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The PRISMA project for autonomous formation flying and rendezvous has passed its critical design review in February–March 2007. The project comprises two satellites which are an in-orbit testbed for Guidance, Navigation and Control (GNC) algorithms and sensors for advanced formation flying and rendezvous. Several experiments involving GNC algorithms, sensors and thrusters will be performed during...
Atmosphere and climate explorer plus (ACE+) is an atmospheric sounding mission using radio occultation techniques and is a combination of the two Earth Explorer missions ACE and WATS earlier proposed to ESA.ACE+ is the response to ESAs second call for Earth Explorer Opportunity Missions in 2001 and was ranked no. 1 out of 25 candidate missions. ACE+ will considerably improve our knowledge about atmosphere...