GOCE long-wavelength gravity field recovery from 1s-sampled kinematic orbits using the acceleration approach
- authored by
- T. Reubelt, O. Baur, M. Weigelt, M. Roth, N. Sneeuw
- Abstract
The acceleration approach is an efficient and accurate tool for the estimation of the lowfrequency part of GOCE (Gravity field and steady-state Ocean Circulation Explorer) gravity fields from GPS-based satellite-to-satellite tracking (SST). This approach is characterized by second-order numerical differentiation of the kinematic orbit. However, the application to GOCE-SST data, given with a 1s-sampling, showed that serious problems arise due to strong amplification of high frequency noise. In order to mitigate this problem, we developed a tailored processing strategy in a recent paper which makes use of an extended differentiation scheme acting as low-pass filter, and empirical covariance functions to account for the different precision of the components and the inter-epoch correlations caused by orbit computation and numerical differentiation. However, also a more “bruteforce” strategy can be applied using the standard unextended differentiation scheme and data-weighting by error propagation of the provided orbit variance-covariance matrices (VCMs). It is shown that the direct differentiator shows a better approximation and the exploitedmethod benefits from the stochastic information contained in the VCMs compared to the former strategy. A strong dependence on the maximum resolution, the arc-length and the method for data-weighting is observed, which requires careful selection of these parameters. By comparison with alternative GOCE hl-SST solutions we conclude that the acceleration approach is a competitive method for gravity field recovery from kinematic orbit information.
- External Organisation(s)
-
University of Stuttgart
Austrian Academy of Sciences
University of Luxembourg
- Type
- Conference contribution
- Pages
- 21-26
- No. of pages
- 6
- Publication date
- 2014
- Publication status
- Published
- Peer reviewed
- Yes
- ASJC Scopus subject areas
- Computers in Earth Sciences, Geophysics
- Electronic version(s)
-
https://doi.org/10.1007/978-3-319-10837-7_3 (Access:
Unknown)
-
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