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18-03-2012, 03:47 PM
Post: #1
ppt on satellite communication free download
I need ppt for Basic fundamentals about satellite communication there types,about different types of attenas ,there uses etc.
19-03-2012, 11:37 AM
Post: #2
RE: ppt on satellite communication free download
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20-09-2012, 03:34 PM
Post: #3
RE: ppt on satellite communication free download
Satellite Communication


.ppt  satellite1.ppt (Size: 947 KB / Downloads: 77)

Communication is the transfer of message or signals from transmitter at one point to another point i.e. receiver.
If the above comm. is done with the help of satellite, it is said to be satellite comm.
From the transmitter the signal which is basically a modulated microwaves is sent to the satellite.
Then the satellite amplifies the signals and sent it back to the receiver’s antenna on the earth.

Types of Satellite Comm.

Satellite Orbits
GEO
LEO
MEO
Molniya Orbit

Geostationary Earth Orbit(GEO)

These satellites are in orbit 35,863 km above the earth’s surface along the equator.
Objects in Geostationary orbit revolve around the earth at the same speed as the earth rotates.

Low Earth Orbit (LEO)

LEO satellites are much closer to the earth than GEO satellites, ranging from 500 to 1,500 km above the surface.
LEO satellites don’t stay in fixed position relative to the surface, and are only visible for 15 to 20 minutes each pass.
A network of LEO satellites is necessary for LEO satellites to be useful

Advantages of Satellite Communication

The advantages of satellite communication over terrestrial communication are:
The coverage area of a satellite greatly exceeds that of a terrestrial system.
Transmission cost of a satellite is independent of the distance from the center of the coverage area.
Satellite to Satellite communication is very precise.
Higher Bandwidths are available for use.

Disadvantages of Satellite Communication

The disadvantages of satellite communication:
Launching satellites into orbit is costly.
Satellite bandwidth is gradually becoming used up.
There is a larger propagation delay in satellite communication than in terrestrial communication.
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