Mr. Sébastien Marcq Profile

Sébastien Marcq

at Ctr National d'Études Spatiales

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Publications (7)

Proceedings Article | 12 July 2023 Open Access

TRISHNA TIR instrument development and performance status

Didier Charvet, Xavier Gnata, Arthur Toulemont, Serena Rizzolo, Antoine Clénet, Clément Libouban, Alain Gossant, François Chassat, Laurence Buffet, Corinne Salcedo, Sébastien Marcq, Renaud Binet, Aurélien Ledot, Thierry Carlier

Proceedings Volume 12777, 1277742 (2023) https://doi.org/10.1117/12.2690642

KEYWORDS: Equipment, Cryostats, Tunable filters, Design and modelling, Cryocoolers, Mirrors, Instrument modeling, Optical filters, Astronomical imaging, Manufacturing

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Proceedings Article | 7 October 2019 Presentation + Paper

Development of calibration methods using specular reflection over the ocean for the Multiviewing, Multichannel, Multipolarization Imager (3MI) of the EUMETSAT Polar System – Second Generation (EPS-SG)

Mohamed Djellali, Jérôme Riedi, Sébastien Marcq, Bertrand Fougnie, Souichiro Hioki, Jean-Marc Nicolas

Proceedings Volume 11155, 1115504 (2019) https://doi.org/10.1117/12.2532501

KEYWORDS: Calibration, Specular reflections, Imaging systems, Sun, Aerosols, Radiometry, Atmospheric particles, Statistical analysis, Climatology, Earth's atmosphere

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Proceedings Article | 9 September 2019 Presentation + Paper

Straylight physical model and simulator for a rapid and flexible evaluation of impacts on the products derived from the EPS-SG/3MI instrument

Bertrand Fougnie, Antoine Lacan, Thierry Marbach, Alessio Canestri, Sébastien Marcq

Proceedings Volume 11127, 111270M (2019) https://doi.org/10.1117/12.2529471

KEYWORDS: Sensors, Reflectivity, Device simulation, Short wave infrared radiation, Polarization, Instrument modeling, Picture Archiving and Communication System, Satellites, Ray tracing, Signal to noise ratio

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The 3MI instrument is a multi-directional spectro-polarimeter to fly on-board the Metop-SG platform to be launched in 2022, as part of EUMETSAT’s EPS-SG system space segment. As for most of radiometers devoted to Earth Observing from space, the radiometric budget is a system budget which includes many contributors, from the raw detector signal-to-noise to the artefact introduced by the ground correction in level-1 processing. The straylight happening in the optics is one of these contributors which could sometimes become dominant in the system budget. In this context, it is required to constrain the instrumental design as well as the ground characterization and its correction by processing. This is supported by maintaining accurate understanding of the straylight and its behaviour from early on in the project in order to check its radiometric level and quantify the potential impact on the products. This paper will present the analysis done to understand and model the physical behaviour of 3MI’s straylight. Based on initial inputs from the instrument builders and assuming some simplification, a physical straylight model was derived. This model allows an easy implementation in a simulator able to add this straylight contribution to any type of images, particularly on very realistic scenes. Our physical model shows advantageous complementarity to the builder’s simulations in the sense it allows a better quantification on a wide variety of realistic images while specifications usually assume theoretical targets such as a knife-edge transition. Such a capability is needed for 3MI system activities, in particular to cope with any deviation to the performance requirements. This paper presents examples of 3MI straylight-impacted images simulated at EUMETSAT using as input 1/ a simulation of the straylight provided by the instrument builder (ESA and Leonardo), and 2/ a realistic test data set based on PARASOL and MODIS acquisitions from the A-train observatory generated by ICARE/LOA. This simulator will be used during the development of the 3MI instrument and its ground characterization in order to monitor the impact on products.

Proceedings Article | 25 September 2018 Paper

VENµS in orbit radiometric calibration

Philippe Gamet, Arthur Dick, Sébastien Marcq, Olivier Hagolle, Jean-Louis Raynaud, Emmanuel Hillairet, Silvia Juglea, Jean-Pascal Burochin

Proceedings Volume 10785, 1078513 (2018) https://doi.org/10.1117/12.2324118

KEYWORDS: Calibration, Clouds, Signal to noise ratio, Sensors, Venus, Detection and tracking algorithms, Polarization, Reflectivity, Image processing

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Proceedings Article | 12 October 2015 Paper

Sentinel-2/MSI absolute calibration: first results

V. Lonjou, S. Lachérade, B. Fougnie, P. Gamet, S. Marcq, J.-L. Raynaud, T. Tremas

Proceedings Volume 9639, 963906 (2015) https://doi.org/10.1117/12.2194968

KEYWORDS: Landsat, Calibration, Sensors, Diffusers, Satellites, Sun, Reflectivity, Photometry, Earth observing sensors, Bidirectional reflectance transmission function

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Proceedings Article | 12 October 2015 Paper

Preparation of a new autonomous instrumented radiometric calibration site: Gobabeb, Namib Desert

Claire Greenwell, Agnieszka Bialek, Amelia Marks, Emma Woolliams, Béatrice Berthelot, Aimé Meygret, Sébastien Marcq, Marc Bouvet, Nigel Fox

Proceedings Volume 9639, 963919 (2015) https://doi.org/10.1117/12.2194885

KEYWORDS: Calibration, Spectroscopy, Sensors, Nanolithography, Sun, Temperature metrology, Reflectivity, Photometry, Satellites, Short wave infrared radiation

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Proceedings Article | 12 October 2015 Paper

Sentinel-2 radiometric image quality commissioning: first results

S. Lachérade, V. Lonjou, M. Farges, P. Gamet, S. Marcq, J.-L. Raynaud, T. Trémas

Proceedings Volume 9639, 963905 (2015) https://doi.org/10.1117/12.2194698

KEYWORDS: Calibration, Satellites, Signal to noise ratio, Diffusers, Modulation transfer functions, Short wave infrared radiation, Sensors, Image quality, Bridges, Satellite imaging

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