Page - 155 - in Contributions to GRACE Gravity Field Recovery - Improvements in Dynamic Orbit Integration, Stochastic Modelling of the Antenna Offset Correction, and Co-Estimation of Satellite Orientations

reasons mentioned above. Further, the release 3.0 SCA1B data product will include im- provements in the provided satellite orientations. Particularly, several errors previously present in the orientation determination chain were found and fixed in this release (GRACE, 2018). It remains to be investigated whether these large improvements to the SCA1B data can make a co-estimation of the satellite orientation unnecessary. As the fundamental data needed to form the orientation covariance matrices will again be available for GRACE-FO, the orientation co-estimation could be applied for this mission. 155