Centre dedocumentation
scientifique

Street smart: 3-D city mapping and modeling for positioning with multi-GNSS / Li-Ta Hsu in GPS world, vol 26 n° 7 (July 2015)  

Public [article]  inGPS world > vol 26 n° 7 (July 2015) . - pp 36 - 43 Titre : Street smart: 3-D city mapping and modeling for positioning with multi-GNSS Type de document : Article/Communication Auteurs : Li-Ta Hsu, Auteur ; Shunsuke Miura, Auteur ; Shunsuke Kamijo, Auteur Année de publication : 2015 Article en page(s) : pp 36 - 43 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes descripteurs IGN] canyon urbain [Termes descripteurs IGN] coordonnées géographiques [Termes descripteurs IGN] GNSS assisté pour la navigation [Termes descripteurs IGN] modèle géométrique du bâti [Termes descripteurs IGN] navigation pédestre [Termes descripteurs IGN] positionnement par GNSS [Termes descripteurs IGN] Quasi-Zenith Satellite System [Termes descripteurs IGN] récepteur monofréquence [Termes descripteurs IGN] réflexion spéculaire [Termes descripteurs IGN] signal GLONASS [Termes descripteurs IGN] signal GPS [Termes descripteurs IGN] traitement du signal [Termes descripteurs IGN] trajet multiple Résumé : (Auteur) A particle-filter positioning method using a 3D map to rectify the errors created by multipath and non-line-of-sight signals on the positioning result delivered by a low-cost single-frequency GPS receiver takes a multi-GNSS approach, using the combined signals of GPS, GLONASS and QZSS. The method outperforms conventional positioning in availablility and positioning accuracy. It wil likely fused with other sensors in a future pedestrian navigation application. Numéro de notice : A2015-308 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article En ligne : http://gpsworld.com/street-smart-3d-city-mapping-and-modeling-for-positioning-wi [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76532 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
067-2015071	SL	Revue	Centre de documentation	Revues en salle	Disponible

Galileo E1 and E5a Performance for multi-frequency, multi-constellation GBAS / Mihaela-Simona Circiu in GPS world, vol 26 n° 4 (April 2015)  

Public [article]  inGPS world > vol 26 n° 4 (April 2015) . - pp 30 - 35 Titre : Galileo E1 and E5a Performance for multi-frequency, multi-constellation GBAS Type de document : Article/Communication Auteurs : Mihaela-Simona Circiu, Auteur ; Michael Felux, Auteur ; Sam Pullen, Auteur Année de publication : 2015 Article en page(s) : pp 30 - 35 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes descripteurs IGN] analyse comparative [Termes descripteurs IGN] antenne Galileo [Termes descripteurs IGN] antenne GPS [Termes descripteurs IGN] performance [Termes descripteurs IGN] rapport signal sur bruit [Termes descripteurs IGN] signal Galileo [Termes descripteurs IGN] signal GPS [Termes descripteurs IGN] station permanente [Termes descripteurs IGN] système d'extension [Termes descripteurs IGN] traitement du signal [Termes descripteurs IGN] trajet multiple Résumé : (auteur) Analysis of new Galileo signals at an experimental ground-based augmentation system (GBAS) compares noise and multipath in their performance to GPS L1 and L5. Raw noise and multipath level of the Galileo signals is shown to be smaller than those of GPS. Even after smoothing, Galileo signals perform somewhat better than GPS and are less sensitive to the smoothing time constant. Numéro de notice : A2015-091 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article En ligne : http://gpsworld.com/galileo-e1-and-e5a-performance-for-multi-frequency-multi-con [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75587 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
067-2015041	SL	Revue	Centre de documentation	Revues en salle	Disponible

Generating statistically robust multipath stacking maps using congruent cells / Thomas Fuhrmann in GPS solutions, vol 19 n° 1 (January 2015)  

Public [article]  inGPS solutions > vol 19 n° 1 (January 2015) . - pp 83 - 92 Titre : Generating statistically robust multipath stacking maps using congruent cells Type de document : Article/Communication Auteurs : Thomas Fuhrmann, Auteur ; Xiaoguang Luo, Auteur ; Andreas Knöpfler, Auteur ; Michael Mayer, Auteur Année de publication : 2015 Article en page(s) : pp 83 - 92 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes descripteurs IGN] cellule [Termes descripteurs IGN] congruence [Termes descripteurs IGN] correction du trajet multiple [Termes descripteurs IGN] résidu [Termes descripteurs IGN] superposition [Termes descripteurs IGN] trajet multiple [Termes descripteurs IGN] valeur aberrante Résumé : (auteur) Multipath effects caused by reflections in the near-field and far-field of a GNSS antenna represent a major error source in static and kinematic GNSS positioning applications. Since these effects are strongly site-specific, a generally valid and practicable analytical multipath model is still lacking. In contrast, using GNSS carrier phase observation residuals, the multipath stacking (MPS) methods are able to take site-specific conditions into account. We propose an advanced approach to performing residual-based MPS in the space domain. Being superior to most conventional attempts in which stacking cells have a fixed azimuthal resolution, our suggested method makes use of congruent cells and rigorous statistical assessments in terms of outlier detection and significance evaluation of the stacked values. The advanced stacking approach is applied to representative phase residuals from static precise point positioning. The results show that the use of congruent cells allows for MPS at high elevation angles and with a fine spatial resolution. Applying the resulting MPS maps at the residual level, both near-field and far-field effects at high and low elevation angles, respectively, can be significantly mitigated. In comparison with the conventional approach, the advanced one enables a larger reduction of about 20 % in the SD of residuals. Numéro de notice : A2015-205 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1007/s10291-014-0367-7 date de publication en ligne : 23/02/2014 En ligne : https://doi.org/10.1007/s10291-014-0367-7 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76018 [article]

The carrier-multipath observable: a new carrier-phase multipath mitigation technique / Ramin Moradi in GPS solutions, vol 19 n° 1 (January 2015)  

Public [article]  inGPS solutions > vol 19 n° 1 (January 2015) . - pp 73 - 82 Titre : The carrier-multipath observable: a new carrier-phase multipath mitigation technique Type de document : Article/Communication Auteurs : Ramin Moradi, Auteur ; Wolfgang Schuster, Auteur ; Shaojun Feng, Auteur ; et al., Auteur Année de publication : 2015 Article en page(s) : pp 73 - 82 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes descripteurs IGN] correction du trajet multiple [Termes descripteurs IGN] trajet multiple Résumé : (auteur) Modeling and mitigating carrier-phase multipath errors continue to be a significant challenge for high-accuracy positioning using global navigation satellite systems. The multipath error is dependent on the operational environment and therefore cannot be mitigated by differencing techniques. The effect of multipath is accentuated when observables based on linear combinations of measurements from two or more frequencies are formulated. We develop a new carrier-phase multipath error observable that isolates the inter-frequency carrier-phase multipath error for linear combinations of observables, such as wide-lane (WL). Real-time kinematic positioning results from varying baseline lengths show that a significant reduction in between 14 and 47 % in the time to initial ambiguity resolution are achieved by correcting the WL observable using the new carrier-phase multipath error observable. Numéro de notice : A2015-204 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1007/s10291-014-0366-8 date de publication en ligne : 22/01/2014 En ligne : https://doi.org/10.1007/s10291-014-0366-8 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76017 [article]

Korrektur stationsabhängiger Fehler bei GNSS / Andreas Knöpfler (2015) 

Public Titre : Korrektur stationsabhängiger Fehler bei GNSS Type de document : Thèse/HDR Auteurs : Andreas Knöpfler, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2015 Collection : DGK - C, ISSN 0065-5325 num. 744 Importance : 177 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-5156-0 Note générale : bibliographie akademisches Grades eines Doktor-Ingenieurs von der Fakultüt für Bauingenieur-, Geo- und Umweltwissenschaften des Karlsruher Instituts für Technologie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes descripteurs IGN] antenne GNSS [Termes descripteurs IGN] centre de phase [Termes descripteurs IGN] erreur systématique [Termes descripteurs IGN] étalonnage d'instrument [Termes descripteurs IGN] modèle d'erreur [Termes descripteurs IGN] positionnement ponctuel précis [Termes descripteurs IGN] positionnement statique [Termes descripteurs IGN] résidu [Termes descripteurs IGN] traitement de données GNSS [Termes descripteurs IGN] trajet multiple Mots-clés libres : stacking map Index. décimale : 30.60 Géodésie spatiale Résumé : (auteur) Highly precise positioning techniques based on Global Navigation Satellite Systems (GNSS) have become a standard tool for numerous disciplines, benefitting from the continuous development of receiver equipment and the appearance of additional GNSS. In addition to the classical differential processing approach, the Precise Point Positioning (PPP) method is able to derive station coordinates with the same accuracy as a baseline setup, when sufficient observation time is available. The basis for PPP is the improved quality of external products for the GNSS data processing, for example the orbit and especially the satellite clock products of the International GNSS Service (IGS) and its analysis centers. The increased usage of GNSS comes along with higher demands on accuracy. Therefore, the modelling of important error sources in GNSS is continuously upgraded. Intensive research led to a refinement of both the functional and the stochastic model in GNSS data processing in order to enable the correction of specific error components, for example the antenna behaviour or the tropospheric delay. Despite of the improvements in GNSS modelling, multipath effects still remain as a main error source in highly precise GNSS positioning. Within this work, stacking techniques are used to correct for multipath effects and further site dependent errors, for example residual errors in the calibration values of the receiving GNSS antenna. The method developed in this work is based on zero difference PPP residuals, which are accumulated over defined azimuth-elevation cells and over a fixed period of time (here: 10 d) and introduced as correction (so-called stacking maps) in a second PPP processing run. The main purpose of this approach aims for the improvement of data, recorded on continuously operating reference stations. Within this work, two scenarios for the implementation of the corrections were investigated in detail: the combination of the stacking maps joined with the calibration information of the GNSS receiving antennas and in contrast to this approach the separate modelling of both aspects in a separate file. In order to check the effectivity of this method, the results (e.g., coordinates, residuals) before and after the introduction of the stacking maps were intensively analyzed. Within the second scenario (introduction of the correction in a separate file), the behaviour of the stacking maps over time was investigated by the analysis of so-called sliding stacking maps. Sliding stacking maps are generated as follows: calculation of a first stacking map from the residuals for example for day of year (DoY) 121 to 130 and introduction as correction for DoY 131, the next stacking map is computed from the residuals for DoY 122 to 131 and introduced for DoY 132 and so on. Especially sites with poor data quality show a significant improvement of the residual values after the implementation of stacked information. Furthermore, observations remain in the used data set, whereas they were eliminated in the processing without the introduction of stacking maps. In addition, the necessity of expensive, site-dependent individual antenna calibration was checked. The focus was on the compensating level of the stacking approach with respect to unmodelled antenna effects based on the replacement of individual receiving antenna calibrations by type mean values of the IGS in combination with stacking maps. Therefore, data of selected sites were processed using both the existing individual antenna calibration sets and the IGS type mean values. In a second processing run, the calibration sets were introduced taking the corresponding stacking information into account. Differences in the phase center variations of the antennas can be corrected by the stacking maps. Discrepancies due to differences in the phase center offsets remain in the estimated site coordinates. Numéro de notice : 14920 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Note de thèse : PhD : Géodésie : Karlsruhes Institut für Technologie : 2015 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76931

Documents numériques

en open access 14920 Korrektur stationsabhängiger Fehler bei GNSS Adobe Acrobat PDF

Limnimétrie par réflectométrie GNSS à faible coût / Eduardo Rodrigues in XYZ, n° 139 (juin - août 2014)

Permalink

Localisation de véhicule par satellites couplée à la navigation à l'estime et aux données cartographiques / David Bétaille (2014)  

Permalink

Hunting for GNSS echoes: analysis of signal tracking techniques for multipath mitigation / Antonio Fernandez in GPS world, vol 24 n° 11 (November 2013)

Permalink

Urban positioning on a smartphone: real-time shadow matching using GNSS and 3D city models / Lei Wang in Inside GNSS, vol 8 n° 6 (November - December 2013) 

Permalink

Time-reversal-based multipath mitigation technique for ISAR images / Imanol Arriba-Ruiz in IEEE Transactions on geoscience and remote sensing, vol 51 n° 5 Tome 2 (May 2013)  

Permalink

Evaluation et surveillance des effets du multi-trajets dans les stations GNSS permanentes / Loïc Grondin (2013) 

Permalink

GPS snow depth meter with geometry-free linear combinations of carrier phases / M. Ozeki in Journal of geodesy, vol 86 n° 3 (March 2012)  

Permalink

Système de positionnement intérieur basé sur des répéteurs de signaux GPS / T. Coupin (2012) 

Permalink

Multipath minimization method: mitigation through adaptive filtering for machine automation applications / L. Serrano in GPS world, vol 22 n° 7 (July 2011)

Permalink

Coherent integration time limits for mobile GNSS receivers in multipath fading environments / Ali Broumandan in Inside GNSS, vol 6 n° 2 (March - April 2011)    

Permalink