GOCE was launched in 2009 at 250 km altitude to recover Earth's static gravity field. As part of the GOCE-Italy project, we carried out GPS-based, fully-dynamic POD of GOCE for daily arcs covering about 500 days (November 1, 2009 - May 31, 2011). Two sequences were defined and implemented with the software NAPEOS (ESA/ESOC). The first sequence performs the POD task for 30-hours daily arcs, leading to 6 hours overlap between subsequent days, while the second sequence performs the same task for 24-hours daily arcs. Both the sequences were built using the official kinematic Precise Scientific Orbits (PSO) as a-priori orbits. The sequence with overlaps was used to process all the available data, while the second one was run only for those days where the overlaps were not possible or when the first sequence failed. The POD task was successfully performed for 99.4% of the total available days of data, and results show an average post-fit RMS of zero difference phase measurements below 10 mm for 91.5% of the daily arcs. Most orbits compare to less than 6 cm 3D RMS with respect to the official kinematic PSO orbits and the overlapping arcs show an RMS of the distance of about 13 mm.
GOCE Fully-Dynamic Precise Orbit Recovery
GINI, FRANCESCO;PANZETTA, FRANCESCA;BARDELLA, MASSIMO;CASOTTO, STEFANO
2013
Abstract
GOCE was launched in 2009 at 250 km altitude to recover Earth's static gravity field. As part of the GOCE-Italy project, we carried out GPS-based, fully-dynamic POD of GOCE for daily arcs covering about 500 days (November 1, 2009 - May 31, 2011). Two sequences were defined and implemented with the software NAPEOS (ESA/ESOC). The first sequence performs the POD task for 30-hours daily arcs, leading to 6 hours overlap between subsequent days, while the second sequence performs the same task for 24-hours daily arcs. Both the sequences were built using the official kinematic Precise Scientific Orbits (PSO) as a-priori orbits. The sequence with overlaps was used to process all the available data, while the second one was run only for those days where the overlaps were not possible or when the first sequence failed. The POD task was successfully performed for 99.4% of the total available days of data, and results show an average post-fit RMS of zero difference phase measurements below 10 mm for 91.5% of the daily arcs. Most orbits compare to less than 6 cm 3D RMS with respect to the official kinematic PSO orbits and the overlapping arcs show an RMS of the distance of about 13 mm.
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