ELISA 1, ELISA 2, ELISA 3 and ELISA 4 are a suite of French military satellites launched on December 17 2011 from Arianespace's Kourou spaceport in French Guiana.
The ELISA suite are microsatellites and thus all four were launched on a single Soyuz ST-B rocket, along with Pleiades-1 and SSOT.
The ELISA (Electronic Intelligence by Satellite) programme is a demonstration system to pave the way for a planned radar monitoring system called ROEM (ELINT). The ELISA satellites will be placed in Low Earth orbit a few kilometers from each other to record radar or radio transmissions from Earth.
The satellites are built around the Myriade micro-satellite bus.
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