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Absolute Calibration of SARAL/AltiKa in Kavaratti During its Initial Calibration-Validation Phase

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The Kavaratti calibration-validation site in India at Lakshadweep Sea has been improved to carry out absolute calibration of SARAL/AltiKa altimeter. This site is augmented with a down-looking radar gauge and a permanent GPS receiver. The Kavaratti Island is located near a repeating ground track of SARAL/AltiKa and ∼12 km away from the point of closest measurement of Jason-2, SARAL/AltiKa crossover point. Additionally, the altimeter and radiometer footprints do not experience any land contamination. This article aims at presenting the initial calibration-validation results over cycles 001-011 of AltiKa. The absolute sea surface height bias has been found to be −48 mm at Kavaratti calibration site. In this preliminary study the effect of environmental variables such as winds and pressure are not considered in calculations.
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Keywords: Absolute; AltiKa; GPS; Kavaratti; calibration; tide gauge

Document Type: Research Article

Affiliations: 1: Space Applications Centre (ISRO), Ahmedabad, India 2: Observatoire de La Côte d'Azur – Géoazur, Grasse, France 3: Laboratoire d'Etudes en Géophysique et Océanographie Spatiales (LEGOS) UMR5566 (CNES/CNRS/IRD/UPS), Toulouse, France 4: National Institute of Oceanography, Goa, India

Publication date: September 10, 2015

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