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1. Imaging the interior of small Solar bodies: towards a quantitative approach

Author

Liisa-Ida Sorsa, Sampsa Pursiainen, J.-M. Geffrin, Wlodek Kofman, Alain Herique, Christelle Eyraud, Institut FRESNEL (FRESNEL), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Institut de Planétologie et d'Astrophysique de Grenoble (IPAG), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), and Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU)

Subjects
Solar System, Astrobiology, law.invention, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, [SDU.STU.PL]Sciences of the Universe [physics]/Earth Sciences/Planetology, Aerospace electronics, Asteroid, Remote sensing (archaeology), law, [SDU]Sciences of the Universe [physics], Radar, [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing, Geology, ComputingMilieux_MISCELLANEOUS
Abstract

Comets and asteroids, the small bodies of the Solar system, contain unique keys to understand the Early Solar System the posterior evolution of which is still poorly known. Our knowledge of the internal structure of comets and asteroids is, unfortunately, so far only indirect and is based on remote sensing observations of their surfaces and on theoretical modelling of their formation and evolution [1].

Published
2019
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2. Imaging the inner structure of a comet from few measurements in a bistatic scenario: case of a scale model

Author

J.-M. Geffrin, Alain Herique, Wlodek Kofman, Christelle Eyraud, HIPE (HIPE), Institut FRESNEL (FRESNEL), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Institut de Planétologie et d'Astrophysique de Grenoble (IPAG), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Centre National d'Études Spatiales [Toulouse] (CNES)-Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), and Eyraud, Christelle

Subjects
Physics, Bistatic radar, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, [SPI.ELEC] Engineering Sciences [physics]/Electromagnetism, Comet, [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], [SDU.ASTR.EP] Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], Astronomy, Scale model, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2018

3. Influence of the description of the scattering matrix on permittivity reconstruction with a quantitative imaging procedure: polarization effects

Author

Hassan Saleh, J.-M. Geffrin, Christelle Eyraud, Institut FRESNEL (FRESNEL), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Centre Commun de Ressources en Microondes (CCRM), HIPE (HIPE), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU)

Subjects
Permittivity, 02 engineering and technology, Iterative reconstruction, 01 natural sciences, Light scattering, 010309 optics, Optics, Optical coherence tomography, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, medicine, Circular polarization, ComputingMilieux_MISCELLANEOUS, Physics, medicine.diagnostic_test, business.industry, Scattering, Mathematical analysis, 020206 networking & telecommunications, Polarization (waves), Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Nonlinear system, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, Computer Vision and Pattern Recognition, business, [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing
Abstract

International audience; This paper focuses on the role of polarization-and more specifically, the effect of its selection-in 3D quantitative imaging obtained from scattered field measurements. Although polarization is now commonly used in linear imaging procedures (when unknowns are linked by a linear relationship to the measured signal), the influence of polarization choice is generally ignored in nonlinear imaging problems. In this paper, we propose a formulation to obtain the 3D permittivity map, by a nonlinear imaging procedure, from the scattering matrix. This allows one to select, from the same data set, the desired polarization case as input data for the imaging algorithm. We present a study of the influence of the input data polarization choice on the reconstructed per-mittivity map. This work shows that a suitable basis choice for the description of the scattering matrix and an appropriate selection of the element of this scattering matrix can greatly improve imaging results.

Published
2018
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4. Upgrading The Settings of a Microwave Experimental Setup for Better Accuracy in Bistatic Radar Cross Section Measurement

Author

Hassan Saleh, Hervé Tortel, J.-M. Geffrin, Christelle Eyraud, Centre Commun de Ressources en Microondes (CCRM), HIPE (HIPE), Institut FRESNEL (FRESNEL), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), and Eyraud, Christelle

Subjects
Background subtraction, Accuracy and precision, 010504 meteorology & atmospheric sciences, Noise measurement, Computer science, Acoustics, [SPI.ELEC] Engineering Sciences [physics]/Electromagnetism, 01 natural sciences, Signal, Bistatic radar, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, Signal-to-noise ratio, Noise control, Measurement uncertainty, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences
Abstract

Bistatic Radar Cross Section (RCS) measurement represents a particular challenge, compared to monostatic measurement. First, bistatic RCS measurement requires a background subtraction to compensate the direct incidence from the source to the receiver. Second, the measurement accuracy varies as function of the amplitude of the received signal which, by itself, varies as a function of the receiver’s position with respect to the source. In the forward scattering direction when the receiving and transmitting antennas are facing each other, the Signal to Noise Ratio (SNR) is usually satisfactory but the signal level must be maintained beyond the non-linear region of the receiving devices. However, in the backward scattering direction the SNR is quite low [1]. When measuring low RCS targets, these issues become very critical because the total field (measured with the presence of the target) and the incident field (background subtraction) become very similar, and the extraction of the RCS quantity from their subtraction becomes very vulnerable to the random noise. This problem has limited in the past the accurate measurement of low RCS targets, with dimensions smaller than the wavelength and/or with low relative permittivity, that may have RCS values down to −60 dBm2. Since the measurement setup of the CCRM was recently renewed, it became possible with the new apparatuses to apply a “smart” selection of the setup settings to enhance the measurement accuracy over all the bistatic range. In this study our goal is to evaluate the impact of the noise control, which can be obtained through the proposed setting adjustment, on the RCS measurement.

Published
2017

5. Optimization of the experimental parameters and of the noise of scattering measurements for inverse scattering applications

Author

H. Saleh, Christelle Eyraud, J.-M. Geffrin, Centre Commun de Ressources en Microondes (CCRM), HIPE (HIPE), Institut FRESNEL (FRESNEL), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), and Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Noise measurement, Measurement uncertainty, Bayesian probability, 02 engineering and technology, 01 natural sciences, Antenna measurements, 010309 optics, Scattering, symbols.namesake, Optics, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Power measurement, Physics, business.industry, Permittivity measurement, 020206 networking & telecommunications, Inversion (meteorology), [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, Gaussian noise, Inverse scattering problem, Permittivity, symbols, business, Algorithm
Abstract

International audience; This paper presents an attempt to optimize the technical settings of the experimental setup of the CCRM in Marseille in order to reduce the experimental noise and test its influence on inverse scattering reconstructions. This work has been done with the constraint of keeping a Gaussian noise distribution. The reconstructions, obtained from both simulation and measurements of the field scattered by the target under study, a spiral, were obtained with an inversion algorithm based on a Bayesian approach. Moreover, two different reconstructions from measurements are discussed here, with and without taking into account in the inversion algorithm the distribution of the noise affecting the measurements. Some preliminary conclusions are drawn.

Published
2017
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6. On the interest of a bistatic radar cross section setup to measure various scattering quantities

Author

Hassan Saleh, Christelle Eyraud, Amelie Litman, J.-M. Geffrin, HIPE (HIPE), Institut FRESNEL (FRESNEL), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), Centre Commun de Ressources en Microondes (CCRM), and Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Angular range, 010504 meteorology & atmospheric sciences, business.industry, Scattering, Extinction cross section, 020206 networking & telecommunications, 02 engineering and technology, Scale invariance, 01 natural sciences, symbols.namesake, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, Optics, Maxwell's equations, 0202 electrical engineering, electronic engineering, information engineering, symbols, Degree of polarization, business, Microwave, Bistatic radar cross section, 0105 earth and related environmental sciences
Abstract

International audience; This paper describes how the bistatic radar cross section (RCS) experimental setup of the “Centre Commun de Ressources en Microondes” (CCRM) was used to precisely determine various scattering quantities and how we took profit of the large scattering angular range available with this setup. Results on extinction cross section, linear degree of polarization and other scattering quantities of interest are presented. We also show how those results are interesting in different domains where scattering phenomena are studied thanks to the scale invariance properties of the Maxwell equations using the so called microwave analogy.

Published
2017
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7. Interlaboratory comparisons of radar cross section measurements by the 'GTi', criteria suggestions

Author

S. Leman, R. Guillerey, Pierre Massaloux, F. Daout, G-P Piau, J C Castelli, Christelle Eyraud, J.-M. Geffrin, S. Fargeot, Fabrice Comblet, G. Maze-Merceur, ONERA - The French Aerospace Lab [Palaiseau], ONERA-Université Paris Saclay (COmUE), Lab-STICC_ENSTAB_MOM_PIM, Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (Lab-STICC), Université européenne de Bretagne - European University of Brittany (UEB)-École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Télécom Bretagne-Institut Brestois du Numérique et des Mathématiques (IBNM), Université de Brest (UBO)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS)-Université européenne de Bretagne - European University of Brittany (UEB)-École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Télécom Bretagne-Institut Brestois du Numérique et des Mathématiques (IBNM), Université de Brest (UBO)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS), Systèmes et Applications des Technologies de l'Information et de l'Energie (SATIE), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École normale supérieure - Rennes (ENS Rennes)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Centre National de la Recherche Scientifique (CNRS), HIPE (HIPE), Institut FRESNEL (FRESNEL), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Airbus Defence and Space [Les Mureaux], ASTRIUM, DGA/CELAR, Nexio, Centre d'études scientifiques et techniques d'Aquitaine (CESTA), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Airbus Group Innovations [Suresnes], Airbus [France], GDR Ondes, École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Télécom Bretagne-Institut Brestois du Numérique et des Mathématiques (IBNM), Université de Brest (UBO)-Université européenne de Bretagne - European University of Brittany (UEB)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS)-École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Télécom Bretagne-Institut Brestois du Numérique et des Mathématiques (IBNM), Université de Brest (UBO)-Université européenne de Bretagne - European University of Brittany (UEB)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), Airbus Defence and Space, and Airbus Group

Subjects
Radar cross-section, Engineering, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, Anechoic chamber, business.industry, 0202 electrical engineering, electronic engineering, information engineering, Systems engineering, Electronic engineering, Measurement uncertainty, 020206 networking & telecommunications, 02 engineering and technology, business
Abstract

International audience; A comparison of Radar Cross Section (RCS) measurement results between several French measurement indoor facilities has been organized in the framework of a French Working Group (Groupe de Travail sur les incertitudes en chambre anéchoïque: GTi), dealing with measurement uncertainties in anechoic chamber. The GTi involves 22 laboratories that are either industrial or academic research ones, or laboratories depending on public organisms. Three tasks have been defined: 1/ State of the art, 2/ Comparisons of RCS measurements, 3/ Comparisons of Antenna Measurements. This paper deals with the second task, in which 8 laboratories are engaged. The motivations and the tasks are described in this paper and results will be presented at the conference. Comparison criteria will also be proposed.

Published
2017
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8. Influence of the uncertainties on the scattering problems

Author

Christelle Eyraud, J.-M. Geffrin, HIPE (HIPE), Institut FRESNEL (FRESNEL), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), and Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, Field (physics), microwave, Scattering, Electronic engineering, Measurement uncertainty, Electromagnetic wave scattering, Statistical physics, Focus (optics), uncertainty, Scattered field
Abstract

International audience; In this paper, our particular focus is on the uncertainties impact on scattered field measurements. These uncertainties can be due to a non perfect knowledge on the object parameters or to the measurement procedure itself. The influence of these uncertainties is of great importance when one want to perform comparisons between EM experimental fields and simulated fields.

Published
2014
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9. Imaging of a scaled comet model from lab experiments

Author

Christelle Eyraud, Wlodek Kofman, J.-M. Geffrin, Alain Herique, HIPE (HIPE), Institut FRESNEL (FRESNEL), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Institut de Planétologie et d'Astrophysique de Grenoble (IPAG), Centre National d'Études Spatiales [Toulouse] (CNES)-Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), Institut de Planétologie et d'Astrophysique de Grenoble (IPAG ), Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Observatoire des Sciences de l'Univers de Grenoble (OSUG), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, Microwave analogy, [SDU]Sciences of the Universe [physics], Comet, Reconstruction algorithm, Iterative reconstruction, Focus (optics), 3D Imaging, Remote sensing, Microwave tomography
Abstract

International audience; The main goal of CONSERT experiment is to reach information on the nucleus of the comet Churyumov-Gerasimenko/67P. In this contribution, we focus on microwave tomography and the study is conducted on an equivalent scaled model of the comet. A simple vectorial-induced current reconstruction algorithm is exploited to obtain qualitative maps of the scene. Imaging results of this test model have been performed from lab measurements.

Published
2014
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10. Plane Wave and Gaussian Beam Scattering by Long Dielectric Cylinders: 2.5D Simulations versus Measurements

Author

S. Van den Bulcke, Johan Stiens, J. M. Geffrin, Ann Franchois, L. Zhang, Dept. of Information Techn. (INTEC), Universiteit Gent = Ghent University [Belgium] (UGENT), Department of Electronics and Informatics (ETRO), Université de Bruxelles, HIPE (HIPE), Institut FRESNEL (FRESNEL), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), Idehara, Toshitaka, Electronics and Informatics, Laboratorium for Micro- and Photonelectronics, Universiteit Gent = Ghent University (UGENT), and Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Gaussian, Plane wave, Millimeter waves, 02 engineering and technology, 01 natural sciences, 2.5D simulations and measurements, 010309 optics, Scattering, symbols.namesake, Optics, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Classical electromagnetism, Vectorial Gaussian beam, Electrical and Electronic Engineering, Instrumentation, Physics, Radiation, business.industry, 020206 networking & telecommunications, Condensed Matter Physics, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, Extremely high frequency, symbols, Development (differential geometry), business, Microwave, Gaussian beam
Abstract

International audience; For the development of millimeter wave imaging systems, it is important to be able to simulate some representative scattering configurations. Typically, Gaussian beams are used in active imaging systems. Since these beams only illuminate a spatially limited region, many objects can be treated as infinitely long 2D (in)homogenous cylinders. However, the incident Gaussian beams have a 3D character. Therefore, a dedicated 2.5D scattering simulator was developed. In this paper, simulation results obtained with this simulator are compared to measurements obtained from a bi-static microwave set-up and from a W-band millimeter wave set-up. Comparison of simulations and measurements proves that the 2.5D algorithm is a good simulation tool to study scattering of long inhomogeneous cylinders, illuminated by 3D plane waves or 3D Gaussian beams under different elevation angles.

Published
2008
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