Details
| Original language | English |
|---|---|
| Title of host publication | Gravity, Geoid and Height Systems - IAG Symposium GGHS2012, Proceedings |
| Editors | Urs Marti, Pascal Willis, Chris Rizos |
| Publisher | Springer Verlag |
| Pages | 21-26 |
| Number of pages | 6 |
| ISBN (electronic) | 9783319108360 |
| Publication status | Published - 2014 |
| Externally published | Yes |
| Event | International Association of Geodesy Symposium on Gravity, Geoid and Height Systems, GGHS 2012 - Venice, Italy Duration: 9 Oct 2012 → 12 Oct 2012 |
Publication series
| Name | International Association of Geodesy Symposia |
|---|---|
| Volume | 141 |
| ISSN (Print) | 0939-9585 |
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.
Keywords
- Data weighting, GOCE, Gravity field, Kinematic orbits, Orbit variances, Satellite-to-satellite tracking
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Computers in Earth Sciences
- Earth and Planetary Sciences(all)
- Geophysics
Cite this
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Gravity, Geoid and Height Systems - IAG Symposium GGHS2012, Proceedings. ed. / Urs Marti; Pascal Willis; Chris Rizos. Springer Verlag, 2014. p. 21-26 (International Association of Geodesy Symposia; Vol. 141).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - GOCE long-wavelength gravity field recovery from 1s-sampled kinematic orbits using the acceleration approach
AU - Reubelt, T.
AU - Baur, O.
AU - Weigelt, M.
AU - Roth, M.
AU - Sneeuw, N.
N1 - Publisher Copyright: © Springer International Publishing Switzerland 2014.
PY - 2014
Y1 - 2014
N2 - 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.
AB - 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.
KW - Data weighting
KW - GOCE
KW - Gravity field
KW - Kinematic orbits
KW - Orbit variances
KW - Satellite-to-satellite tracking
UR - http://www.scopus.com/inward/record.url?scp=84927648543&partnerID=8YFLogxK
U2 - 10.1007/978-3-319-10837-7_3
DO - 10.1007/978-3-319-10837-7_3
M3 - Conference contribution
AN - SCOPUS:84927648543
T3 - International Association of Geodesy Symposia
SP - 21
EP - 26
BT - Gravity, Geoid and Height Systems - IAG Symposium GGHS2012, Proceedings
A2 - Marti, Urs
A2 - Willis, Pascal
A2 - Rizos, Chris
PB - Springer Verlag
T2 - International Association of Geodesy Symposium on Gravity, Geoid and Height Systems, GGHS 2012
Y2 - 9 October 2012 through 12 October 2012
ER -