Spirale
France
Original archive entry. The text, images and links below are kept as they were written.
Système Préparatoire Infra-Rouge pour l'ALErte - preparatory infrared warning system. French government program to develop a missile early warning system, using infrared satellite imagery to detect ballistic missile launch and trajectory during boost phase. The demonstrator system included two 120 kilogram (260 lb) microsatellites and an alert and monitoring ground segment.
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