Seite - 144 - 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

60°S 30°S 0° 30°N 60°N 180°W 90°W 0° 90°E 180°E (a) Old stochastic model. 1 (b) Using AOC covariance. (c) Difference AOC covariance - old model. 1 (d) TLS solution. (e) Difference TLS solution - old model. −20−15−10 −5 0 5 10 15 20 Equivalentwater height [cm] (a,b,d) −4 −2 0 2 4 Equivalentwater height [cm] (c,e) Figure 9.10: Equivalent water height maps for June 2010, a month of deteriorated data. The top and left column shows the monthly gravity field variations for the three computed solutions. The right column shows the difference of the improved solutions w.r.t. the reference solution. A 300km Gaussian filter was applied to the solutions. Note the different scale for (c), (e). Chapter9 Co-Estimation of Orientation Parameters144