Academic literature on the topic 'Synthèse d’ouverture'
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Journal articles on the topic "Synthèse d’ouverture":
Beaucoudrey, Nicole de, and Grégoire Mercier. "Compression de données brutes et d’images de radar à synthèse d’ouverture." Annales Des Télécommunications 56, no. 11-12 (November 2001): 646–54. http://dx.doi.org/10.1007/bf02995558.
Khaldoune, Jalal, Monique Bernier, Eric van Bochove, and Michel C. Nolin. "Détection du gel et non-gel du sol en utilisant le radar polarimétrique à synthèse d’ouverture." Canadian Journal of Remote Sensing 34, no. 4 (January 2008): 418–29. http://dx.doi.org/10.5589/m08-031.
Duteurtre, Guillaume. "Commerce et développement de l’élevage laitier en Afrique de l’Ouest : une synthèse." Revue d’élevage et de médecine vétérinaire des pays tropicaux 60, no. 1-4 (January 1, 2007): 209. http://dx.doi.org/10.19182/remvt.9972.
Merzouki, A., A. Bannari, P. M. Teillet, and D. J. King. "Caractérisation géostatistique de la variabilité spatiale de l’humidité du sol à l’aide des cartes dérivées des données radar à synthèse d’ouverture de RADARSAT-1." Canadian Journal of Remote Sensing 34, no. 4 (January 2008): 376–89. http://dx.doi.org/10.5589/m08-033.
GLAUDE, Quentin, and Anne ORBAN. "Missions actuelles en télédétection par radar à synthèse d’ouverture, et applications." Bulletin de la Société Géographique de Liège, 2022. http://dx.doi.org/10.25518/0770-7576.6626.
DETHINNE, Thomas, Quentin GLAUDE, Charles AMORY, Christoph KITTEL, and Xavier FETTWEIS. "COMPARAISON ENTRE LA FONTE DE SURFACE ESTIMÉE PAR LE RADAR À SYNTHÈSE D’OUVERTURE SENTINEL-1 ET UN MODÈLE CLIMATIQUE RÉGIONAL. CAS D’ÉTUDE SUR LA PLATEFORME DE GLACE DU ROI BAUDOUIN, EN ANTARCTIQUE DE L’EST." Bulletin de la Société Géographique de Liège, 2022. http://dx.doi.org/10.25518/0770-7576.6644.
Meucci, Simone. "A EXPERIÊNCIA DOCENTE DE GILBERTO FREYRE NA ESCOLA NORMAL DE PERNAMBUCO (1929-1930)." Caderno CRH 18, no. 44 (August 30, 2006). http://dx.doi.org/10.9771/ccrh.v18i44.18520.
Dissertations / Theses on the topic "Synthèse d’ouverture":
Nicolet, Frank. "Emissions codées simultanées en synthèse d’ouverture pour l’imagerie ultrasonore." Electronic Thesis or Diss., Lyon, INSA, 2023. http://www.theses.fr/2023ISAL0079.
In its conventional form, focused ultrasound imaging, the image rate is limited to a few dozen images per second. Over the past two decades, ultrasound imaging has undergone a revolution with the advent of so-called ultrafast imaging, enabling imaging at a rate of several thousand images per second. This increase in image rate has enabled the emergence of new imaging modes such as functional or parametric imaging, offering clinicians new diagnostic tools. However, all ultrafast ultrasound imaging methods suffer from a trade-off between frame rate and image quality. In this context, the main objective of this thesis is to develop ultrasound image acquisition and reconstruction methods that optimize image frame rate without degrading quality. To achieve this, coded emissions derived from telecommunications and RADAR imaging are used. The main focus of this thesis concerns increasing the frame rate of ultrasound imaging using synthetic aperture processing (STA). Classically, this imaging method achieves high image quality but suffers from low frame rates. The principle developed in this thesis consists in simultaneously activating several transmitters by applying spatio-temporal encoding to them. Using this method, we demonstrate that a gain in frame rate of a factor of 5 can be achieved during experimental acquisitions, without any degradation in image quality. A second theme investigated in this thesis involves increasing the frame rate of plane-wave imaging (PWI) by simultaneously transmitting several coded plane waves. A direct model is described and used to solve the associated inverse problem in order to reconstruct the imaged medium. We show that this method can be used to simultaneously improve image rate and quality during experimental acquisitions. Translated with www.DeepL.com/Translator (free version)
Danilo, Céline. "Évaluation des courants de surface océanique au moyen d’un radar à ouverture synthétique." Brest, 2009. http://www.theses.fr/2009BRES2023.
The aim of this thesis is to extract the radar line-of-sight component of sea surface current from the Doppler shift of a signal received by a synthetic aperture radar on board of ENVISAT. The primary goals of this work are the separation of waves and surface current components to this Doppler shift and, furthermore, the expansion of this analysis to multiple angles of incidence, thereby making it possible to map sea surface currents. This study is limited to vertical polarization and to the radar frequency hand C. Extraction of current signature is based on the assumption that the Doppler shift is caused solely by surface gravity waves and by surface current. Moreover, we initially assume that the current is uniform within the surface of Doppler shift estimation. Under these assumptions, the current component can be deduced from the Doppler shift by substracting the wave component. The latter have relatively short wavelengths, which is typical of wind-sea. Practical use of 10 m wind information for the estimation of waves component is evaluated. A method for extracting surface current information is developed and tested, initially for a constant incidence angle of 23°, on small-sized and isolated ocean images from all over the oceans. A comparison of the monthly average speeds, obtained by on-site current measurements, indicates an RMS error of 0. 35 m/s. As a further step, the same methodology is applied for larger acquisitions (400 km by 400 km minimum) for which the incidence angle ranges from 16 to 42°, This new configuration requires a preliminary analysis of the effect of incidence angle variation on the Doppler shift. We show that an increase of the angle of incidence results in the increase of the relative component of surface current to the Doppler shift, and that the latter also varies according to the direction of wind with respect to the direction of the radar. The estimated surface current component shows a good quantitative correspondence with the same component measured by on-site sensors. This result is encouraging in view of the development of a more systematic technique. Finally, the last part of this work is devoted to a more complex case, namely that of coastal current: here, the hypothesis of a uniform surface current within the estimation surface cannot be maintained anymore due to the great variability of these currents. In this case, we proceed by analyzing maps of Doppler shift of a 1 km resolution. Despite the complexity of this situation, once again, the comparison between Doppler shift-derived velocities and data from tidal current maps indicates a strong potential of SAR images to return high resolution information on surface currents
Pham, Ha Thai. "Analyse de "Time Lapse" optiques stéréo et d'images radar satellitaires : application à la mesure du déplacement de glaciers." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAA004/document.
Earth observation by image acquisition systems allows the survey of temporal evolution of natural phenomena such as earthquakes, volcanoes or gravitational movements. Various techniques exist including satellite imagery, terrestrial photogrammetry and in-situ measurements. Image time series from automatic cameras (Time Lapse) are a growing source of information since they offer an interesting compromise in terms of spatial coverage and observation frequency in order to measure surface motion in specific areas. This PhD thesis is devoted to the analysis of image time series from terrestrial photography and satellite radar imagery to measure the displacement of Alpine glaciers. We are particularly interested in Time Lapse stereo processing problems for monitoring geophysical objects in unfavorable conditions for photogrammetry. We propose a single-camera processing chain that includes the steps of automatic photograph selection, coregistration and calculation of two-dimensional (2D) displacement field. The information provided by the stereo pairs is then processed using the MICMAC software to reconstruct the relief and get the three-dimensional (3D) displacement. Several pairs of synthetic aperture radar (SAR) images were also processed with the EFIDIR tools to obtain 2D displacement fields in the radar geometry in ascending or descending orbits. The combination of measurements obtained almost simultaneously on these two types of orbits allows the reconstruction of the 3D displacement. These methods have been implemented on time series of stereo pairs acquired by two automatic cameras installed on the right bank of the Argentière glacier and on TerraSAR-X satellite images covering the Mont-Blanc massif. The results are presented on data acquired during a multi-instrument experiment conducted in collaboration with the French Geographic National Institute (IGN) during the fall of 2013,with a network of Géocubes which provided GPS measurements. They are used to evaluate the accuracy of the results obtained by proximal and remote sensing on this type of glacier
Ledo, Gonçalves Ramos Fernanda. "Apport de l'interférométrie radar satellitaire pour le suivi des évolutions environnementales en Amazonie, Brésil." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-01069825.
El, Moussawi Ibrahim. "Synthetic Aperture Radar : Algorithms and Applications in Forests and Urban Areas." Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTG078.
The objective of this thesis is to exploit Multi-baseline Synthetic Aperture Radar (SAR) for studying the remote sensing of natural scenarios, such as forest structure characterization and land subsidence monitoring. In the case of forested areas, tropical forest structure parameters are derived by Tomography SAR (TomoSAR) technique. For urban areas, Land subsidence is investigated through Interferometry SAR (InSAR) techniques. TomoSAR and InSAR will be treated by using Multi-baseline SAR images over different sites. Prior to tomographic analysis, a phase calibration algorithm is needed to compensate for phase residuals that corrupt the data and influence the focusing of Multi-baseline data. First, a tomographic study has carried out in tropical forest, where the forest characterization was assessed by using SAR tomography at L and P-band. Second, different InSAR techniques have been compared with respect to their performance in monitoring earth’s surface deformation, taking Lebanon as a case study.The first part of the thesis presents the TomoSAR analysis in the tropical forest. A review of phase calibration techniques employed on TomoSAR data is shown. The problem formulation starts with the phase calibration of the data stack that is considered as the main gate to begin with SAR processing algorithms. Thus, the main phase calibration algorithms proposed in the literature are discussed. Two of the most important phase calibration approaches are then described and discussed in detail. The potential of L-band TomoSAR data to characterize tropical forest structure is evaluated. The challenge here is the short wavelength of L-band data, and whether can penetrate tropical forests down to the ground. Tomographic analysis is carried out using L-band UAVSAR data from the AfriSAR campaign conducted over Gabon Lopé Park in February 2016. It was found that L-band TomoSAR was able to penetrate into and through the canopy down to the ground, and thus the canopy and ground layers were detected correctly. Then, monitoring tropical forest structure using SAR tomography at L- and P-band are treated. For this, a comparison of the P- and L-band TomoSAR profiles, Land Vegetation and Ice Sensor (LVIS), and discrete return LiDAR is provided in order to assess the ability for TomoSAR to monitoring and estimating the tropical forest structure parameters for enhanced forest management and to support biomass missions. The L- and P-band's performances for canopy penetration are assessed to determine the underlying ground locations. Additionally, the 3D records for each configuration are compared regarding their ability to derive forest vertical structure.The second part of the thesis tackle the utilization of InSAR techniques in land subsidence monitoring. The idea is to split the estimation of earth's surface deformations into two steps. The first step is to use Maximum Likelihood technique to jointly process Permanent scaterrers and Distributed scaterrers in order to yield the best estimates of interferometric phases. Then, the second step is to separate the contributions to the interferometric phases due to the scene topography and deformation field from those caused by decorrelation noise and atmospheric disturbances. As a case study, an extensive InSAR analysis of Lebanon site is shown, relying on a data-set of 117 Sentinel-1 satellite data acquired over Lebanon between 2015 and 2019, with high temporal resolution (i.e. 6 days)
Lobry, Sylvain. "Modèles Markoviens pour les images SAR : application à la détection de l'eau dans les images satellitaires SWOT et analyse multi-temporelle de zones urbaines." Electronic Thesis or Diss., Paris, ENST, 2017. http://www.theses.fr/2017ENST0056.
To obtain a better coverage both spatially and temporally, hydrologists use spaceborne data in addition to data acquired in situ. Resulting from a collaboration between NASA’s Jet Propulsion Laboratory (JPL) and the French Space Agency (CNES), the upcoming SWOT mission will provide global continental water elevation measures using Synthetic Aperture Radar (SAR) interferometry. In this dissertation, we address the problem of water detection in SWOT amplitude images, which is to be performed before the interferometric processing. To this end, we propose to use a method dedicated to the detection of large water bodies and a specific algorithm for the detection of narrow rivers. The first method is based on Markov Random Fields (MRF). The classification is regularized and the class parameters, which cannot be assumed constant in the case of SWOT, are jointly estimated. The second method is based on segment detection at the pixel level, completed by a connection step. To study the extension to multi-temporal data, we propose methods adapted to the processing of series of SAR images of urban areas. These areas feature strong scatterers, having a radiometry orders of magnitude higher than the other points in the image. The proposed models explicitly account for the presence of these strong scatterers by considering the images as a sum of two components (the background and the strong scatterers). Different regularization terms can then be applied to each of these components. Modeled as MRF, they can then be optimized exactly using graph cuts. We present applications for strong scatterers detection, regularization and change detection
Kpre, Ettien lazare. "Contribution à l’étude de techniques de codage analogique pour l’imagerie microonde active et passive." Thesis, Limoges, 2017. http://www.theses.fr/2017LIMO0060/document.
Microwave imaging systems are currently attracting great attention in the field of research, especially for security applications (body scanners, vision through walls, etc.). Several acquisition techniques already exist to optimize the antenna aperture in order to guarantee a good resolution on the final image. However, the current lock of imaging systems is to be able to achieve a real-time acquisition and address numerous antennas. Most of the current systems struggle to reconcile fast imaging and resolution while ensuring good sensitivity. The work carried out in this manuscript aims at proposing an alternative to the existing systems based on analog coding techniques of the antenna signals. Overall, the goal is to minimize the number of receivers without affecting performances. The proposed architectures are based essentially on the concept of the MIMO radar (for active systems) and the Synthetic Aperture Interferometric Radiometer or SAIR (for passive systems). These two systems allow a significant reduction of the number of antennas without affecting the resolution of the image, thus enabling a first lifting of constraints. In addition, passive compressive components are used to reduce the number of receivers in the MIMO Radar and the SAIR systems. These components with spatial and frequency diversity exhibit orthogonal transfer functions. Used in transmission, they allow simultaneous and independent addressing of each element of the antenna array. In reception, they allow the signals received by the antennas to be coded into a considerably reduced number of aggregate waveforms. By applying suitable decoding techniques, the signals received by each antenna can be estimated in order to apply imaging algorithms. These components offer the advantage of greatly reducing the number of RF channels while keeping the same number of antennas and allowing simultaneous acquisition of the signals. Laboratory demonstrators were carried out in S-band to demonstrate the feasibility of the proposed alternatives. Finally, the results obtained were the subject of a patent application and a prototype of a millimeter-wave radiometric imager is being developed in the framework of the ANR-PIXEL project
Farage, Grégory. "Filtrage multiéchelle et turbo filtrage d’images polarimétriques." Thèse, Université de Sherbrooke, 2015. http://hdl.handle.net/11143/6748.
Martin-Lac, Victor. "Aerial navigation based on SAR imaging and reference geospatial data." Electronic Thesis or Diss., Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2024. http://www.theses.fr/2024IMTA0400.
We seek the algorithmic means of determining the kinematic state of an aerial device from an observation SAR image and reference geospatial data that may be SAR, optical or vector. We determine a transform that relates the observation and reference coordinates and whose parameters are the kinematic state. We follow three approaches. The first one is based on detecting and matching structures such as contours. We propose an iterative closest point algorithm and demonstrate how it can serve to estimate the full kinematic state. We then propose a complete pipeline that includes a learned multimodal contour detector. The second approach is based on a multimodal similarity metric, which is the means of measuring the likelihood that two local patches of geospatial data represent the same geographic point. We determine the kinematic state under the hypothesis of which the SAR image is most similar to the reference geospatial data. The third approach is based on scene coordinates regression. We predict the geographic coordinates of random image patches and infer the kinematic state from these predicted correspondences. However, in this approach, we do not address the fact that the modality of the observation and the reference are different
Ait, Assou Manal. "Synthetic aperture imaging and spectroscopy in the terahertz range using time domain spectroscopy system." Electronic Thesis or Diss., Limoges, 2024. https://aurore.unilim.fr/theses/nxfile/default/437c1676-13e9-4b65-9ff5-95b93ac02ca3/blobholder:0/2024LIMO0008.pdf.
Les techniques d'imagerie et de spectroscopie térahertz offrent de vastes applications dans le control non destructif ou le contrôle de qualité dans la manufacture industrielle, la pharmaceutique et la biologie, l'archéologie ou encore le monde de l’art. Pour ces applications, la technique de spectroscopie térahertz dans le domaine temporel (THz-TDS) permet une analyse sur une bande passante instantanée très large (0.1-6 THz), mais nécessite généralement de déplacer mécaniquement l’échantillon à imager dans le plan focal du faisceau THz. Le travail de cette thèse porte sur l’adaptation d’un banc THz-TDS pour l’imagerie et la spectroscopie des échantillons fixes, en se basant sur le principe d’un radar à synthèse d’ouverture (SAR), en transmission. En utilisant cette technique, on démontre une reconstruction d'image en 3D avec une résolution inférieure au millimètre de plusieurs échantillons différents. Pour remédier au temps d'acquisition prolongés, un échantillonnage spatial lacunaire est proposé, réduisant les éléments du réseau synthétique et améliorant la vitesse d'acquisition. De plus, les données reconstruites ne sont pas uniquement utilisées pour l'imagerie mais permettent également la caractérisation des paramètres optiques matériaux (l'indice de réfraction et le coefficient d'absorption) constituant l'objet imagé dans la bande de fréquence de reconstruction. Ainsi, la technique proposée permet la cartographie spectrale 2D de l'indice de réfraction à diverses fréquences térahertz. Enfin, la méthodologie proposée est appliquée à l'imagerie de sortie de guide d'ondes térahertz, illustrant sa grande flexibilité et ses vastes domaine potentielles d’utilisation
Book chapters on the topic "Synthèse d’ouverture":
Poccardi, Grégoire, and Giorgos M. Sanidas. "Éléments de synthèse et d’ouverture." In Le feu dans la cité antique, 133–38. Presses universitaires du Septentrion, 2022. http://dx.doi.org/10.4000/books.septentrion.132045.
Perrin-Glorian, Marie-Jeanne. "Éléments de synthèse et d’ouverture." In Les méthodes de recherche en didactiques, 205–8. Presses universitaires du Septentrion, 2006. http://dx.doi.org/10.4000/books.septentrion.14909.
Ghersetti, Antonella. "En guise d’ouverture." In Authors as Readers in the Mamlūk Period and Beyond. Venice: Fondazione Università Ca’ Foscari, 2022. http://dx.doi.org/10.30687/978-88-6969-560-5/001.
"Chapitre 7 De l’interféromètre de Labeyrie à la synthèse d’ouverture optique." In Mieux voir les étoiles, 157–94. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-2406-9-009.
"Chapitre 7 De l’interféromètre de Labeyrie à la synthèse d’ouverture optique." In Mieux voir les étoiles, 157–94. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-2406-9.c009.
THOMPSON, M. Diane, Goze Bertin BÉNIÉ, and Robert V. Dams. "Cartographie de la forêt et de l’occupation du sol en milieu tropical par radar à synthèse d’ouverture." In Télédétection de l'environnement dans l'espace francophone, 163–80. Presses de l'Université du Québec, 2011. http://dx.doi.org/10.2307/j.ctv18pgwp2.19.