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[[File:SPOT_4.jpg|frame|left|SPOT-4 satellite produced by CNES]]
[[File:SPOT_4.jpg|frame|right|SPOT-4 satellite produced by CNES]]
[[File:ARTEMIS.jpg|frame|right|An artist's rendition of ARTEMIS]]
[[File:ARTEMIS.jpg|frame|right|An artist's rendition of ARTEMIS]]
ARTEMIS and SPOT-4 were two European satellites that established an 830 nm intersatellite link as part of an ESA/CNES mission. Unlike many technical demonstrations, the optical link was used throughout the lifetime of the two satellites and was operated for a total of 230 hours to exchange telemetry and sensor data. This was the first demonstration of imagery transmission between two satellites over an optical communications link.
ARTEMIS and SPOT-4 were two European satellites that established an 830 nm intersatellite link as part of an ESA/CNES mission. Unlike many technical demonstrations, the optical link was used throughout the lifetime of the two satellites and was operated for a total of 230 hours to exchange telemetry and sensor data. This was the first demonstration of imagery transmission between two satellites over an optical communications link.