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GIOVE-A's Fregat Disposal Assessment

Navarro Reyes, D. 1, Zandbergen, R. 1, Escobar, D.1
Affiliation data not available1

Document details

Publishing year2009 PublisherESA Publishing typeConference Name of conference5th European Conference on Space Debris
Pagesn/a Volume
H. Lacoste


Galileo will be Europe's own global navigation satellite system, providing a highly accurate, guaranteed global positioning service under civilian control. Following the approval of Galileo in 1999, a demonstration element was added - the Galileo System Test Bed (GSTB) with the GIOVE-A and GIOVE-B satellites - to allow early experimentation with the navigation signals and services before committing to the final constellation design. GIOVE-A (launched on 28 Dec 2005) and GIOVE-B (launched on 26 April 2008) were injected in the Galileo operational orbit (semi-major axis 29600 km, circular orbit, inclination 56 degrees) by direct injection with Soyuz/FREGAT launch vehicle.In order to mitigate future collision risks at Galileo altitudes, it was decided that all injected objects (FREGAT, and GIOVE/Galileo satellites at end-of-life) would be placed in higher-altitude disposal orbits. After separation from the GIOVE satellites, in both cases, FREGAT performed manoeuvres to move to a disposal orbit with a higher altitude. The disposal orbit was targeted as to minimize eccentricity growth and therefore maximize time for FREGAT to cross the operational orbit altitude. The objectives of this paper are: • To present an assessment of the FREGAT graveyarding actual manoeuvres with respect the target disposal orbit.• To present an assessment of the FREGAT actual disposal orbit evolution based on long-arc TLE fitting, taking into account accuracy of the fitting and of very long-term predictions.