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Título

Bases de calibración de altímetros en Cabo de Begur e Ibiza

Otros títulosCalibration altimeter sites at Cape of Begur and Ibiza Island
AutorMartínez Benjamín, Juan José; Martínez García, Marina; Ortiz Castellón, Miquel Angel; Rodríguez Velasco, Gema ; Martín Dávila, José; Bonnefond, Pascal; Pérez Gómez, Begoña; García Silva, Cristina
Palabras claveAltimetry
Calibration
Geoid
GPS
Tide gauges
GPS Buoys
Geodesia
Geofísica
Fecha de publicación2007
EditorCSIC-UCM - Instituto de Astronomía y Geodesia (IAG)
CitaciónPublicacion. Instituto de Astronomía y Geodesia. 2007, nº202.
ResumenIn this work the three Begur Cape experiments on radar altimeter calibration are overwied. These campaigns were conducted on 16-19'10March 1999 (first altimeter calibration ever developed in Spain), on 4_110July 2000 (first TOPEX Altimeter side-B calibration ever made in the Mediterranean Sea and marine geoid mapping) and the last 25-28'10August 2002 (in-situ Jason-1 Altimeter calibration). The in-si/u or direct absolute calibration estimating the TOPEX Alt-B bias was performed during the overflights by using GPS buoys. The advantage of that method is that neither geoid modelling nor tidal error is needed. Other main objective ofthese campaigns was /0 map the profile of the Mean Sea Surface (mss) along the closest ascending TIP groundtrack (15-20 km far from the coast). For that purpose coastal tide gauge measurements were required to connec/ the instan/aneous sea surface measured by the buoy with the time independent mss. Mapping the marine surface for indirect altimeter calibration has de advantage of allowing the calibration of any radar sensor that crosses the studied area but, in turn, the disadvantage is that the method requires ocean tide and geoid knowledge, which reduces the accuracy of the bias estima le by afactor of two. A Spanish JASON-1 geoid gradient campaign with French support has been made in June 2003 at the Ibiza island in the NW Mediterranean Sea. The main objective has been /0 map with a new designed, builded and calibrated GPS catamaran, the local geoid gradient in three areas around 1biza island under the ascending (187) and descending (248) Jasonl ground tracks. The ea/amaran equipped with two GPS antennas to perform continuous sea level measurements was towed by the Patrol Deva from the Spanish Navy. Five GPS reference stations were deployed on Ibiza island: one in Portinatx, two in San An/onio and two in 1biza. The marine geoid has been used to relate the coastal tide gauge datafrom [biza and San Antonio harbours /0 off-shore altimetric da/a. In the framework of the campaign, the levelling of the [biza and San An/onio tide gauges to the respective GPS markers was performed. We presen/ synthesis of the results obtained from TopexlPoseidon and the first results on Jason-1 altimeter calibra/ion using the direct measurements from GPS buoys and the derived marine geoid. The [biza results agree relatively well with results obtained a/ Corsica, Harvest and Bass Strait calibration permanent si/es. Moreover, the geodetic activities (e.g., GPS, levelling) has permitted to build a very accurate (few mili) local network linked to the European one, with a reference frame compatible with the satellite altimetry missions (ITRF2000). The GPS kinematic data were processed using two different softwares allowing to check the consistency of the solutions. A perspective of a new Jason-1, including Envisat, Ibiza campaign to be made around 2007 will be presented.
DescripciónMARTÍNEZ BENJAMÍN, J.J. [et al.]. "Bases de calibración de altímetros en Cabo de Begur e Ibiza". En: 5ª Asamblea Hispano Portuguesa de Geodesia y Geofísica, (Sevilla, 30 de enero - 3 de febrero de 2006)
URIhttp://hdl.handle.net/10261/23326
ISSN0213-6198
Aparece en las colecciones: (IAG) Comunicaciones congresos
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