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Volume 12
Issue 16
10.3390/rs12162510
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Article

Sentinel-3A/B SLSTR Pre-Launch Calibration of the Thermal InfraRed Channels

by
Dave Smith
1,*,
Marc Barillot
2,
Stephane Bianchi
2,
Fabio Brandani
3,
Peter Coppo
3,
Mireya Etxaluze
1,
Johannes Frerick
4,
Steffen Kirschstein
5,
Arrow Lee
1,
Brian Maddison
1,
Elliot Newman
1,
Tim Nightingale
1,
Dan Peters
1 and
Ed Polehampton
1
1
Science and Technology Facilities Council (STFC), Rutherford Appleton Laboratory Space (RAL Space), Harwell Oxford OX11 0QX, UK
2
Thales Alenia Space—France, 5 Allée des Gabians, 06150 Cannes, France
3
Leonardo Company, Via Albert Einstein, 35, 50013 Campi Bisenzio, Firenze, Italy
4
European Space Agency, European Space Research and Technology Centre (ESA ESTEC), Keplerlaan 1, 2201 AZ Noordwijk, The Netherlands
5
Jena-Optronik GmbH, Otto-Eppenstein-Straße 3, 07745 Jena, Germany
*
Author to whom correspondence should be addressed.
Remote Sens. 2020, 12(16), 2510; https://doi.org/10.3390/rs12162510
Submission received: 26 June 2020 / Revised: 21 July 2020 / Accepted: 27 July 2020 / Published: 5 August 2020
(This article belongs to the Special Issue Remote Sensing of Atmosphere and Underlying Surface Using OLCI and SLSTR on Board Sentinel-3: Calibration, Algorithms, Geophysical Products and Validation)
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Abstract

The first two models of the Sea and Land Surface Temperature Radiometers (SLSTR) for the European Copernicus Sentinel-3 missions were tested prior to launch at the Rutherford Appleton Laboratory space instrument calibration facility. The pre-launch tests provide an essential reference that ensures that the flight data of SLSTR are calibrated to the same standards needed for surface temperature measurements and to those used by shipborne radiometers for Fiducial Reference Measurement (FRM). The radiometric calibrations of the thermal infrared channels were validated against accurate and traceable reference BB sources under flight representative thermal vacuum environment. Measurements were performed in both earth views for source temperatures covering the main operating range, for different instrument configurations and for the full field-of-view of the instruments. The data were used to derive non-linearity curves to be used in the level-1 processing. All results showed that the measured brightness temperatures and radiometric noise agreed within the requirements for the mission. An inconsistency that particularly affected SLSTR-A was observed which has been attributed to an internal stray light error. A correction for the stray light has been proposed to reduce the error. The internal stray light error was reduced for SLSTR-B by replacing the coating on the main aperture stop. We present a description of the test methodology and the key results.
Keywords: calibration; infrared; temperature; SLSTR; sentinel-3; radiometric; Copernicus; uncertainty; stray-light calibration; infrared; temperature; SLSTR; sentinel-3; radiometric; Copernicus; uncertainty; stray-light
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MDPI and ACS Style

Smith, D.; Barillot, M.; Bianchi, S.; Brandani, F.; Coppo, P.; Etxaluze, M.; Frerick, J.; Kirschstein, S.; Lee, A.; Maddison, B.; et al. Sentinel-3A/B SLSTR Pre-Launch Calibration of the Thermal InfraRed Channels. Remote Sens. 2020, 12, 2510. https://doi.org/10.3390/rs12162510

AMA Style

Smith D, Barillot M, Bianchi S, Brandani F, Coppo P, Etxaluze M, Frerick J, Kirschstein S, Lee A, Maddison B, et al. Sentinel-3A/B SLSTR Pre-Launch Calibration of the Thermal InfraRed Channels. Remote Sensing. 2020; 12(16):2510. https://doi.org/10.3390/rs12162510

Chicago/Turabian Style

Smith, Dave, Marc Barillot, Stephane Bianchi, Fabio Brandani, Peter Coppo, Mireya Etxaluze, Johannes Frerick, Steffen Kirschstein, Arrow Lee, Brian Maddison, and et al. 2020. "Sentinel-3A/B SLSTR Pre-Launch Calibration of the Thermal InfraRed Channels" Remote Sensing 12, no. 16: 2510. https://doi.org/10.3390/rs12162510

APA Style

Smith, D., Barillot, M., Bianchi, S., Brandani, F., Coppo, P., Etxaluze, M., Frerick, J., Kirschstein, S., Lee, A., Maddison, B., Newman, E., Nightingale, T., Peters, D., & Polehampton, E. (2020). Sentinel-3A/B SLSTR Pre-Launch Calibration of the Thermal InfraRed Channels. Remote Sensing, 12(16), 2510. https://doi.org/10.3390/rs12162510

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