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13 October 2008An alternative procedure for the estimation of the altimeter bias for the Jason-1 satellite using the dedicated calibration site at Gavdos
The dedicated calibration site for satellite radar altimeters in Gavdos has been operational since 2004. The small island
of Gavdos is located along a repeating ground track of Jason satellites (crossover point No.109 ascending and No.18
descending pass and adjacent to Envisat), and additionally where the altimeter and radiometer footprints do not
experience significant land intrusion. The purpose of such permanent Cal/Val facility is to calibrate the sea-surface
height and ancillary measurements made by the satellite as it passes overhead, by using observations from tide gauges,
GPS, DORIS and other sensors directly placed under the satellite ground tracks.
Up to now, altimeter calibration at Gavdos has been performed by averaging gridded sea-level anomalies as produced by
the satellite altimeter measurements and then comparing the result with the tide gauge observations. The absolute
altimeter bias has thus been previously estimated to be +121 mm ±10 mm for Jason-1 satellite.
In this work, the absolute altimeter bias of Jason-1 has been determined using (1) approximately one year of sea-surface
height observations; (2) the GDR-B altimeter record and the seasonal effects of sea level; and (3) an alternative approach
for calibration by interpolating each individual altimetric correction given by the satellite at its point of closest approach
over the corresponding value of the tide gauge observation.
Stelios P. Mertikas,Ath. Papadopoulos, andErricos C. Pavlis
"An alternative procedure for the estimation of the altimeter bias for the Jason-1 satellite using the dedicated calibration site at Gavdos", Proc. SPIE 7105, Remote Sensing of the Ocean, Sea Ice, and Large Water Regions 2008, 71050H (13 October 2008); https://doi.org/10.1117/12.799495
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Stelios P. Mertikas, Ath. Papadopoulos, Erricos C. Pavlis, "An alternative procedure for the estimation of the altimeter bias for the Jason-1 satellite using the dedicated calibration site at Gavdos," Proc. SPIE 7105, Remote Sensing of the Ocean, Sea Ice, and Large Water Regions 2008, 71050H (13 October 2008); https://doi.org/10.1117/12.799495