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Triple-frequency PPP ambiguity resolution with multi-constellation GNSS: BDS and Galileo / Xingxing Li in Journal of geodesy, vol 93 n° 8 (August 2019)  

Public [article]  inJournal of geodesy > vol 93 n° 8 (August 2019) . - pp 1105 - 1122 Titre : Triple-frequency PPP ambiguity resolution with multi-constellation GNSS: BDS and Galileo Type de document : Article/Communication Auteurs : Xingxing Li, Auteur ; Xin Li, Auteur ; Gege Liu, Auteur ; et al., Auteur Année de publication : 2019 Article en page(s) : pp 1105 - 1122 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes descripteurs IGN] ambiguïté entière [Termes descripteurs IGN] constellation BeiDou [Termes descripteurs IGN] constellation GNSS [Termes descripteurs IGN] estimation de position [Termes descripteurs IGN] fréquence multiple [Termes descripteurs IGN] mesurage de phase [Termes descripteurs IGN] positionnement cinématique [Termes descripteurs IGN] positionnement par Galileo [Termes descripteurs IGN] positionnement ponctuel précis [Termes descripteurs IGN] positionnement statique [Termes descripteurs IGN] résolution d'ambiguïté Résumé : (auteur) Multi-constellation GNSS (multi-GNSS) and multi-frequency signals open new prospects for fast ambiguity resolution (AR) of precise point positioning (PPP). Currently, all the BDS and Galileo satellites are capable of transmitting signals on three or more frequencies. In this contribution, we investigate the triple-frequency PPP ambiguity resolution with B1, B2 and B3 observations from BDS satellites and E1, E5a and E5b observations from Galileo satellites and evaluate the contribution of BDS + Galileo combination to triple-frequency PPP AR. The uncalibrated phase delay (UPD) products are estimated based on triple-frequency observations, and the temporal characteristic as well as the residual distributions are analyzed. Our results show that the extra-wide-lane (EWL) and wide-lane (WL) UPDs for BDS and Galileo satellites are both stable during the 30 days and the daily narrow-lane (NL) UPD series are also steady with no obvious fluctuation. The Galileo UPDs exhibit better performance than BDS UPDs due to the high-quality observations. It is also interesting to find that the EWL UPD corrections for all Galileo satellites are very close to the zero. With the precise UPD products, the triple-frequency PPP AR with BDS and Galileo observations was implemented in both static and kinematic modes. Compared to the ambiguity-float solution, the performance can be significantly improved by triple-frequency PPP AR with the positioning accuracy improved by 30–70% in both static and kinematic modes. Moreover, the triple-frequency PPP fixed solutions also present better performance than the dual-frequency PPP fixed solutions in terms of time to the first fix and positioning accuracy, especially for the Galileo-only and BDS + Galileo solutions. And the fusion of multi-GNSS (BDS and Galileo) can further improve the position estimations compared to the single system with more satellites and better spatial geometry. Numéro de notice : A2019-380 Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-019-01229-x date de publication en ligne : 01/02/2019 En ligne : https://doi.org/10.1007/s00190-019-01229-x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=93457 [article]

A fresh look at GNSS anti-jamming / Daniele Borio in Inside GNSS, vol 12 n° 5 (September - October 2017)  

Public [article]  inInside GNSS > vol 12 n° 5 (September - October 2017) . - pp 54 - 61 Titre : A fresh look at GNSS anti-jamming Type de document : Article/Communication Auteurs : Daniele Borio, Auteur ; Pau Closas, Auteur Année de publication : 2017 Article en page(s) : pp 54 - 61 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement du signal [Termes descripteurs IGN] anti-leurrage [Termes descripteurs IGN] brouillage [Termes descripteurs IGN] estimation de position [Termes descripteurs IGN] interférence [Termes descripteurs IGN] méthode robuste [Termes descripteurs IGN] mitigation [Termes descripteurs IGN] signal GNSS Résumé : (auteur) Although strong jamming can overwhelm much weaker GNSS signals, receiver performance can be significantly improved by implementing interference mitigation techniques. With this article we briefly discuss the most common approaches for interference mitigation and frame them with respect to the principles of Interference Cancellation (IC) and robust estimation. Additionally, we present initial results obtained using Robust Transform Domain (RTD) mitigation techniques. These techniques provide effective alternatives to Transform Domain excision, enabling receiver operations in the close proximity of a jammer. Numéro de notice : A2017-583 Thématique : POSITIONNEMENT Nature : Article En ligne : http://www.insidegnss.com/node/5618 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=86718 [article]

A method for assessing generalized data accuracy with linear object resolution verification / Tadeusz Chrobak in Geocarto international, vol 32 n° 3 (March 2017)  

Public [article]  inGeocarto international > vol 32 n° 3 (March 2017) . - pp 238-256 Titre : A method for assessing generalized data accuracy with linear object resolution verification Type de document : Article/Communication Auteurs : Tadeusz Chrobak, Auteur ; Stanisław Szombara, Auteur ; Krystian Kozoł, Auteur ; Michal Lupa, Auteur Année de publication : 2017 Article en page(s) : pp 238-256 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes descripteurs IGN] détection de conflit [Termes descripteurs IGN] espace euclidien [Termes descripteurs IGN] estimation de position [Termes descripteurs IGN] généralisation automatique de données [Termes descripteurs IGN] généralisation cartographique [Termes descripteurs IGN] objet géographique linéaire [Termes descripteurs IGN] précision cartographique [Termes descripteurs IGN] simplification de contour [Vedettes matières IGN] Généralisation Résumé : (Auteur) The article is composed of two sections. In the first section, the authors describe the application of minimum line dimensions which are dependent on line shape, width and the operational scale of the map. The proposed solutions are based on the Euclidean metric space, for which the minimum dimensions of Saliszczew’s elementary triangle (Elementary triangle – is the term pertaining to model, standard triangle of least dimensions securing recognizability of a line. Its dimensions depend on scale of the map and width of the line representing it. The use of a triangle in the simplification process is as follows: triangles with sides (sections) on an arbitrary line and bases (completing the sides) are compared with lengths of the shorter side and the base of the elementary triangle.) were adapted. The second part of the article describes an application of minimum line dimensions for verifying and assessing generalized data. The authors also propose a method for determining drawing line resolution to evaluate the accuracy of algorithm simplification. Taking advantage of the proposed method, well-known simplification algorithms were compared on the basis of qualitative and quantitative evaluation. Moreover, corresponding with the methods of simplified data accuracy assessment the authors have extended these solutions with the rejected data. This procedure has allowed the identification of map areas where graphic conflicts occurred. Numéro de notice : A2017-270 Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern En ligne : http://dx.doi.org/10.1080/10106049.2015.1133721 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85296 [article]

Reflected blessings : position estimation using non-line-of-sight GPS signals / Yuting Ng in GPS world, vol 28 n° 3 (March 2017)

Public [article]  inGPS world > vol 28 n° 3 (March 2017) . - pp 42 - 47 Titre : Reflected blessings : position estimation using non-line-of-sight GPS signals Type de document : Article/Communication Auteurs : Yuting Ng, Auteur ; Grace Xingxin Gao, Auteur Année de publication : 2017 Article en page(s) : pp 42 - 47 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement du signal [Termes descripteurs IGN] estimation de position [Termes descripteurs IGN] signal GPS [Termes descripteurs IGN] signal hors ligne de visée [Termes descripteurs IGN] trajet multiple Résumé : (Auteur) Building obstructions and reflections present serious challenges to GPS receivers operating in urban environments. In such environments, buildings may obstruct GPS signals, leading to reduced GPS signal availability. In addition, buildings may reflect GPS signals, resulting in reception of nonline- of-sight (NLOS) signals. NLOS GPS signals are delayed versions of the line-of-sight (LOS) signals. As such, they lead to pseudorange errors, resulting in positioning errors. Conventional approaches treat NLOS GPS signals as unwanted interference to be rejected or mitigated. Numéro de notice : A2017-291 Thématique : POSITIONNEMENT Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85326 [article]

Automatic orthorectification of high-resolution optical satellite images using vector roads / Aleš Marsetič in IEEE Transactions on geoscience and remote sensing, vol 53 n° 11 (November 2015)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 53 n° 11 (November 2015) . - pp 6035 - 6047 Titre : Automatic orthorectification of high-resolution optical satellite images using vector roads Type de document : Article/Communication Auteurs : Aleš Marsetič, Auteur ; Krištof Oštir, Auteur ; Mojca Kosmatin-Fras, Auteur Année de publication : 2015 Article en page(s) : pp 6035 - 6047 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes descripteurs IGN] capteur en peigne [Termes descripteurs IGN] chaîne de traitement [Termes descripteurs IGN] colinéarité [Termes descripteurs IGN] élément d'orientation externe [Termes descripteurs IGN] estimation de position [Termes descripteurs IGN] extraction de données [Termes descripteurs IGN] géoréférencement [Termes descripteurs IGN] image RapidEye [Termes descripteurs IGN] modélisation géométrique de prise de vue [Termes descripteurs IGN] orthorectification automatique [Termes descripteurs IGN] système de coordonnées Résumé : (Auteur) This paper presents a completely automatic processing chain for orthorectification of optical pushbroom sensors. The procedure is robust and works without manual intervention from raw satellite image to orthoimage. It is modularly divided in four main steps: metadata extraction, automatic ground control point (GCP) extraction, geometric modeling, and orthorectification. The GCP extraction step uses georeferenced vector roads as a reference and produces a file with a list of points and their accuracy estimation. The physical geometric model is based on collinearity equations and works with sensor-corrected (level 1) optical satellite images. It models the sensor position and attitude with second-order piecewise polynomials depending on the acquisition time. The exterior orientation parameters are estimated in a least squares adjustment, employing random sample consensus and robust estimation algorithms for the removal of erroneous points and fine-tuning of the results. The images are finally orthorectified using a digital elevation model and positioned in a national coordinate system. The usability of the method is presented by testing three RapidEye images of regions with different terrain configurations. Several tests were carried out to verify the efficiency of the procedure and to make it more robust. Using the geometric model, subpixel accuracy on independent check points was achieved, and positional accuracy of orthoimages was around one pixel. The proposed procedure is general and can be easily adapted to various sensors. Numéro de notice : A2015-772 Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2015.2431434 date de publication en ligne : 01/06/2015 En ligne : https://doi.org/10.1109/TGRS.2015.2431434 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=78828 [article]

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