Improvement of the Complete TOPEX and Jason Orbit Time Series (1992-2017): GSFC Status

Frank Lemoine (NASA GSFC, United States)

CoAuthors

Nikita Zelensky (SGT Inc., U.S.A.); Brian Beckley (SGT Inc., USA); Pierre Exertier (Observatoire de la Côte d’Azur, FRANCE); Douglas Chinn (SGT Inc., U.S.A.); Despina Pavlis (SGT Inc., U.S.A.); Jean-Paul Boy (EOST/IPGS, Université de Strasbourg, FRANCE)

Event: 2017 Ocean Surface Topography Science Team Meeting

Session: Precision Orbit Determination

Presentation type: Type Oral

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.
 

Oral presentation show times:

RoomStart DateEnd Date
Symphony II Tue, Oct 24 2017,09:15 Tue, Oct 24 2017,09:30
Frank Lemoine
NASA GSFC
United States
Frank.G.Lemoine@nasa.gov