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Roll Calibration for CryoSat-2: A Comprehensive Approach

Abstract : 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.
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https://hal-insu.archives-ouvertes.fr/insu-03228860
Contributor : Nathalie Pothier <>
Submitted on : Tuesday, May 18, 2021 - 2:26:37 PM
Last modification on : Wednesday, May 19, 2021 - 3:27:21 AM

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Albert Garcia-Mondéjar, Michele Scagliola, Noel Gourmelen, Jerome Bouffard, Mònica Roca. Roll Calibration for CryoSat-2: A Comprehensive Approach. Remote Sensing, MDPI, 2021, 13 (2), pp.302. ⟨10.3390/rs13020302⟩. ⟨insu-03228860⟩

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