Page - 42 - 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

GNSS Processing KBR Input Data Intermediate Results Final Results For both GRACE-A and GRACE-B Level 1B Data Download SCA/ANG Sensor Fusion ACC Calibration, Data Screening, AOC Computation GPS ANGSCA FUS re, r˙e ACC ACC FUS re, r˙e KBR Variational Equation and Dynamic Orbit Integration / Fit r, r˙ Φ POD Estimation of Stochastic Model KBR Cˆxx σˆ2Cˆxx σˆ2 POD A/B Compute Gravity Field ∆sˆnm∆cˆnm sˆnmcˆnm Restore Background Models Figure 6.1: Schematic for ITSG-Grace2016 level 1B to level 2 data processing.Φ is the state transition matrix of the variational equations.xcal are the co-estimated calibration parameters for the accelerometer. Chapter6 ITSG-Grace201642