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LEO os called Low earth orbit, MEO is called Medium Earth Orbit and GEO is called Geostationary orbit. LEO are about 500 Km to 1500 Km above the earth, so the delay is very small and the losses is small too. MEO are installed at 5000 to 12000 km above the earth and generally used for navigation communications like GPS. GEO is about 35800 Km above the equator, the delay and losses are greater, but the advantages is more coverage (it covers 40% of the earth) and there no need to track the satellite, so the earth terminal is cheaper.

See the following figure which describes them nicely

I would like to add few additional information as follows:
1. Since LEO satellite is nearer to planet compare to MEO and GEO, it has small cell (or foot print).
2. Due to small cell coverage, more number of LEO satellite need to install to cover the planet(for instance earth).
3. LEO moves very fast compare to MEO, so very frequent hand-off is required between two LEO satellites to avoid interrupt for ongoing calls between two users.
4. GPS satellite uses medium earth orbit.
5. Satellites which use geostationary orbit known as GEO

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