Improvement of the Complete TOPEX and Jason Orbit Time Series (1992-2017): GSFC Status
Event: 2017 Ocean Surface Topography Science Team Meeting
Session: Precision Orbit Determination
Presentation type: Type Oral
Contribution: PDF file
Orbit error remains a major component in the overall error budget of all altimeter satellite missions. Error sources include terrestrial reference frame and station positions, systematic and unaccounted-for errors in the satellite tracking measurements, mismodeling of nonconservative forces, and incomplete modeling of time-variable gravity. This paper presents our choice of ITRF2014-based complements from among the other 2014 ITRS realizations, resulting in a complete and consistent time series of improved orbits from TOPEX/Poseidon to Jason-3. The altimeter measurement calibration with tide gauges is shown, and the GSFC orbits are compared with orbits from other analysis centers, including the CNES, JPL, ESA and the GFZ. We also characterize the errors due to epoch time corrections in SLR data derived from Jason-2/T2L2, orbit mis-centering and atmospheric pressure loading, the current IERS pole tide model, and incomplete application of time-varying gravity. Plans for updating our POD standards are discussed.