3 Geostationary orbit laser supply network with relay mirrors The third system shown in Figure 3 is a geostationary orbit laser supply network with relay mirrors mainly supplying GEO satellites. Direct GEO-Earth transmission can also be considered in this case. This network can be coupled to an LEO network. 4 Geostationary supply network with ground-based laser The fourth system is a geostationary supply network using ground-based lasers. To cope with local weather conditions which interfere with ground to space transmissions, several lasers must be used, each at a different location and with unrelated weather (for example, on different continents).
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