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| Le Traon, Pierre-yves; Ogor, Florian. |
| The ERS orbit error reduction method using TOPEX/POSEIDON (TIP) data as a reference [Le Traon et al., 1995a] was applied to ERS-1 cycles from phases C, E, F, and G and to the first 16 cycles of the ERS-2 mission (phase A). T/P M-GDR (geophysical data record) (version C) and ERS-1/2 ocean product (OPR) data were used. ERS-1/2 orbits are the D-PAF (processing and archiving facility) orbits and, when necessary, ERS-1/2 altimetric corrections were updated to make the T/P and ERS-1/2. corrections homogeneous. The adjustment method has been refined, and formal error on the estimation is now calculated. The ERS-1/2 orbit error estimation is thus estimated to be precise to within about 2 cm root-mean-square (rms). E-E crossover differences are reduced from 12 to... |
| Tipo: Text |
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| Ano: 1998 |
URL: http://archimer.ifremer.fr/doc/00079/19022/16609.pdf |
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| Gaspar, P; Ogor, Florian; Le Traon, Pierre-yves; Zanife, Oz. |
| TOPEX (Ku band) and POSEIDON altimeter measurements at crossover points are used to estimate the sea state bias (SSB) of these two instruments. Different SSB models are tested, ranging from a constant fraction of the significant wave height (SWH) to more elaborate models involving up to four adjustable parameters. For TOPEX, the data show a decrease in the magnitude of the relative bias (SSB/SWH) with SWH. This behavior is well reproduced using a simple empirical model with two adjustable parameters. The three-parameter SSB model used in the NASA geophysical data records does well in explaining the wind-induced variations of the bias. A model including four adjustable parameters is needed to account for both the wind- and SWH-related variability of the... |
| Tipo: Text |
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| Ano: 1994 |
URL: http://archimer.ifremer.fr/doc/00079/18984/16628.pdf |
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