Dr. Laurent Lebègue Profile

Dr. Laurent Lebègue

at CNES

SPIE Involvement:

Author

Publications (10)

Proceedings Article | 21 November 2017 Open Access

Experience feedback on ccd detectors in orbit: focus on in-flight degradation of several cases of performance

A. Penquer, L. Lebègue, D. Herve, B. Fougnie

Proceedings Volume 10567, 105671L (2017) https://doi.org/10.1117/12.2308085

KEYWORDS: Sensors, CCD image sensors, Charge-coupled devices, Signal detection, Radiation effects, Oxides, Ionization, Stars, Annealing, Calibration

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Proceedings Article | 20 November 2017 Open Access

First in-flight results of Pleiades 1A innovative methods for optical calibration

Philippe Kubik, Laurent Lebègue, Sébastien Fourest, Jean-Marc Delvit, Françoise de Lussy, Daniel Greslou, Gwendoline Blanchet

Proceedings Volume 10564, 1056407 (2017) https://doi.org/10.1117/12.2309056

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The PLEIADES program is a space Earth Observation system led by France, under the leadership of the French Space Agency (CNES). Since it was successfully launched on December 17^th, 2011, Pleiades 1A high resolution optical satellite has been thoroughly tested and validated during the commissioning phase led by CNES. The whole system has been designed to deliver submetric optical images to users whose needs were taken into account very early in the design process. This satellite opens a new era in Europe since its off-nadir viewing capability delivers a worldwide 2- days access, and its great agility will make possible to image numerous targets, strips and stereo coverage from the same orbit. Its imaging capability of more than 450 images of 20 km x 20 km per day can fulfill a broad spectrum of applications for both civilian and defence users.

For an earth observing satellite with no on-board calibration source, the commissioning phase is a critical quest of wellcharacterized earth landscapes and ground patterns that have to be imaged by the camera in order to compute or fit the parameters of the viewing models. It may take a long time to get the required scenes with no cloud, whilst atmosphere corrections need simultaneous measurements that are not always possible.

The paper focuses on new in-flight calibration methods that were prepared before the launch in the framework of the PLEIADES program : they take advantage of the satellite agility that can deeply relax the operational constraints and may improve calibration accuracy. Many performances of the camera were assessed thanks to a dedicated innovative method that was successfully validated during the commissioning period : Modulation Transfer Function (MTF), refocusing, absolute calibration, line of sight stability were estimated on stars and on the Moon. Detectors normalization and radiometric noise were computed on specific pictures on Earth with a dedicated guidance profile. Geometric viewing frame was determined with a particular image acquisition combining different views of the same target.

All these new methods are expected to play a key role in the future when active optics will need sophisticated in-flight calibration strategy.

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Proceedings Article | 11 November 2014 Paper

Comparison of MODIS and PLEIADES Lunar observations

Xiaoxiong Xiong, Sophie Lachérade, Laurent Lebègue, Bertrand Fougnie, Amit Angal, Zhipeng Wang, Ouahid Aznay

Proceedings Volume 9241, 924111 (2014) https://doi.org/10.1117/12.2067442

KEYWORDS: MODIS, Calibration, Sensors, Reflectivity, Satellites, Space operations, Scanning laser ophthalmoscopy, Near infrared, Aerospace engineering, Photonic integrated circuits

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Proceedings Article | 7 October 2014 Paper

POLO: a unique dataset to derive the phase angle dependence of the Moon irradiance

S. Lachérade, O. Aznay, B. Fougnie, L. Lebègue

Proceedings Volume 9241, 924112 (2014) https://doi.org/10.1117/12.2067283

KEYWORDS: Calibration, Spatial resolution, Satellites, Sensors, Data modeling, Near infrared, Satellite imaging, Image resolution, Visible radiation, Detector arrays

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Proceedings Article | 23 September 2013 Paper

PLEIADES-HR 1A&1B image quality commissioning: innovative geometric calibration methods and results

Daniel Greslou, Françoise de Lussy, Virginie Amberg, Cécile Dechoz, Florie Lenoir, Jean-Marc Delvit, Laurent Lebègue

Proceedings Volume 8866, 886611 (2013) https://doi.org/10.1117/12.2023877

KEYWORDS: Calibration, Image quality, Satellites, Stars, Image registration, Satellite communications, Image processing, Satellite imaging, Data modeling, Sensors

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Proceedings Article | 23 September 2013 Paper

PLEIADES-HR 1A&1B image quality commissioning: innovative radiometric calibration methods and results

Vincent Martin, Gwendoline Blanchet, Philippe Kubik, Sophie Lacherade, Christophe Latry, Laurent Lebegue, Florie Lenoir, Florence Porez-Nadal

Proceedings Volume 8866, 886610 (2013) https://doi.org/10.1117/12.2023337

KEYWORDS: Satellites, Signal to noise ratio, Modulation transfer functions, Calibration, Sensors, Image quality, Image compression, Target acquisition, Point spread functions, Deconvolution

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Proceedings Article | 23 September 2013 Paper

PLEIADES satellites image quality commissioning

Laurent Lebègue, Daniel Greslou, Gwendoline Blanchet, Françoise de Lussy, Sébastien Fourest, Vincent Martin, Christophe Latry, Philippe Kubik, Jean-Marc Delvit, Cécile Dechoz, Virginie Amberg

Proceedings Volume 8866, 88660Z (2013) https://doi.org/10.1117/12.2023288

KEYWORDS: Satellites, Image quality, Satellite imaging, Calibration, Sensors, Image compression, Satellite communications, Stars, Clouds, Cartography

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Proceedings Article | 23 September 2013 Paper

In-flight attitude perturbances estimation: application to PLEIADES-HR satellites

V. Amberg, C. Dechoz, L. Bernard, D. Greslou, F. de Lussy, L. Lebegue

Proceedings Volume 8866, 886612 (2013) https://doi.org/10.1117/12.2023275

KEYWORDS: Satellites, Stars, Charge-coupled devices, Fourier transforms, Satellite communications, Satellite imaging, Staring arrays, Image quality, Gyroscopes, Detector arrays

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Proceedings Article | 4 November 2004 Paper

A new method for in-flight radiometric noise assessment: application to SPOT5

Véronique Pascal, Francois-Xavier Chaffaut, Philippe Kubik, Laurent Lebegue, Christophe Valorge, Mathieu Jung

Proceedings Volume 5570, (2004) https://doi.org/10.1117/12.565110

KEYWORDS: Signal to noise ratio, Interference (communication), Calibration, Sensors, Statistical methods, Image quality, Image processing, Image compression, Lamps, Satellites

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Proceedings Article | 8 April 2003 Paper

SPOT5: first in-flight radiometric image quality results

Veronique Pascal, Laurent Lebegue, Aime Meygret, Marie-Christine Laubies, Jean-Noel Hourcastagnou, Emmanuel Hillairet

Proceedings Volume 4881, (2003) https://doi.org/10.1117/12.462633

KEYWORDS: Signal to noise ratio, Calibration, Sensors, Image quality, Interference (communication), Satellites, Short wave infrared radiation, Satellite imaging, Signal detection, Image processing

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Showing 5 of 10 publications

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