
Types of Satellites
1 Geostationary/Geosync
hronous Earth Orbit
Satellites (GSOs)
(Propagation Delay:
250-280 ms)
2 Medium Earth Orbit
Satellites (MEOs)
(Propagation Delay:
110-130 ms)
3 Highly Elliptical
Satellites (HEOs)
(Propagation Delay:
Variable)
4 Low Earth Orbit
Satellite (LEOs)
(Propagation Delay: 20-
25 ms)
Geosynchronous Orbit (GEO):
35,786 km above the earth
A geosynchronous
satellite is a satellite in
geosynchronous
orbit,
with an orbital period the
same as the Earth's
rotation period.
There are approximately
300
operational
geosynchronous
satellites.
These can remain at one
position for infinite time.
Architecture of LEO
Communications data passes through a
satellite using a signal path known as a
transponder.
Typically satellites have between 24 and
72 transponders. A single transponder is
capable of handling up to 155 million bits
of information per second.
With this immense capacity, today's
communication satellites are an ideal
medium for transmitting and receiving
almost any kind of content - from simple
voice or data to the most complex and
bandwidth-intensive video, audio and
Internet content.
Conclusions
GEO Satellite Networks have advantage of technological
maturity and good coverage.
GEO Satellite Networks are suffering form high delay and
attenuation limits transmitting real time information.
Today LEO satellite networks are most commonly used in
broadcasting Internet. Due to low cost and high data
transmission rate these LEO satellite networks are the
preferred choice of the vendors.