Descripteur
Termes IGN > sciences naturelles > physique > électronique > composant électronique
composant électronique |
Documents disponibles dans cette catégorie (191)
Ajouter le résultat dans votre panier
Visionner les documents numériques
Affiner la recherche Interroger des sources externes
Etendre la recherche sur niveau(x) vers le bas
Du photon au pixel / Henri Maître (2015)
Titre : Du photon au pixel : l'appareil photographique numérique Type de document : Guide/Manuel Auteurs : Henri Maître, Auteur Editeur : Londres : ISTE Editions Année de publication : 2015 Collection : Traitement du signal et de l'image Importance : 433 p. Format : 15 x 23 cm ISBN/ISSN/EAN : 978-1-78405-090-0 Note générale : Bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] bruit (théorie du signal)
[Termes IGN] détecteur
[Termes IGN] format d'image
[Termes IGN] image en couleur
[Termes IGN] image numérique
[Termes IGN] logiciel
[Termes IGN] objectif photographique
[Termes IGN] photométrie
[Termes IGN] photon
[Termes IGN] pixel
[Termes IGN] qualité d'image
[Termes IGN] radiométrieIndex. décimale : 35.10 Acquisition d'images Résumé : (Editeur) L'appareil photographique numérique cache des innovations technologiques remarquables qui concernent la formation de l'image, la représentation des couleurs ou l'automatisation des mesures et des réglages. Ce livre décrit l'appareil aussi bien du point de vue de la physique des phénomènes mis en jeu, que de la technique des composants et des logiciels qu'il emploie. S'appuyant sur les propriétés perceptuelles du système visuel ainsi que sur les standards de transmission et de représentation, il analyse les solutions proposées pour répondre aux demandes du photographe concernant la mise au point, le contraste, la balance des blancs ou la stabilisation de l'image. Les architectures avancées adoptées dans les téléphones mobiles et les développements de la photographie computationnelle sont également présentés, préfigurant les fonctionnalités de l'appareil futur. Note de contenu :
1. Premier contact
2. L’objectif photographique
3. Le capteur numérique
4. Radiométrie et photométrie
5. La couleur
6. Qualité d’image
7. Le bruit dans la photographie numérique
8. La représentation des images : codage et formats
9. Autour du capteur photographique
10. Photographie et logicielsNuméro de notice : 22524 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Manuel de cours Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81500 Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 22524-01 35.10 Livre Centre de documentation En réserve M-103 Disponible Atmospheric water vapour sensing by means of differential absorption spectrometry using solar and lunar radiation / Stefan Walter Münch (2014)
Titre : Atmospheric water vapour sensing by means of differential absorption spectrometry using solar and lunar radiation Type de document : Thèse/HDR Auteurs : Stefan Walter Münch, Auteur Editeur : Zurich : Schweizerischen Geodatischen Kommission / Commission Géodésique Suisse Année de publication : 2014 Collection : Geodätisch-Geophysikalische Arbeiten in der Schweiz, ISSN 0257-1722 num. 92 Importance : 210 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-908440-35-2 Note générale : bibliographie, thèse publiée
Diss., Eidgenössische Technische Hochschule ETH Zürich, Nr. 21491, 2013Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Atmosphère
[Termes IGN] correction troposphérique
[Termes IGN] détecteur à transfert de charge
[Termes IGN] pouvoir de résolution spectrale
[Termes IGN] rayonnement solaire
[Termes IGN] spectromètre
[Termes IGN] spectrométrie
[Termes IGN] teneur en vapeur d'eau
[Termes IGN] troposphèreIndex. décimale : 47.50 Atmosphère Résumé : (auteur) Tropospheric water vapour plays a crucial role in the understanding of a variety of different atmospheric processes, ranging from local weather phenomena to global climate change. Regarding satellite geodesy, water vapour acts as disturbing factor for various measurement methods, causing path delays of radio signals and consequently leads to considerable biases in the measurement results. The spatial and temporal concentration distribution can hardly be modelled and therefore has to be determined instrumentally to correct the influence computationally. The application of the principle of “Differential Optical Absorption Spectroscopy” (DOAS) using the sun as radiation source to locally determine integrated water vapour concentrations (PW), has proven itself as a very potent methodology, with good relative and absolute accuracy, high temporal resolution and comparably low calibration efforts. It also seems especially well suited for validation purposes for independent measurement methods.
The intention of the presented project is to implement the findings from the development of earlier prototype instruments and to contemplate several further aspects related with the DOAS approach to determine atmospheric water vapour: Improved temporal coverage of the measurement method through inclusion of night time measurements with the help of moonlight, which are enabled by means of a massively increased system sensitivity to deal with the up to six orders of magnitude lower intensity of the background radiation with respect to solar measurements. Further it is to investigate, how reliable acquisitions of sun transmission spectra can be achieved, when deploying the system on moving platforms, for possible future validation measurements of satellite-borne radiometer data on satellite ground tracks on the open sea. The prototype instruments developed should particularly feature high field versatility, requiring eased transportability, resistance to weather and not least the possibility of a fully automatic measurement procedure, including instrument self-calibration.
For this purpose two identically constructed compact measurement systems were built. The instruments dispose of a custom-built telescope (heliostat principle) and an optically directly coupled spectrometer unit. The whole system is enclosed in a rugged aluminium hull, including most of the steering electronics. The motorized telescope is able to follow the moving light source fully autonomously, also with the platform moderately moving. A quasi-monochromator with an echelle grating as main dispersion element is used as spectrometer unit, allowing a compact architecture, a great spectral resolution and efficiency at the same time. Together with a back-thinned CCD detector highly resolved images of water vapour absorption lines can be obtained. The primary wavelength range lies between 789 nm and 802 nm, the reciprocal linear dispersion amounts to 7.3 pm/px at a focal length of just 400 mm. A motorized deflection mirror in the spectrometer allows the observation of adjacent spectral windows and serves for the highly precise position stabilization of the spectrum on the CCD sensor.
Test measurements with the sun and the moon as background radiation source show the extraordinarily high system light throughput and the high spectral resolving power of the apparatus. However illumination dependent interference structures on the detector (etaloning) prevent the deduction of usable transmission spectra from the measured raw data. For that reason a variety of optical measures to homogenize the radiation entering the spectrometer with respect to field and aperture are examined. As a feasible solution, with sufficient radiation distribution and a still acceptable intensity attenuation, a short quartz light guiding fibre with a hexagonal cross section has been found and implemented.
For instrumental control a software package has been developed, which autonomously handles the measurement process including the various calibration processes and the interaction of the various sensors and actuators. Additionally a variety of algorithms have been provided, helping to eliminate various defective influences in the raw data, as the correction of stray and false light portions or the elimination of interspersed beat structures in lunar spectra. Furthermore procedures which serve in spectrum processing have been supplied, as for the computation of a holistic intensity baseline or the dynamic determination of apparatus profiles. For the determination of the water vapour concentrations from the measured spectroscopic data established computational procedures could be used mostly.
Various available spectroscopic databases have been analysed regarding the suitability of the listed absorption line parameters for the deduction of reliable water vapour concentrations. Comparison between the two identically built solar spectrometers yield considerable deviations of up to 1.5 kg/m 2 in the zenith integral concentrations which are presumably ascribable to systematic influences likely caused by unrecognized stray light influence. The mean value of the stochastic deviations amounts to about 1.1 % of the slant PW concentration. The cross-comparison with an independent measurement method, in this case GPS meteorology, however also shows significant divergences and thus point to the various further systematic effects which have to be examined more closely, as e.g. the uncertainty of the published spectroscopic parameters regarding line strength and line broadening as well as the baseline determination in the measured spectra.
Despite the considerable sensitivity losses with respect to the originally planned design due to beam homogenization, the methodology has been successfully applied to lunar measurements, albeit with reduced accuracy as stated in stochastic appraisals and with considerably lower temporal resolution.
The project presented here confirms and clarifies the possibilities of the application of DOAS for ground- based remote sensing of integral water vapour concentrations, but also gives clear indication on the different systematic biases which have to be examined more closely, e.g. regarding the accuracy of the spectroscopic parameters (both, for line strength and line broadening), as well as the determination procedure of the baseline in the measured spectra. This work also points out the chances as well as the serious difficulties which arise from the design, construction and deployment of highly integrated DOAS spectrometers of high performance. Regarding the application of various optical components and detectors for the development of similar instruments valuable insights have been gathered.Numéro de notice : 14913 Affiliation des auteurs : non IGN Autre URL associée : URL ETH Zurich Thématique : POSITIONNEMENT Nature : Thèse étrangère Note de thèse : PhD : Sciences : ETH Zurich : 2013 DOI : 10.3929/ethz-a-010006561 En ligne : http://e-collection.library.ethz.ch/view/eth:7591 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76813 Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 14913-01 47.50 Livre Centre de documentation En réserve M-103 Disponible Integrated navigation: GPS/BeiDou/INS performance in two hemispheres / Yong Li in Inside GNSS, vol 8 n° 6 (November - December 2013)
[article]
Titre : Integrated navigation: GPS/BeiDou/INS performance in two hemispheres Type de document : Article/Communication Auteurs : Yong Li, Auteur ; Gang Sun, Auteur ; Wei Jiang, Auteur Année de publication : 2013 Article en page(s) : 7 p. ; pp 57 - 63 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] Australie
[Termes IGN] centrale inertielle
[Termes IGN] Chine
[Termes IGN] GPS-INS
[Termes IGN] microsystème électromécanique
[Termes IGN] positionnement par BeiDou
[Termes IGN] positionnement par GNSS
[Termes IGN] positionnement par GPS
[Termes IGN] temps réelRésumé : (Auteur) Rapid development of the BeiDou satellite navigation system over the past decade has made the new GNSS ready for evaluation of its capabilities. This article describes a serie of road trials in China and Australia using a new multi-sensor integrated navigation system that fuses GPS, BeiDou and MEMS inertial sensors. Preliminary test results indicate that this integrated system can continuously provide navigation solutions in all the test environments, using inertial measurements to bridge GNSS outages. An analysis of various distributions of satellites in the constellations reveal the influence of the two GNSS systems' satellite geometry on real-time positioning. Numéro de notice : A2013-727 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32863
in Inside GNSS > vol 8 n° 6 (November - December 2013) . - 7 p. ; pp 57 - 63[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 159-2013061 SL Revue Centre de documentation Revues en salle Disponible Documents numériques
en open access
a2013-727_integrated_navigation_li.pdfAdobe Acrobat PDF Provenance capture and use in a satellite data processing pipeline / Scott Jensen in IEEE Transactions on geoscience and remote sensing, vol 51 n° 11 (November 2013)
[article]
Titre : Provenance capture and use in a satellite data processing pipeline Type de document : Article/Communication Auteurs : Scott Jensen, Auteur ; Beth Plale, Auteur ; et al., Auteur Année de publication : 2013 Article en page(s) : pp 5090 - 5097 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] acquisition d'images
[Termes IGN] acquisition de données
[Termes IGN] architecture pipeline (processeur)
[Termes IGN] image Aqua-AMSR
[Termes IGN] source de données
[Termes IGN] télédétection en hyperfréquenceRésumé : (Auteur) With the interdependencies that exist between data in a scientific processing pipeline, the ability to track the provenance of the scientific process through multiple stages is necessary to determining the usability of the resulting data product. In this paper, we study the capture of provenance from an existing NASA instrument ingest pipeline. Since instrumenting the scientific code for a production system is not feasible, we show how provenance events can be scavenged from log files to generate detailed provenance graphs. Through extensions to the Karma provenance system, which have been implemented on a test instance of the AMSR-E production data pipeline, we determine that when the volume of provenance information is high, provenance graph visualizations provide a good tool for monitoring the ingest pipeline and identifying processing differences in ways not seen before. Two novel uses of provenance that we present in this paper are comparisons between processing runs and forward provenance for viewing downstream dependencies. Numéro de notice : A2013-611 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2013.2266929 En ligne : https://doi.org/10.1109/TGRS.2013.2266929 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32747
in IEEE Transactions on geoscience and remote sensing > vol 51 n° 11 (November 2013) . - pp 5090 - 5097[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 065-2013111 RAB Revue Centre de documentation En réserve L003 Disponible Getting closer to everywhere: accurately tracking smartphones indoors / Ramsey Faragher in GPS world, vol 24 n° 10 (October 2013)
[article]
Titre : Getting closer to everywhere: accurately tracking smartphones indoors Type de document : Article/Communication Auteurs : Ramsey Faragher, Auteur ; Robert Harle, Auteur Année de publication : 2013 Article en page(s) : pp 43 - 49 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] accéléromètre
[Termes IGN] apprentissage automatique
[Termes IGN] gyroscope
[Termes IGN] magnétomètre
[Termes IGN] microsystème électromécanique
[Termes IGN] navigation à l'estime
[Termes IGN] navigation pédestre
[Termes IGN] odomètre
[Termes IGN] positionnement en intérieur
[Termes IGN] téléphone intelligentRésumé : (Editeur) [...] What are we to do if we wish to obtain consistently usable positions indoors using a mobile phone? As we will see in this month's column, we can augment or bypass its GPS or GNSS receiver with other unfettered sensing technologies such as gyroscopes and accelerometers. These devices can be made very small using microelectromechanical technology and are already included in some mobile phones. However, there are some issues with these devices for positioning, not the least of which is rapid position drift. We can restrain the drift by using magnetometers, for example - also present in some mobile phones. We can also use radio signals of opportunity to help in the positioning - signals available in the phone such as multi-generation mobile signals, Bluetooth, and Wi-Fi through their signal strength "fingerprints." But is all of this actually feasible? The authors of the article in this month's column have conducted tests of such a multi-system approach to positioning indoors with quite favorable results. Are we at the stage of accurate positioning (and tracking) everywhere? Not quite, but we are getting closer. Numéro de notice : A2013-586 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32722
in GPS world > vol 24 n° 10 (October 2013) . - pp 43 - 49[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 067-2013101 RAB Revue Centre de documentation En réserve L003 Disponible Out-of-core GPU-based change detection in massive 3D point clouds / Rico Richter in Transactions in GIS, vol 17 n° 5 (October 2013)PermalinkGNSS test standards for cellular location / Peter Anderson in GPS world, vol 24 n° 5 (May 2013)PermalinkSpatio-temporal image pattern prediction method based on a physical model with time-varying optical flow / Hidetomo Sakaino in IEEE Transactions on geoscience and remote sensing, vol 51 n° 5 Tome 2 (May 2013)PermalinkOne billion points in the cloud – an octree for efficient processing of 3D laser scans / Jan Elseberg in ISPRS Journal of photogrammetry and remote sensing, vol 76 (February 2013)PermalinkAnalyse fonctionnelle du futur système de repositionnement pour les fermetures de l'expérience ATLAS / Mehdi Daakir (2013)PermalinkL'électronique en pratique / Charles Platt (2013)PermalinkIntroduction to a portable stereo mapping system for unmanned vehicles / Julien Li-Chee-Ming in Geomatica, vol 66 n° 4 (December 2012)PermalinkImproving GNSS attitude determination using inertial and magnetic field sensors / J. Roth in Inside GNSS, vol 7 n° 5 (September - October 2012)PermalinkVisualisation 3D de terrain texturé : préservation au niveau du pixel des qualités géométriques et colorimétriques, une méthode temps réel, innovante et simple / T.V. Lê in Revue internationale de géomatique, vol 22 n° 3 (septembre - novembre 2012)PermalinkEin modulares Simulationskonzept zur Evaluierung von Positionssensoren sowie Filter- und Regelalgorithmen am Beispiel des automatisierten Strassenbaus / A. Beetz (2012)PermalinkGNSS inside mobile phones: GPS, GLONASS, QZSS and SBAS in a single chip / Franck Van Diggelen in Inside GNSS, vol 6 n° 2 (March - April 2011)PermalinkPermalinkAviation grade : New GPS signals, chips off the block IIF / R.E. Phelts in Inside GNSS, vol 5 n° 5 (July - August 2010)PermalinkTesting multi-GNSS equipment: systems, simulators and the production pyramid [part 1] / I. Petrovski in Inside GNSS, vol 5 n° 5 (July - August 2010)PermalinkArchitecture for a future C-band/L-band GNSS mission : Part 2 signal considerations and related user terminal aspects / José Avila-Rodriguez in Inside GNSS, vol 4 n° 4 (July - August 2009)PermalinkProcesseurs multicoeurs et parallélisme (Seconde partie) / Anonyme in Géomatique expert, n° 69 (juin - juillet 2009)PermalinkProcesseurs multicoeurs et parallélisme (Première partie) / Anonyme in Géomatique expert, n° 67 (01/02/2009)PermalinkCounting equivalent correlators: quantifying the number for GNSS acquisition engine architectures / A. Genghi in GPS world, vol 20 n° 1 (January 2009)PermalinkSensor modelling and validation for linear array aerial and satellite imagery / Sultan Aksakal Kocaman (2009)PermalinkEvaluation du modèle d'erreur de capteurs MEMS-IMU / J.M. Bonnaz in XYZ, n° 117 (décembre 2008 - février 2009)Permalink