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Time-variable gravity field determination from GRACE-FO data at AIUB
| Content Provider | Semantic Scholar |
|---|---|
| Author | Lasser, Martin Meyer, Uwe Arnold, Daniel Jäggi, Adrian |
| Copyright Year | 2019 |
| Abstract | Time-variable gravity field determination from GRACE-FO data at AIUB We study gravity field determination from GRACE-FO satellite-to-satellite tracking using the inter-satellite-link (KBR and LRI) and kinematic positions of the satellites as observations. The kinematic positions are obtained from a precise point positioning where the carrier phase ambiguities are fixed to integer values. We use a simplified stochastic model based on epoch-wise covariance information, which may be efficiently derived in the kinematic point positioning process, and extend this model by an empirical noise model derived from the residuals of a reduced-dynamic orbit fit of the kinematic positions to correctly characterise their stochastic behaviour. We also study empirical covariances of range-rate observations to characterise the inter-satellite-link noise. Furthermore, we investigate the interplay between the empirical noise model and the stochastic parameters of our celestial mechanics approach. We validate the performance of undifferenced ambiguity-fixed kinematic positions for GRACE-FO gravity field determination by analysing the residuals of combined orbits calculated using both kinematic positions and K-band data, and by analysing the quality of co-estimated gravity field solutions. We extend our validation to a first comparison of the K-band and laser-link range-rate observations. |
| File Format | PDF HTM / HTML |
| DOI | 10.7892/boris.138486 |
| Alternate Webpage(s) | https://boris.unibe.ch/138486/1/presentation-GSTM-Pasadena2019_final.pdf |
| Alternate Webpage(s) | https://doi.org/10.7892/boris.138486 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
