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Reduction of PPP convergence period through pseudorange multipath and noise mitigation / Garrett Seepersad in GPS solutions, vol 19 n° 3 (July 2015)
[article]
Titre : Reduction of PPP convergence period through pseudorange multipath and noise mitigation Type de document : Article/Communication Auteurs : Garrett Seepersad, Auteur ; Sunil Bisnath, Auteur Année de publication : 2015 Article en page(s) : pp 369 - 379 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] bruit atmosphérique
[Termes IGN] correction du trajet multiple
[Termes IGN] filtrage du bruit
[Termes IGN] mesurage de pseudo-distance
[Termes IGN] positionnement ponctuel précis
[Termes IGN] trajet multipleRésumé : (auteur) Pseudorange multipath and pseudorange noise are the largest remaining unmanaged error sources in PPP. It is proposed that by reducing the effects of multipath and noise on the pseudorange observable, accurate estimates of carrier phase float ambiguities will be attained sooner, thus reducing the initial convergence period of PPP. Given the problem, this study seeks to improve mitigation of the pseudorange errors. The well-known multipath linear combination is used in two distinct ways: (1) to directly correct the raw pseudorange observables and (2) to stochastically de-weight the pseudorange observables. The improvements in the solution were calculated with respect to the conventional GPS PPP float solution, where the raw pseudorange observables were not modified or stochastically de-weighted. Corrections to the observables were made using the multipath linear combination from data obtained from the previous and same day. Minimal improvements were noted using the multipath observable from the previous day. Using the multipath observable from the same day was possible in real-time and post-processing modes, showing an improvement in the rate of convergence for 48 and 57 % of the data, respectively. An improvement in the rate of convergence for 34 % of the data was observed when the pseudorange measurements were stochastically de-weighted using the multipath observable. Datasets with no improvements from directly correcting the raw pseudorange observables (43 %) or stochastically de-weighting the pseudorange observables (66 %) presented similar quality of results as the conventional PPP solution. Numéro de notice : A2015-461 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1007/s10291-014-03 Date de publication en ligne : 01/08/2014 En ligne : https://doi.org/10.1007/s10291-014-0395-3 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=77136
in GPS solutions > vol 19 n° 3 (July 2015) . - pp 369 - 379[article]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)
[article]
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 IGN] canyon urbain
[Termes IGN] coordonnées géographiques
[Termes IGN] GNSS assisté pour la navigation
[Termes IGN] modèle géométrique du bâti
[Termes IGN] navigation pédestre
[Termes IGN] positionnement par GNSS
[Termes IGN] Quasi-Zenith Satellite System
[Termes IGN] récepteur monofréquence
[Termes IGN] réflexion spéculaire
[Termes IGN] signal GLONASS
[Termes IGN] signal GPS
[Termes IGN] traitement du signal
[Termes IGN] trajet multipleRésumé : (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 DOI : sans 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
in GPS world > vol 26 n° 7 (July 2015) . - pp 36 - 43[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-2015071 RAB Revue Centre de documentation En réserve L003 Disponible Galileo E1 and E5a Performance for multi-frequency, multi-constellation GBAS / Mihaela-Simona Circiu in GPS world, vol 26 n° 4 (April 2015)
[article]
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 IGN] analyse comparative
[Termes IGN] antenne Galileo
[Termes IGN] antenne GPS
[Termes IGN] performance
[Termes IGN] rapport signal sur bruit
[Termes IGN] signal Galileo
[Termes IGN] signal GPS
[Termes IGN] station permanente
[Termes IGN] système d'extension
[Termes IGN] traitement du signal
[Termes IGN] trajet multipleRésumé : (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 DOI : sans 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
in GPS world > vol 26 n° 4 (April 2015) . - pp 30 - 35[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-2015041 RAB Revue Centre de documentation En réserve L003 Disponible Generating statistically robust multipath stacking maps using congruent cells / Thomas Fuhrmann in GPS solutions, vol 19 n° 1 (January 2015)
[article]
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 IGN] congruence
[Termes IGN] correction du trajet multiple
[Termes IGN] résidu
[Termes IGN] superposition
[Termes IGN] trajet multiple
[Termes IGN] valeur aberranteRésumé : (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
in GPS solutions > vol 19 n° 1 (January 2015) . - pp 83 - 92[article]The carrier-multipath observable: a new carrier-phase multipath mitigation technique / Ramin Moradi in GPS solutions, vol 19 n° 1 (January 2015)
[article]
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 IGN] correction du trajet multiple
[Termes IGN] trajet multipleRésumé : (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
in GPS solutions > vol 19 n° 1 (January 2015) . - pp 73 - 82[article]PermalinkLimnimétrie par réflectométrie GNSS à faible coût / Eduardo Rodrigues in XYZ, n° 139 (juin - août 2014)PermalinkLocalisation de véhicule par satellites couplée à la navigation à l'estime et aux données cartographiques / David Bétaille (2014)PermalinkHunting for GNSS echoes: analysis of signal tracking techniques for multipath mitigation / Antonio Fernandez in GPS world, vol 24 n° 11 (November 2013)PermalinkUrban 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)PermalinkTime-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)PermalinkEvaluation et surveillance des effets du multi-trajets dans les stations GNSS permanentes / Loïc Grondin (2013)PermalinkGPS snow depth meter with geometry-free linear combinations of carrier phases / M. Ozeki in Journal of geodesy, vol 86 n° 3 (March 2012)PermalinkPermalinkMultipath minimization method: mitigation through adaptive filtering for machine automation applications / L. Serrano in GPS world, vol 22 n° 7 (July 2011)Permalink