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Remote Sens. 2017, 9(6), 607;

Sentinel-1A/B Combined Product Geolocation Accuracy

Remote Sensing Laboratories, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
ESA-ESRIN, Via Galileo Galilei, 00044 Frascati, Italy
ESA-ESTEC, Keplerlaan 1, 2200 AG Noordwijk, The Netherlands
Author to whom correspondence should be addressed.
Academic Editors: Bruce Chapman, Paul Siqueira and Prasad S. Thenkabail
Received: 28 April 2017 / Revised: 9 June 2017 / Accepted: 9 June 2017 / Published: 14 June 2017
(This article belongs to the Special Issue Calibration and Validation of Synthetic Aperture Radar)
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Sentinel-1A and -1B are twin spaceborne synthetic aperture radar (SAR) sensors developed and operated by the European Space Agency under the auspices of the Copernicus Earth observation programme. Launched in April 2014 and April 2016, Sentinel-1A and -1B are currently operating in tandem, in a common orbital configuration to provide an increased revisit frequency. In-orbit commissioning was completed for each unit within months of their respective launches, and level-1 SAR products generated by the operational SAR processor have been geometrically calibrated. In order to compare and monitor the geometric characteristics of the level-1 products from both units, as well as to investigate potential improvements, products from both satellites have been monitored since their respective commissioning phases. In this study, we present geolocation accuracy estimates for both Sentinel-1 units based on the time series of level-1 products collected thus far. While both units were demonstrated to be performing consistently, and providing SAR data products according to the nominal product specifications, a subtle beam- and mode-dependent azimuth bias common to the data from both units was identified. A method for removing the bias is proposed, and the corresponding improvement to the geometric accuracies is demonstrated and quantified. View Full-Text
Keywords: Synthetic Aperture Radar (SAR); Sentinel-1; geolocation calibration/validation Synthetic Aperture Radar (SAR); Sentinel-1; geolocation calibration/validation

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Schubert, A.; Miranda, N.; Geudtner, D.; Small, D. Sentinel-1A/B Combined Product Geolocation Accuracy. Remote Sens. 2017, 9, 607.

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