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| Titel |
Meteorological information in GPS-RO reflected signals |
| VerfasserIn |
K. Boniface, J. M. Aparicio, E. Cardellach |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 4, no. 7 ; Nr. 4, no. 7 (2011-07-18), S.1397-1407 |
| Datensatznummer |
250002052
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| Publikation (Nr.) |
 copernicus.org/amt-4-1397-2011.pdf |
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| Zusammenfassung |
| Vertical profiles of the atmosphere can be obtained globally with the
radio-occultation technique.
However, the lowest layers of the atmosphere are less accurately extracted.
A good description of these layers is important for the good performance
of Numerical Weather Prediction (NWP) systems, and an improvement of the
observational data available for the low troposphere would thus be of
great interest for data assimilation.
We outline here how supplemental meteorological information close to the
surface can be extracted whenever reflected signals are available.
We separate the reflected signal through a radioholographic filter, and we
interpret it with a ray tracing procedure, analyzing the trajectories of
the electromagnetic waves over a 3-D field of refractive index.
A perturbation approach is then used to perform an inversion, identifying
the relevant contribution of the lowest layers of the atmosphere to the
properties of the reflected signal, and extracting some supplemental
information to the solution of the inversion of the direct propagation signals.
It is found that there is a significant amount of useful information in
the reflected signal, which is sufficient to extract a stand-alone profile
of the low atmosphere, with a precision of approximately 0.1 %.
The methodology is applied to one reflection case. |
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