ELISA (satellite)

ELISA is a suite of four French military satellites launched on 17 December 2011 from Arianespace's Kourou spaceport in French Guiana.
It consists of microsatellites ELISA 1, ELISA 2, ELISA 3, and ELISA 4
The entire ELISA suite was launched on a single Soyuz ST-A launch vehicle, along with Pléiades-1 and SSOT.
The ELISA program is a demonstrator meant to pave the way for a planned Signals intelligence constellation called CERES. The ELISA satellites are in a Low Earth orbit a few kilometers from each other to record radar and radio transmissions. Since 2014, they have been used as a pre-operational system.
The satellites are built around the Myriade microsatellite bus.