Preliminary results of the 2013 Ibiza calibration campaign of Jason 2 and Saral altimeters

This study presents the results of the 2013 Ibiza (Western Mediterranean) calibration campaign of Jason-2 and SARAL altimeters. It took place from 14 to 16 September 2013 and comprised two phases: the calibration of the GNSS (Global Navigation Satellite System) buoys to estimate the antenna height of each of them and the absolute calibration to estimate the altimeter bias (i.e., the difference of sea level measured by radar altimetry and GNSS). The first one was achieved in the Ibiza harbor at a close vicinity of the Ibiza tide gauge and the second one was performed at ∼ 40 km at the northwest of Ibiza Island at a crossover point of Jason-2 and SARAL nominal groundtracks. Five buoys were used to delineate the crossover region and their measurements interpolated at the exact location of each overflight. The overflights occurred two consecutive days: 15 and 16 September 2013 for Jason-2 and SARAL, respectively. The GNSS data were processed using precise point positioning technique. The biases found are of (−0.1 ± 0.9) and (−3.1 ± 1.5) cm for Jason-2 and SARAL, respectively.

[1]  Stelios P. Mertikas,et al.  First Calibration Results for the SARAL/AltiKa Altimetric Mission Using the Gavdos Permanent Facilities , 2015 .

[2]  L. Amarouche,et al.  Improving the Jason-1 Ground Retracking to Better Account for Attitude Effects , 2004 .

[3]  P. Exertier,et al.  GPS-based sea level measurements to help the characterization of land contamination in coastal areas , 2013 .

[4]  Jan P. Weiss,et al.  Single receiver phase ambiguity resolution with GPS data , 2010 .

[5]  Chris Rizos,et al.  The International GNSS Service in a changing landscape of Global Navigation Satellite Systems , 2009 .

[6]  Bruce J. Haines,et al.  Precise Near-Real-Time Sea Surface Height Measurements from the Jason-1 and Jason-2/OSTM Missions , 2010 .

[7]  P. Mehra,et al.  Absolute Calibration of SARAL/AltiKa in Kavaratti During its Initial Calibration-Validation Phase , 2015 .

[8]  Pierre Exertier,et al.  Leveling the Sea Surface Using a GPS-Catamaran Special Issue: Jason-1 Calibration/Validation , 2003 .

[9]  Sylvain Loyer,et al.  An Integer Precise Point Positioning technique for sea surface observations using a GPS buoy , 2013 .

[10]  Pascal Bonnefond,et al.  Regional in situ validation of satellite altimeters: Calibration and cross-calibration results at the Corsican sites , 2013 .

[11]  K. Tseng,et al.  Satellite Altimetry , 2014 .

[12]  Pierre Exertier,et al.  SARAL/AltiKa Absolute Calibration from the Multi-Mission Corsica Facilities , 2015 .

[13]  Christian Rocken,et al.  Measuring precise sea level from a buoy using the Global Positioning System , 1990 .

[14]  Paul Tregoning,et al.  Absolute Calibration in Bass Strait, Australia: TOPEX, Jason-1 and OSTM/Jason-2 , 2011 .

[15]  J. Zumberge,et al.  Precise point positioning for the efficient and robust analysis of GPS data from large networks , 1997 .

[16]  J.-P. Berthias,et al.  Integer Ambiguity Resolution on Undifferenced GPS Phase Measurements and Its Application to PPP and Satellite Precise Orbit Determination , 2007 .

[17]  Yves Menard,et al.  Calibration of the TOPEX/POSEIDON altimeters at Lampedusa: Additional results at Harvest , 1994 .

[18]  Penina Axelrad,et al.  Calibration of the TOPEX altimeter using a GPS buoy , 1994 .

[19]  Flavien Mercier,et al.  Real Time Zero-difference Ambiguities Fixing and Absolute RTK , 2008 .

[20]  Panagiotis Partsinevelos,et al.  Statistical Models and Latest Results in the Determination of the Absolute Bias for the Radar Altimeters of Jason Satellites using the Gavdos Facility , 2010 .

[21]  John C. Ries,et al.  Chapter 1 Satellite Altimetry , 2001 .

[22]  Ernesto Rodriguez,et al.  Altimetry for non‐Gaussian oceans: Height biases and estimation of parameters , 1988 .

[23]  G. Brown.  The average impulse response of a rough surface and its applications , 1977 .

[24]  Bruce J. Haines,et al.  The Harvest Experiment: Calibration of the Climate Data Record from TOPEX/Poseidon, Jason-1 and the Ocean Surface Topography Mission , 2010 .

[25]  Yves Menard,et al.  Ibiza Absolute Calibration Experiment: Survey and Preliminary Results , 2004 .

[26]  David Griffin,et al.  The SARAL/AltiKa Altimetry Satellite Mission , 2015 .

[27]  Frédéric Frappart,et al.  Preliminary Assessment of SARAL/AltiKa Observations over the Ganges-Brahmaputra and Irrawaddy Rivers , 2015 .

[28]  Chris Rizos,et al.  Real‐time failure detection in the carrier phase measurements of GPS by robust and conventional kalman state estimates , 1998 .

[29]  Jean-Charles Marty,et al.  Zero-difference GPS ambiguity resolution at CNES–CLS IGS Analysis Center , 2012, Journal of Geodesy.

[30]  Pierre Prandi,et al.  SARAL/AltiKa Global Statistical Assessment and Cross-Calibration with Jason-2 , 2015 .