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Communications Satellites (GEO (problems (no signal at long distance,…
Communications Satellites
specialized wireless receiver/trasmitter
uplink signal from the Earth
downlink signal to the Earth
three areas
GEO
MEO
LEO
GEO
the most popular
The Equator: 35400 Km
trip around: 24 hours
problems
no signal at long distance
delay
one third of the Earth
circular orbit
Geostationary Earth Orbit
lifespan of 10-15 years
MEO
altitude: 5000 to 12000 Km
GPS (Global Position System)
elliptical orbit
Medium Earth Orbit
LEO
altitude: 200 to 1400 Km
rapid circle
one location for 90 minutes
advantages
faster communications
high speed
shorter delays
less expensive
disadvantages
less powerful
shorter lifespan
Low Earth Orbit
satellites
wide-area communications
weather forecasting
TV broadcasting
radio communications
C
first band
larger antenna
Ku
band for VSAT system
Ka
new band