Validating a New GNSS-Based Sea Level Instrument (CalNaGeo) at Senetosa Cape
| Type | Article | ||||||||||||
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| Date | 2022-03 | ||||||||||||
| Language | English | ||||||||||||
| Author(s) | Bonnefond Pascal1, Laurain Olivier2, Exertier Pierre3, Calzas Michel4, Guinle Thierry5, Picot Nicolas5 | ||||||||||||
| Affiliation(s) | 1 : aSYRTE, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universites, UPMC Univ. Paris 06, LNE, Paris, France 2 : bUniversite Cote d’Azur, Observatoire de la C^ote d’Azur, CNRS, IRD, Geoazur, Valbonne, France 3 : Geosciences Environnement Toulouse (GET), Universite de Toulouse, CNRS, IRD, CNES, UT3 - Paul Sabatier (UPS), Toulouse, France 4 : DT INSU, Batiment IPEV, Plouzane, France; 5 : CNES, Centre Spatial de Toulouse, Toulouse Cedex 9, France |
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| Source | Marine Geodesy (0149-0419) (Taylor & Francis Inc), 2022-03 , Vol. 45 , N. 2 , P. 121-150 | ||||||||||||
| DOI | 10.1080/01490419.2021.2013355 | ||||||||||||
| WOS© Times Cited | 3 | ||||||||||||
| Keyword(s) | Calibration and validation, GNSS, satellite altimetry, marine geoid, water level | ||||||||||||
| Abstract | The geodetic Corsica site was set up in 1998 in order to perform altimeter calibration of the TOPEX/Poseidon (T/P) mission and subsequently, Jason-1, OSTM/Jason-2, Jason-3 and more recently Sentinel-6 Michael Freilich (launched on November, 21 2020). The aim of the present study held in June 2015 is to validate a recently developed GNSS-based sea level instrument (called CalNaGeo) that is designed with the intention to map Sea Surface Heights (SSH) over large areas. This has been undertaken using the well-defined geodetic infrastructure deployed at Senetosa Cape, and involved the estimation of the stability of the waterline (and thus the instantaneous separation of a GNSS antenna from water level) as a function of the velocity at which the instrument is towed. The results show a largely linear relationship which is approximately 1 mm/(m/s) up to a maximum practical towing speed of similar to 10 knots (similar to 5 m/s). By comparing to the existing "geoid" map, it is also demonstrated that CalNaGeo can measure a sea surface slope with a precision better than 1 mm/km (similar to 2.5% of the physical slope). Different processing techniques are used and compared including GNSS Precise Point Positioning (PPP, where the goal is to extend SSH mapping far from coastal GNSS reference stations) showing an agreement at the 1-2 cm level. |
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