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Technical Note

Roll Calibration for CryoSat-2: A Comprehensive Approach

isardSAT S.L., Barcelona Advanced Industry Park, 08042 Barcelona, Spain
Aresys SRL, 20132 Milano, Italy
School of GeoSciences, University of Edinburgh, Drummond Street, Edinburgh EH8 9XP, UK
IPGS UMR 7516, Université de Strasbourg, CNRS, 67000 Strasbourg, France
ESA ESRIN, 00044 Frascati, Italy
Author to whom correspondence should be addressed.
Remote Sens. 2021, 13(2), 302;
Received: 29 November 2020 / Revised: 3 January 2021 / Accepted: 5 January 2021 / Published: 16 January 2021
(This article belongs to the Section Ocean Remote Sensing)
CryoSat-2 is the first satellite mission carrying a high pulse repetition frequency radar altimeter with interferometric capability on board. Across track interferometry allows the angle to the point of closest approach to be determined by combining echoes received by two antennas and knowledge of their orientation. Accurate information of the platform mispointing angles, in particular of the roll, is crucial to determine the angle of arrival in the across-track direction with sufficient accuracy. As a consequence, different methods were designed in the CryoSat-2 calibration plan in order to estimate interferometer performance along with the mission and to assess the roll’s contribution to the accuracy of the angle of arrival. In this paper, we present the comprehensive approach used in the CryoSat-2 Mission to calibrate the roll mispointing angle, combining analysis from external calibration of both man-made targets, i.e., transponder and natural targets. The roll calibration approach for CryoSat-2 is proven to guarantee that the interferometric measurements are exceeding the expected performance. View Full-Text
Keywords: SARIn; interferometry; CryoSat-2; roll; mispointing; transponder; swath SARIn; interferometry; CryoSat-2; roll; mispointing; transponder; swath
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MDPI and ACS Style

Garcia-Mondéjar, A.; Scagliola, M.; Gourmelen, N.; Bouffard, J.; Roca, M. Roll Calibration for CryoSat-2: A Comprehensive Approach. Remote Sens. 2021, 13, 302.

AMA Style

Garcia-Mondéjar A, Scagliola M, Gourmelen N, Bouffard J, Roca M. Roll Calibration for CryoSat-2: A Comprehensive Approach. Remote Sensing. 2021; 13(2):302.

Chicago/Turabian Style

Garcia-Mondéjar, Albert, Michele Scagliola, Noel Gourmelen, Jerome Bouffard, and Mònica Roca. 2021. "Roll Calibration for CryoSat-2: A Comprehensive Approach" Remote Sensing 13, no. 2: 302.

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