Summary: This document explains the theoretical basis for the OGA1 determination, i.e. the complete description of the EKF model implemented for the attitude improvement.

Bibtex entry for this abstract:

@UNPUBLISHED{LL:DMP-001,
   author = {D.~Padeletti and U.~Bastian},
   title={{O}{G}{A}1 {P}rocess {D}escription},
   institution={ZARM, Center of Applied Space Technology and Microgravity, Bremen},
   year={2009},
   month={October},
   url={http://www.rssd.esa.int/doc_fetch.php?id=2861528},
   note={GAIA-C3-TN-ZARM-DMP-001},
   type={Technical Note}
}