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Recent Developments for the estimation of the altimeterbias for the Jason-1&2 satellites using the dedicated calibration site at Gavdos

Partsinevelos Panagiotis, Mertikas Stelios, Tripolitsiotis Achilleas, Ioannides Rigas , Tziavos Ilias N. , Vergos Georgios S. , Hausleitner Walter

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Περίληψη

The dedicated calibration site for satellite radar altimeters in Gavdos has been operational as of 2004. The small island ofGavdos is located along a repeating ground track of Jason satellites (crossover point No 109 ascending and No. 18descending pass and adjacent to Envisat), and where the altimeter and radiometer footprints do not experience significantland intrusion. The purpose of such permanent Cal/Val facility is to calibrate the sea-surface height and ancillarymeasurements made by the satellite as it passes overhead, by using observations from tide gauges, GPS, DORIS andother sensors directly placed under the satellite ground tracks.The successful launch of Jason-2 satellite (20 June, 2008) initiated its calibration-validation phase. This was achievedhaving the two satellites flying with less than one minute difference and in the same orbit. Using the Gavdos calibrationfacility the following have been determined: (1) the absolute altimeter bias of Jason-1 satellite for the cycles 209-259;using GDR-C data; (2) the absolute altimeter bias of Jason-2 satellite for the cycles 2-28 using GDR-A data ; (3) theinter- mission bias for the period July 2008 – January 2009.The expansion of the Gavdos Cal/Val facilities with the deployment of a new site in the south of Crete and along passNo. 109 is also presented in this work.

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