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A low‐cost open‐source workflow to generate georeferenced 3D SfM photogrammetric models of rocky outcrops / Laurent Froideval in Photogrammetric record, vol 34 n° 168 (December 2019)  

Public [article]  inPhotogrammetric record > vol 34 n° 168 (December 2019) . - pp 365 - 384 Titre : A low‐cost open‐source workflow to generate georeferenced 3D SfM photogrammetric models of rocky outcrops Type de document : Article/Communication Auteurs : Laurent Froideval, Auteur ; Kevin Pedoja, Auteur ; Franck Garestier, Auteur ; et al., Auteur Année de publication : 2019 Article en page(s) : pp 365 - 384 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes descripteurs IGN] falaise [Termes descripteurs IGN] front rocheux [Termes descripteurs IGN] géoréférencement [Termes descripteurs IGN] GNSS en mode différentiel [Termes descripteurs IGN] image de drone [Termes descripteurs IGN] logiciel libre [Termes descripteurs IGN] modélisation 3D [Termes descripteurs IGN] Normandie (région 2016) [Termes descripteurs IGN] Open MVG [Termes descripteurs IGN] point d'appui [Termes descripteurs IGN] structure-from-motion Résumé : (auteur) Structure‐from‐Motion (SfM) software and unmanned aerial vehicles (UAVs) have been increasingly adopted in the geosciences. The current mainstream generation of 3D models is still expensive as it relies on UAVs, Differential Global Navigation Satellite System (DGNSS) ground control points and commercial software. This paper proposes an end‐to‐end reproducible SfM workflow with minimal legal, financial or field issues. The procedure avoids both UAVs and DGNSS and relies on open‐source software. Interlocked models of a rocky shore in Normandy, France were generated at different scales and point densities, being georeferenced using free spatial data. A spherical target was used for scaling and assessing the relative accuracy, which was better than 1 cm. Numéro de notice : A2019-576 Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/phor.12297 date de publication en ligne : 27/11/2019 En ligne : https://doi.org/10.1111/phor.12297 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=94459 [article]

Ionospheric and receiver DCB-constrained multi-GNSS single-frequency PPP integrated with MEMS inertial measurements / Zhouzheng Gao in Journal of geodesy, vol 91 n° 11 (November 2017)  

Public [article]  inJournal of geodesy > vol 91 n° 11 (November 2017) . - pp 1351 – 1366 Titre : Ionospheric and receiver DCB-constrained multi-GNSS single-frequency PPP integrated with MEMS inertial measurements Type de document : Article/Communication Auteurs : Zhouzheng Gao, Auteur ; Maorong Ge, Auteur ; Wenbin Shen, Auteur ; et al., Auteur Année de publication : 2017 Article en page(s) : pp 1351 – 1366 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes descripteurs IGN] coordonnées GNSS [Termes descripteurs IGN] erreur instrumentale [Termes descripteurs IGN] erreur systématique [Termes descripteurs IGN] filtre de Kalman [Termes descripteurs IGN] GNSS en mode différentiel [Termes descripteurs IGN] GPS-INS [Termes descripteurs IGN] intégration de données [Termes descripteurs IGN] perturbation ionosphérique [Termes descripteurs IGN] positionnement ponctuel précis [Termes descripteurs IGN] récepteur monofréquence [Termes descripteurs IGN] retard ionosphèrique Résumé : (Auteur) Single-frequency precise point positioning (SF-PPP) is a potential precise positioning technique due to the advantages of the high accuracy in positioning after convergence and the low cost in operation. However, there are still challenges limiting its applications at present, such as the long convergence time, the low reliability, and the poor satellite availability and continuity in kinematic applications. In recent years, the achievements in the dual-frequency PPP have confirmed that its performance can be significantly enhanced by employing the slant ionospheric delay and receiver differential code bias (DCB) constraint model, and the multi-constellation Global Navigation Satellite Systems (GNSS) data. Accordingly, we introduce the slant ionospheric delay and receiver DCB constraint model, and the multi-GNSS data in SF-PPP modular together. In order to further overcome the drawbacks of SF-PPP in terms of reliability, continuity, and accuracy in the signal easily blocking environments, the inertial measurements are also adopted in this paper. Finally, we form a new approach to tightly integrate the multi-GNSS single-frequency observations and inertial measurements together to ameliorate the performance of the ionospheric delay and receiver DCB-constrained SF-PPP. In such model, the inter-system bias between each two GNSS systems, the inter-frequency bias between each two GLONASS frequencies, the hardware errors of the inertial sensors, the slant ionospheric delays of each user-satellite pair, and the receiver DCB are estimated together with other parameters in a unique Kalman filter. To demonstrate its performance, the multi-GNSS and low-cost inertial data from a land-borne experiment are analyzed. The results indicate that visible positioning improvements in terms of accuracy, continuity, and reliability can be achieved in both open-sky and complex conditions while using the proposed model in this study compared to the conventional GPS SF-PPP. Numéro de notice : A2017-706 Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-017-1029-7 En ligne : https://doi.org/10.1007/s00190-017-1029-7 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=88087 [article]

GNSS / Scott Gleason (2009)

Public Titre : GNSS : applications and methods Type de document : Monographie Auteurs : Scott Gleason, Editeur scientifique ; Demoz Gebre-Egziabher, Editeur scientifique Editeur : Londres, Washington : Artech House Année de publication : 2009 Collection : GNSS Technology and applications series Importance : 508 p. Format : 18 x 26 cm - cont. 1 DVD ISBN/ISSN/EAN : 978-1-59693-329-3 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes descripteurs IGN] BeiDou [Termes descripteurs IGN] centrale inertielle [Termes descripteurs IGN] détection du signal [Termes descripteurs IGN] Galileo [Termes descripteurs IGN] géodésie spatiale [Termes descripteurs IGN] Global Navigation Satellite System [Termes descripteurs IGN] Global Positioning System [Termes descripteurs IGN] GNSS assisté pour la navigation [Termes descripteurs IGN] GNSS en mode différentiel [Termes descripteurs IGN] GPS-INS [Termes descripteurs IGN] interférence [Termes descripteurs IGN] logiciel de post-traitement GPS [Termes descripteurs IGN] LORAN (système) [Termes descripteurs IGN] navigation aérienne [Termes descripteurs IGN] navigation inertielle [Termes descripteurs IGN] navigation spatiale [Termes descripteurs IGN] occultation du signal [Termes descripteurs IGN] positionnement différentiel [Termes descripteurs IGN] positionnement en intérieur [Termes descripteurs IGN] positionnement par GNSS [Termes descripteurs IGN] poursuite de satellite [Termes descripteurs IGN] radiofréquence [Termes descripteurs IGN] récepteur GPS [Termes descripteurs IGN] signal GNSS [Termes descripteurs IGN] simulation [Termes descripteurs IGN] système de numérisation mobile [Termes descripteurs IGN] traitement du signal [Termes descripteurs IGN] transmission de données Résumé : (Editeur) Over the past few years, the growth of GNSS applications has been staggering. And, this trend promises to continue in the foreseeable future. Placing emphasis on applications development, this unique resource offers a highly practical overview of GNSS (global navigation satellite systems), including GPS. The applications presented in the book range from the traditional location applications to combining GNSS with other sensors and systems and into more exotic areas, such as remote sensing and space weather monitoring. Written by leading experts in the field, this book presents the fundamental underpinnings of GNSS and provides you with detailed examples of various GNSS applications. Moreover, the software included with the book contains valuable processing tools and real GPS data sets to help you rapidly advance your own work in the field. You will find critical information and tools that help give you a head start to embark on future research and development projects. Note de contenu : - Introduction. - GNSS Signal Acquisition and Tracking. - Position, Velocity and Time Estimation. - Differential GNSS: Accuracy and Integrity. - A GPS Software Receiver. - Integration of GNSS and INS. - GNS/INS Case Studies. - Integrated LADAR, INS and GNSS Navigation. - Combining GNSS with RF Systems. - Aviation Applications. - Integrated GNSS and Loran Systems. - Indoor and Weak Signal Navigation. - Space Applications. - Geodesy and Surveying. - Atmospheric Sensing Using GNSS. - Remote Sensing Using Bistatic GNSS Reflections. - Epilogue. - New Navigation Signals and Future Systems in Evolution. Numéro de notice : 20459 Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63026

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