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Título

Is Accurate Synoptic Altimetry Achievable by Means of Interferometric GNSS-R?

AutorFabra Cervellera, Fran CSIC ORCID; Cardellach, Estel CSIC ORCID; Ribó, Serni CSIC ORCID ; Li, Weiqiang CSIC ORCID; Rius, Antonio CSIC ORCID; Arcos Jiménez, José Antonio; Nogues-Correig, Oleguer CSIC; Praks, Jaan; Rouhe, Erkka; Seppänen, Jaakko; Martín-Neira, Manuel
Palabras claveGNSS-R
Altimetry
Interferometry
Radar
GPS
Galileo
Sea level
Fecha de publicación2-mar-2019
EditorMultidisciplinary Digital Publishing Institute
CitaciónRemote Sensing 11(5): 505 (2019)
ResumenThis paper evaluates the capability of interferometric global navigation satellite system reflectometry (GNSS-R) to perform sea surface altimetry in a synoptic scenario. Such purpose, which requires the combination of the results from different GNSS signals, constitutes a unique characteristic of this approach. Interferometric GNSS-R group delay altimetry has been proven to be more precise than conventional GNSS-R. However, the self-consistency and accuracy of their synoptic solutions (simultaneous multi-static results) have never been proved before. In our work, we analyze a dataset of GNSS signals reflected off the Baltic Sea acquired during an airborne campaign using a receiver that was developed for such a purpose. Among other features, it enables beamformer capability in post-processing to get multiple and simultaneous GNSS signals under the interferometric approach’s restrictions. In particular, the signals from two GPS and two Galileo satellites, at two frequency bands (L1 and L5), covering an elevation range between 28° and 83°, are processed to retrieve sea surface height estimations. The results obtained are self-consistent among the different GNSS signals and data tracks, with discrepancies between 0.01 and 0.26 m. Overall, they agree with ancillary information at 0.40 m level, following a characteristic height gradient present at the experimental site.
Versión del editorhttp://dx.doi.org/10.3390/rs11050505
URIhttp://hdl.handle.net/10261/178033
DOI10.3390/rs11050505
ISSN2072-4292
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