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Estimating the yaw-attitude of an BDS IGSO and MEO satellites / Xiaolei Dai in Journal of geodesy, vol 89 n° 10 (october 2015)
[article]
Titre : Estimating the yaw-attitude of an BDS IGSO and MEO satellites Type de document : Article/Communication Auteurs : Xiaolei Dai, Auteur ; Maorong Ge, Auteur ; Yidong Lou, Auteur ; et al., Auteur Année de publication : 2015 Article en page(s) : pp 1005-1018 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Techniques orbitales
[Termes IGN] constellation BeiDou
[Termes IGN] instabilité du vecteur (télédétection)
[Termes IGN] lacet
[Termes IGN] orbitographie
[Termes IGN] orientation du capteur
[Termes IGN] positionnement par BeiDou
[Termes IGN] positionnement ponctuel précisRésumé : (auteur) Precise knowledge and consistent modeling of the yaw-attitude of GNSS satellites are essential for high-precision data processing and applications. As the exact attitude control mechanism for the satellites of the BeiDou Satellite Navigation System (BDS) is not yet released, the reverse kinematic precise point positioning (PPP) method was applied in our study. However, we confirm that the recent precise orbit determination (POD) processing for GPS satellites could not provide suitable products for estimating BDS attitude using the reverse PPP because of the special attitude control switching between the nominal and the orbit-normal mode. In our study, we propose a modified processing schema for studying the attitude behavior of the BDS satellites. In this approach, the observations of the satellites during and after attitude switch are excluded in the POD processing, so that the estimates, which are needed in the reverse PPP, are not contaminated by the inaccurate initial attitude mode. The modified process is validated by experimental data sets and the attitude yaw-angles of the BDS IGSO and MEO satellites are estimated with an accuracy of better than 9∘. Furthermore, the results confirm that the switch is executed when the Sun elevation is about 4∘ and the actual orientation is very close to its target one. Based on the estimated yaw-angles, a preliminary attitude switch model was established and reintroduced into the POD, yielding to a substantial improvement in the orbit overlap RMS. Numéro de notice : A2015-880 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-015-0829-x En ligne : https://doi.org/10.1007/s00190-015-0829-x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79412
in Journal of geodesy > vol 89 n° 10 (october 2015) . - pp 1005-1018[article]From GPS and virtual globes to spatial computing - 2020 / Shashi Shekhar in Geoinformatica, vol 19 n° 4 (October - December 2015)
[article]
Titre : From GPS and virtual globes to spatial computing - 2020 Type de document : Article/Communication Auteurs : Shashi Shekhar, Auteur ; Steven Feiner, Auteur ; Walid G. Aref, Auteur Année de publication : 2015 Article en page(s) : pp 799 - 832 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique
[Termes IGN] données localisées
[Termes IGN] évolution technologique
[Termes IGN] géovisualisation
[Termes IGN] information géographique numérique
[Termes IGN] navigation
[Termes IGN] positionnement par GPS
[Termes IGN] prospectiveRésumé : (auteur) Spatial computing is a set of ideas, solutions, tools, technologies, and systems that transform our lives with a new prospect of understanding, navigating, visualizing and using locations. In this community whitepaper, we present a perspective on the changing world of spatial computing, research challenges and opportunities and geoprivacy issues for spatial computing. First, this paper provides an overview of the changing world of spatial computing. Next, promising technologies that resulted from the integration of spatial computing in the everyday lives of people is discussed. This integration results with promising technologies, research challenges and opportunities and geoprivacy issues that must be addressed to achieve the potential of spatial computing. Numéro de notice : A2015--036 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1007/s10707-015-0235-9 En ligne : http://dx.doi.org/10.1007/s10707-015-0235-9 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81122
in Geoinformatica > vol 19 n° 4 (October - December 2015) . - pp 799 - 832[article]Instantaneous ambiguity resolution for URTK and its seamless transition with PPP-AR / Xuan Zou in GPS solutions, vol 19 n° 4 (october 2015)
[article]
Titre : Instantaneous ambiguity resolution for URTK and its seamless transition with PPP-AR Type de document : Article/Communication Auteurs : Xuan Zou, Auteur ; Weiming Tang, Auteur ; Chuang Shi, Auteur ; Jingnan Liu, Auteur Année de publication : 2015 Article en page(s) : pp 559 - 567 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] positionnement cinématique en temps réel
[Termes IGN] positionnement ponctuel précis
[Termes IGN] résolution d'ambiguïté
[Termes IGN] système d'extension
[Termes IGN] véhicule automobileRésumé : (auteur) We extend the current Undifferenced network RTK (URTK) approaches by additionally using P1/CA augmentation information from reference stations. P1/CA augmentation information can shorten the convergence time and help to fix the ionosphere-free combination ambiguities in several epochs. Instantaneous and centimeter-level positioning solutions can be achieved for rovers within the coverage of regional reference network. Also, we develop an approach for seamless transition between URTK and precise point positioning with ambiguity resolution (PPP-AR) and present a new scheme to provide URTK service. Therefore, a service for a large number of rovers can be easily realized in real-time data communication for ambiguity fixing. In addition, the period when augmentation information from a particular reference station is not available can be bridged with the help of PPP-AR. Rovers can experience more operational time with fewer interruptions, which are difficult tasks for current URTK and Network Real-Time Kinematic services. More importantly, with this new scheme, URTK and PPP-AR services can be integrated into a unique PPP-AR system. The obtained convergence time only depends on whether or not the rover is receiving the regional augmentation information. Numéro de notice : A2015-465 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1007/s10291-014-0411-7 Date de publication en ligne : 14/10/2014 En ligne : https://doi.org/10.1007/s10291-014-0411-7 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=77152
in GPS solutions > vol 19 n° 4 (october 2015) . - pp 559 - 567[article]Multiangle BSAR imaging based on BeiDou-2 navigation satellite system: experiments and preliminary results / Tao Zeng in IEEE Transactions on geoscience and remote sensing, vol 53 n° 10 (October 2015)
[article]
Titre : Multiangle BSAR imaging based on BeiDou-2 navigation satellite system: experiments and preliminary results Type de document : Article/Communication Auteurs : Tao Zeng, Auteur ; Dongyang Ao, Auteur ; Cheng Hu, Auteur ; et al., Auteur Année de publication : 2015 Article en page(s) : pp 5760 - 5773 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] acquisition d'images
[Termes IGN] fusion d'images
[Termes IGN] image radar moirée
[Termes IGN] positionnement par BeiDou
[Termes IGN] positionnement par GNSS
[Termes IGN] radar bistatique
[Termes IGN] zone d'intérêtRésumé : (Auteur) This paper analyzes the multiangle imaging results for bistatic synthetic aperture radar (BSAR) based on global navigation satellite systems (GNSS-BSAR). Due to the shortcoming of GNSS-BSAR images, a multiangle observation and data processing strategy based on BeiDou-2 navigation satellites was put forward to improve the quality of images and the value of system application. Twenty-six BSAR experiments were conducted and analyzed in different configurations. Furthermore, a region-based fusion algorithm using region-of-interest (ROI) segmentation was proposed to generate a high-quality fusion image. Based on the fusion image, typical targets such as water area, vegetation area, and artificial targets were compared and interpreted among single/multiple-angle images. The results reveal that the multiangle imaging method was a good technique to enhance image information, which might extend the applications of GNSS-BSAR. Numéro de notice : A2015-754 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2015.2430312 Date de publication en ligne : 26/05/2015 En ligne : https://doi.org/10.1109/TGRS.2015.2430312 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=78744
in IEEE Transactions on geoscience and remote sensing > vol 53 n° 10 (October 2015) . - pp 5760 - 5773[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 065-2015101 SL Revue Centre de documentation Revues en salle Disponible SELF: Semantically Enriched Line simpliFication / Emmanuel Stefanakis in International journal of geographical information science IJGIS, vol 29 n° 10 (October 2015)
[article]
Titre : SELF: Semantically Enriched Line simpliFication Type de document : Article/Communication Auteurs : Emmanuel Stefanakis, Auteur Année de publication : 2015 Article en page(s) : pp 1826 - 1844 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] attribut sémantique
[Termes IGN] extension temporelle
[Termes IGN] généralisation cartographique automatisée
[Termes IGN] polyligne
[Termes IGN] représentation cartographique
[Termes IGN] simplification de contour
[Termes IGN] système d'extension spatialRésumé : (Auteur) Linear features are represented on paper or digital maps with polyline geometries. Sampling, discretization, and generalization processes result in polylines of a length smaller than that of the actual features. In addition, semantics associated to the original line features may be lost. This becomes more significant for coarse sampling and/or high degree of generalization. This paper introduces a data structure that can alleviate this problem, by preserving the attributes and semantic characteristics associated to the original features in cartographic representation. The structure can handle both linear features and polygon outlines. Various compression methods have been examined. The structure has been implemented and tested with both synthetic and real datasets. Extensions to spatiotemporal features, like trajectories, have also been considered. Numéro de notice : A2015-611 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2015.1053092 En ligne : https://doi.org/10.1080/13658816.2015.1053092 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=78041
in International journal of geographical information science IJGIS > vol 29 n° 10 (October 2015) . - pp 1826 - 1844[article]Tightly coupled integration of GPS precise point positioning and MEMS-based inertial systems / Mahmoud Abd Rabbou in GPS solutions, vol 19 n° 4 (october 2015)PermalinkGalileo en route vers le GNSS / Bernard Bonhoure in XYZ, n° 144 (septembre - novembre 2015)PermalinkGetting There by Tuning In: Using HD Radio Signals for Navigation / Ananta Vidyarthi in GPS world, vol 26 n° 9 (September 2015)PermalinkSimulating the effects of quasar structure on parameters from geodetic VLBI / Stanislav S. Shabala in Journal of geodesy, vol 89 n° 9 (september 2015)PermalinkSnow depth estimation based on multipath phase combination of GPS triple-frequency signals / Kegen Yu in IEEE Transactions on geoscience and remote sensing, vol 53 n° 9 (September 2015)PermalinkTowards the production of digital terrain models from volunteered GPS trajectories / I. Massad in Survey review, vol 47 n° 344 (September 2015)PermalinkImpacts of real-time satellite clock errors on GPS precise point positioning-based troposphere zenith delay estimation / Junbo Shi in Journal of geodesy, vol 89 n° 8 (August 2015)PermalinkThe status of measurement of the Mediterranean mean dynamic topography by geodetic techniques / Philip L. Woodworth in Journal of geodesy, vol 89 n° 8 (August 2015)PermalinkA worldwide ionospheric model for fast precise point positioning / Adria Rovira-Garcia in IEEE Transactions on geoscience and remote sensing, vol 53 n° 8 (August 2015)PermalinkGBAS ionospheric threat model assessment for category I operation in the Korean region / Minchan Kim in GPS solutions, vol 19 n° 3 (July 2015)Permalink