Mr. Vincent Chorvalli Profile

Vincent Chorvalli

at Airbus Defence and Space Satellites

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Author

Publications (12)

Proceedings Article | 12 July 2023 Open Access

The LSTM instrument: design, technology and performance

Francois Bernard, Guillaume Bourgeois, Ilias Manolis, Itziar Barat, Ana Bolea Alamanac, Miguel Such-Taboada, Pilar Mingorance, Alessandra Ciapponi, Tiziana Cardone, Etienne Dutruel, Gianluca Furano, Adrian Garcia, Pascal Hallibert, Arvid Hammar, David Merodio Codinachs, Sandro Patti, Piotr Skrzypek, Thierry Tirolien, Vincent Chorvalli, Sophie De Zotti, Emilie Steck, Nicolas Guardiola, Pierre-Olivier Antoine, Jean-Christophe Nonnet, Michael Seymour, Olivier Gry, Paul Jougla, Oriol Alvarez Trotta, Isabel Cabeza Vega

Proceedings Volume 12777, 1277740 (2023) https://doi.org/10.1117/12.2690632

KEYWORDS: Equipment, Signal to noise ratio, Calibration, Short wave infrared radiation, Modulation transfer functions, Design and modelling, Astronomical imaging, Thermography, Tunable filters, Telescopes

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Proceedings Article | 13 April 2018 Paper

SILEX in-orbit performances

Gilles Planche, Vincent Chorvalli

Proceedings Volume 10568, 105682J (2018) https://doi.org/10.1117/12.2500113

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Proceedings Article | 5 January 2018 Open Access

The telescope of the multispectral instrument

Vincent Cazaubiel, Francis Delbru, F. Camus, V. Chorvalli, S. Thomas, C. Haas, Ph. Martimort, V. Kirschner

Proceedings Volume 10564, 105640U (2018) https://doi.org/10.1117/12.2309279

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Proceedings Article | 29 November 2017 Open Access

Optical communications between an aircraft and a geo relay satellite: design and flight results of the LOLA demonstrator

L. Vaillon, G. Planche, V. Chorvalli, L. Le Hors

Proceedings Volume 10566, 1056619 (2017) https://doi.org/10.1117/12.2308195

KEYWORDS: Satellites, Space telescopes, Telescopes, Atmospheric propagation, Optical communications, Relays, Satellite communications, Sensors, Atmospheric optics, Silicon carbide

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Proceedings Article | 21 November 2017 Open Access

LOLA: a 40.000 km optical link between an aircraft and a geostationary satellite

Vincent Cazaubiel, Gilles Planche, Vincent Chorvalli, Lénaïc Le Hors, Bernard Roy, Emmanuel Giraud, Ludovic Vaillon, Francois Carre, Eric Decourbey

Proceedings Volume 10567, 1056726 (2017) https://doi.org/10.1117/12.2308161

KEYWORDS: Atmospheric optics, Optical communications, Satellites, Atmospheric propagation, Atmospheric modeling, Electronics, Optical tracking, Telescopes, Semiconductor lasers, Sensors

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Proceedings Article | 21 November 2017 Open Access

The multispectral instrument of the Sentinel2 program

V. Cazaubiel, Vincent Chorvalli, Christophe Miesch

Proceedings Volume 10566, 105660H (2017) https://doi.org/10.1117/12.2308278

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The Sentinel-2 program will provide a permanent record of comprehensive data to help inform the agricul-tural sector (utilisation, coverage), forestry industry (population, damage, forest fires), disaster control (management, early warning) and humanitarian relief programmes. Sentinel-2 will also be able to observe natural disasters such as floods, volcanic eruptions, subsidence and landslides.

In the Sentinel-2 mission programme, Astrium in Friedrichshafen is responsible for the satellite’s system design and platform, as well as for satellite integration and testing. Astrium Toulouse will supply the Multi-Spectral imaging Instrument (MSI), and Astrium Spain will be in charge of the satellite’s structure and will produce its thermal equipment and cable harness. The industrial core team also comprises Jena Optronik (Germany), Boostec (France), Sener and GMV (Spain). Sentinel-2 is intended to image the Earth’s landmasses from its orbit for at least 7.25 years. In addition, its onboardresources will be designed so that the mission can be prolonged by an extra five years. From 2012 onwards, the 1.1-metric-ton satellite will circle the Earth in a sun-synchronous, polar orbit at an altitude of 786kilometres, fully covering the planet’s landmasses in just ten days. The multi-spectral instrument (MSI) will generate optical images in 13 spectral channels in the visible and shortwave infrared range down to a resolution of 10 metres with an image width of 290 kilometres.

The instrument is composed of two main parts:

• The telescope assembly , combining in one instrument both VNIR and SWIR channels, is mounted on the upper plate of the Bus

• The Video and Compression Electronic Units mounted inside the Bus.

This telescope is based on a Three Mirror Anastigmat optical concept. This three mirror optical combination is corrected from spherical aberration, coma and astigmatism. It provides a large field of view with very good optical quality. The telescope mirrors and structural baseplate are made of Silicon Carbide material in order to minimise thermo-elastic distortions. Isostatic mounts decouple the instrument from potential deformations of the platform upper plate.

The optical beam is spectrally separated thanks to a dichroic filter towards two different focal planes with different detector technologies: Silicon is used for the VNIR domain whereas Mercury Cadmium Telluride is required for the SWIR spectral domain. The VNIR detector is a CMOS device. The SWIR detector is a hybridised component where the MCT photosensitive arrays are hybridised on top of a CMOS circuit. The separation of the individual spectral bands(10 spectral bands, for the VNIR detectors and 3 spectral bands for the SWIR detectors) is performed by specific strip filters mounted on top of the detectors. The telescope is thermally decoupled from the external environment and the platform thanks to a thermal enclosure. A calibration and shutter mechanism avoids direct sun incidence inside the telescope during launch, specific platform manoeuvres and safe mode. The video signals coming out of the VNIR and SWIR focal planes are digitised and compressed inside the Video and Electronic Units prior to be sent to the bus.

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Proceedings Article | 20 November 2017 Open Access

The multispectral instrument of the Sentinel2 EM program results

Vincent Chorvalli, Stéphane Espuche, Francis Delbru, Philippe Martimort, Valerie Fernandez, Volker Kirchner

Proceedings Volume 10564, 1056408 (2017) https://doi.org/10.1117/12.2309187

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Proceedings Article | 17 November 2017 Open Access

VNIR focal plane results from the multispectral instrument of the Sentinel2 mission

S. Espuche, V. Chorvalli, A. Laborie, F. Delbru, S. Thomas, J. Sagne, C. Haas, P. Martimort, V. Fernandez, V. Kirchner

Proceedings Volume 10563, 105630I (2017) https://doi.org/10.1117/12.2304173

KEYWORDS: Staring arrays, Modulation transfer functions, Signal to noise ratio, Multispectral imaging, Sensors, Polonium, Astronomical imaging, Satellites, Defense and security, Short wave infrared radiation

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Proceedings Article | 24 October 2013 Paper

Sentinel-2 diffuser on-ground calibration

E. Mazy, F. Camus, V. Chorvalli, I. Domken, A. Laborie, S. Marcotte, Y. Stockman

Proceedings Volume 8889, 88890W (2013) https://doi.org/10.1117/12.2028854

KEYWORDS: Bidirectional reflectance transmission function, Diffusers, Calibration, Short wave infrared radiation, Multispectral imaging, Sensors, Reflectivity, Environmental monitoring, Imaging systems, Manufacturing

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Proceedings Article | 16 October 2013 Paper

The multispectral instrument of the Sentinel-2 PFM program results

V. Chorvalli, A. Laborie, S. Espuche, F. Delbru, C. Haas, P. Martimort, V. Fernandez, V. Kirshner

Proceedings Volume 8889, 88890M (2013) https://doi.org/10.1117/12.2028845

KEYWORDS: Multispectral imaging, Staring arrays, Short wave infrared radiation, Sensors, Modulation transfer functions, Signal to noise ratio, Telescopes, Mirrors, Vignetting, Satellites

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Proceedings Article | 13 October 2010 Paper

Design and development of the Sentinel-2 Multi Spectral Instrument and satellite system

Vincent Chorvalli, Vincent Cazaubiel, Stefan Bursch, Mario Welsch, Heinz Sontag, Philippe Martimort, Umberto Del Bello, Omar Sy, Paolo Laberinti, François Spoto

Proceedings Volume 7826, 78260J (2010) https://doi.org/10.1117/12.865749

KEYWORDS: Satellites, Mirrors, Telescopes, Sensors, Calibration, Short wave infrared radiation, Silicon carbide, Landsat, Visible radiation, Earth observing sensors

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Proceedings Article | 26 April 1999 Paper

SILEX final ground testing and in-flight performance assessment

Gilles Planche, Bernard Laurent, Jean-Claude Guillen, V. Chorvalli, Eric Desplats

Proceedings Volume 3615, (1999) https://doi.org/10.1117/12.346204

KEYWORDS: Telecommunications, Satellites, Thermography, Performance modeling, Error analysis, Head, Optical testing, Optical communications, Systems modeling, Optical tracking

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Showing 5 of 12 publications

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