ESA GNC Conference Papers Repository
Comprehensive Investigation of Micro-Vibrations Impact due to Different Disturbance Sources on Spacecraft Pointing Stability and Instrument Performances for the BepiColombo Mission
During the scientific observations of the BepiColombo mission around Mercury, the performance of the onboard instruments may be affected by the micro-vibrations caused by the reaction wheels and the driving mechanisms of the Solar Array (SA) and the High Gain Antenna (HGA). Most of the instruments require continuous and highly-accurate nadir-pointing. In particular, the line-of-sight stability must be better than 1 arcsec over 1 sec and better than 0.1 arcsec over 1 msec. These requirements are to be met 95% of the time over the 2 years of science operation. The purpose of this study was the definition of a methodology to assess the pointing stability contributions due to the micro-vibrations originating from the different disturbance sources on-board, in order to verify the requirements.