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Impact of temperature stabilization on the strapdown airborne gravimetry: a case study in Central Turkey / Mehmet Simav in Journal of geodesy, vol 94 n°4 (April 2020)  

Public [article]  inJournal of geodesy > vol 94 n°4 (April 2020) Titre : Impact of temperature stabilization on the strapdown airborne gravimetry: a case study in Central Turkey Type de document : Article/Communication Auteurs : Mehmet Simav, Auteur ; David Becker, Auteur ; Hasan Yildiz, Auteur ; Matthias Hoss, Auteur Année de publication : 2020 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] accéléromètre [Termes IGN] centrale inertielle à composants liés [Termes IGN] contrôle thermique [Termes IGN] étalonnage d'instrument [Termes IGN] filtre de Kalman [Termes IGN] gravimétrie aérienne [Termes IGN] réalité de terrain [Termes IGN] température [Termes IGN] Turquie Résumé : (auteur) Airborne gravimetry with strapdown inertial sensors has been a valuable tool for many years to fill in the gravity data gaps on the areas not accessible by land. Accuracies of 1 mGal level with off-the-shelf navigation-grade inertial measurement units (IMU) can only be achieved provided that the accelerometer drifts mainly caused by the temperature variations inside the IMU housing are separated from the gravity signal. Although there are several strategies proposed in the literature to deal with this inseparability problem, we use a thermal stabilization system (iTempStab) added on an iNAT-RQH navigation-grade IMU and investigate its performance over a test region in central Turkey with moderate topography and highly qualified ground truth gravity data. Two test flights were performed in 2017 and 2018 with and without iTempStab add-on following almost the same flight trajectories. During the first flight in 2017 with iNAT-RQH only, which lasted almost 5.5 h, there were considerable temperature variations inside the IMU housing from 39.1 to 46.0 °C. A simple thermal correction based on a laboratory calibration done before the flight was applied to the vertical Z-accelerometer in the pre-processing stage. However, temperature changes were within 0.1 °C during the second test flight in 2018 with TempStab add-on. The temperature stabilization gained by the iTempStab add-on produced better cross-over statistics. While the RMSE of the non-adjusted cross-over residuals was about 2.6 mGal, it reduced by 50% with iTempStab add-on. The adjusted cross-over differences of the 2018 flight yielded an RMSE of about 0.5 mGal, which is a remarkable precision for the strapdown gravimetry. The comparison with upward continued ground gravity data at flight altitudes suggests that the thermal stabilization system shows also remarkable improvements in the residual statistics. The range of the residuals decreases from ± 10 to ± 5 mGal, the standard deviation decreases from 2.19 to 0.94 mGal, and the RMSE decreases from 2.24 to 1.48 mGal, respectively, with the iTempStab add-on. It can be concluded that the thermal stabilization system significantly improves the accelerometer stability and therefore the precision and accuracy of the strapdown airborne gravity estimates. Numéro de notice : A2020-158 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-020-01369-5 Date de publication en ligne : 17/03/2020 En ligne : https://doi.org/10.1007/s00190-020-01369-5 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=94812 [article]

Simultaneous characterization of objects temperature and radiative properties through multispectral infrared thermography / Thibaud Toullier (2019)  

Public Titre : Simultaneous characterization of objects temperature and radiative properties through multispectral infrared thermography Titre original : Caractérisation conjointe de la température et des propriétés radiatives des objets par thermographie infrarouge multispectrale Type de document : Thèse/HDR Auteurs : Thibaud Toullier, Auteur ; Laurent Mevel, Directeur de thèse ; Jean Dumoulin, Directeur de thèse Editeur : Rennes : Université de Rennes 1 Année de publication : 2019 Importance : 233 p. Format : 21 x 30 cm Note générale : bibliographie Thèse de Doctorat Mathématique et Sciences et Technologies de l’Information et de la Communication, Spécialité Signal, Image, Vision, Université de Rennes 1 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] construction [Termes IGN] contrôle thermique [Termes IGN] données météorologiques [Termes IGN] données multicapteurs [Termes IGN] estimation bayesienne [Termes IGN] filtre de Kalman [Termes IGN] image multibande [Termes IGN] image thermique [Termes IGN] méthode de Monte-Carlo par chaînes de Markov [Termes IGN] Python (langage de programmation) [Termes IGN] rayonnement solaire [Termes IGN] scène 3D [Termes IGN] surveillance d'ouvrage [Termes IGN] thermographie Index. décimale : THESE Thèses et HDR Résumé : (auteur) The latest technological improvements in low-cost infrared cameras have brought new opportunities for long-term infrastructures monitoring. The accurate measurement of surfaces' temperatures is facing the lack of knowledge of radiatives properties of the scene. By using multi-sensors instrumentation, the measurement model can be refined to get a better estimate of the temperature. To overcome a lack of sensors instrumentation, it is shown that online and free available climatic data can be used. Then, Bayesian methods to estimate simultaneously the emissivity and temperature have been developed and compared to literature's methods. A radiative exchange simulator of 3D scenes have been developed to compare those different methods on numerical data. This software uses the hardware acceleration as well as a GPGPU approach to reduce the computation time. As a consequence, obtained numerical results emphasized an advanced use of multi-spectral infrared thermography for the monitoring of structures. This simultaneous estimation enables to have an estimate of the temperature by infrared thermography with a known uncertainty. Note de contenu : Introduction 1- Context and problem positioning 2- Bibliographical study 3- In-situ long-term thermal monitoring of structures: environmental measurements bias compensation 4- Study and development of an infrared multispectral images simulator 5- Proposed and studied methods for the simultaneous estimation of temperature and emissivity Conclusion and future work Numéro de notice : 25705 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse française Note de thèse : Thèse de Doctorat : Signal, Image, Vision : Rennes 1 : 2019 nature-HAL : Thèse DOI : sans En ligne : https://hal.science/tel-02389051 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=94850

Le Système Probatoire d'Observation de la Terre / Centre national d'études spatiales (1978)

Public Titre : Le Système Probatoire d'Observation de la Terre : caractéristiques principales Type de document : Monographie Auteurs : Centre national d'études spatiales, Auteur Editeur : Paris, Toulouse, Kourou [France] : Centre National d'Etudes Spatiales CNES Année de publication : 1978 Importance : 23 p. Format : 21 x 30 cm Langues : Français (fre) Descripteur : [Vedettes matières IGN] Satellites artificiels [Termes IGN] acquisition de données [Termes IGN] Ariane [Termes IGN] contrôle thermique [Termes IGN] HRV (capteur) [Termes IGN] image à haute résolution [Termes IGN] orbite [Termes IGN] plateforme [Termes IGN] secteur terrien [Termes IGN] spectre électromagnétique [Termes IGN] SPOT1 Note de contenu : Introduction Objectifs et conception du système SPOT Description du système SPOT Plan de développement du système SPOT Numéro de notice : 51261 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=59175

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
51261-01	21.20	Livre	Centre de documentation	Technologies spatiales	Disponible