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Performance analysis of GLONASS integration with GPS vectorised receiver in urban canyon positioning / Amir Tabatabaei in Survey review, vol 51 n° 368 (September 2019)  

Public [article]  inSurvey review > vol 51 n° 368 (September 2019) . - pp 460 - 471 Titre : Performance analysis of GLONASS integration with GPS vectorised receiver in urban canyon positioning Type de document : Article/Communication Auteurs : Amir Tabatabaei, Auteur ; Mohammad-Reza Mosavi, Auteur Année de publication : 2019 Article en page(s) : pp 460 - 471 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes descripteurs IGN] canyon urbain [Termes descripteurs IGN] positionnement par GNSS [Termes descripteurs IGN] positionnement statique [Termes descripteurs IGN] récepteur GLONASS [Termes descripteurs IGN] récepteur GPS [Termes descripteurs IGN] test de performance Résumé : (Auteur) Urban-canyon positioning encounters many problems such as successive attenuation and even blocking of the signals. Vectorised receiver is a solution in which stronger signals aid weak and blocked ones to be tracked and reacquired. On the other hand, limited accessibility to the sky makes trouble in the performance of navigation filter. As the result, integration of satellite-based positioning systems is suggested to increase the number of visible satellites in the receiver view. In this paper, the architecture of an implemented GPS-combined-GLONASS Vectorised Receiver (GGVR) in a software platform is explored and its advantages rather than a GPS-only Vectorised Receiver (GVR) are demonstrated analytically. Experimental tests in different static and dynamic scenarios are also included. The results show that in the urban-canyon trajectory where the GVR has only 80% availability, the GGVR positioning solution is 100% available in the whole movement duration. Numéro de notice : A2019-387 Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/00396265.2018.1481181 date de publication en ligne : 13/06/2018 En ligne : https://doi.org/10.1080/00396265.2018.1481181 Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=93477 [article]

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]

GNSS ionospheric TEC and positioning accuracy during intense space and terrestrial weather events in B&H / Randa Natraš in Geodetski vestnik, vol 63 n° 1 (March - May 2019)  

Public [article]  inGeodetski vestnik > vol 63 n° 1 (March - May 2019) . - pp 73 - 91 Titre : GNSS ionospheric TEC and positioning accuracy during intense space and terrestrial weather events in B&H Type de document : Article/Communication Auteurs : Randa Natraš, Auteur ; Dževad Krdžalić, Auteur ; Džana Horozović, Auteur ; et al., Auteur Année de publication : 2019 Article en page(s) : pp 73 - 91 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes descripteurs IGN] Bosnie-Herzégovine [Termes descripteurs IGN] ionosphère [Termes descripteurs IGN] neige [Termes descripteurs IGN] positionnement par GNSS [Termes descripteurs IGN] positionnement ponctuel précis [Termes descripteurs IGN] positionnement statique [Termes descripteurs IGN] précision du positionnement [Termes descripteurs IGN] tempête magnétique [Termes descripteurs IGN] teneur totale en électrons [Termes descripteurs IGN] troposphère Résumé : (Auteur) To achieve the high accuracy in GNSS positioning, the various atmospheric effects on GNSS signals need to be mitigated, where the major part present the ionised atmosphere (ionosphere) and the neutral atmosphere (troposphere). Additional signal scattering can occur from heavy precipitation and from snow accumulation on the antenna and on its surroundings. In this study, irregularities in the ionosphere induced by space weather were analysed, as well as sudden snowfall with its impact on meteorological conditions in the troposphere. State in the ionosphere was characterised by total electron content (TEC) derived from GNSS observation of EUREF Permanent Network (EPN) station SRJV in Bosnia and Herzegovina (B&H). Their impacts on the accuracy of GNSS positioning of the EPN station SRJV were examined by applying post-processing static PPP and network solutions using several software (the open-source and commercial). The study period was March 2015, when the strongest geomagnetic storm of solar cycle 24 (St. Patrick’s Day, March 17) and sudden intense snowfall (beginning of the month) occurred. Ionospheric TEC deviated for more than 20 TECU from the regular values during St. Patrick´s Day. Ionosphere-free combination in applied positioning techniques successfully eliminated most of the ionospheric terms. The highest deviations in Up component (to 7 cm) were observed during sudden snowfall characterised by changes in temperature, atmospheric pressure and humidity in the troposphere. Numéro de notice : A2019-167 Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.15292/geodetski-vestnik.2019.01.73-91 date de publication en ligne : 17/01/2019 En ligne : http://dx.doi.org/10.15292/geodetski-vestnik.2019.01.73-91 Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=92576 [article]

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Study on GPS–PPP precision for short observation sessions / Stefano Gandolfi in GPS solutions, vol 21 n° 3 (July 2017)  

Public [article]  inGPS solutions > vol 21 n° 3 (July 2017) . - pp 887 – 896 Titre : Study on GPS–PPP precision for short observation sessions Type de document : Article/Communication Auteurs : Stefano Gandolfi, Auteur ; Luca Tavasci, Auteur ; Luca Poluzzi, Auteur Année de publication : 2017 Article en page(s) : pp 887 – 896 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes descripteurs IGN] coordonnées géodésiques [Termes descripteurs IGN] Europe (géographie politique) [Termes descripteurs IGN] GIPSY-OASIS [Termes descripteurs IGN] positionnement ponctuel précis [Termes descripteurs IGN] positionnement statique [Termes descripteurs IGN] résolution d'ambiguïté [Termes descripteurs IGN] station GNSS Résumé : (auteur) Precise point positioning is increasingly being used in geodetic applications that in many cases are based on static 24-hour RINEX files. Since there are many applications where sub-centimeter position accuracy is not required and users wish to use a single receiver and not be dependent on differential correction, we will evaluate PPP performance for static positioning with 12-, 6-, 3-, 1- and ½-h observations. We have, therefore, considered a dataset for the year 2013 from 14 European GNSS stations. The data were analyzed using GIPSY-OASIS II software package and evaluated in terms of repeatability of the coordinates and of coherence with the formal error indicated for each PPP solution. Particular attention was paid to solutions showing large discrepancies in coordinates. The test shows that PPP precision for the 24-h files is below 5 mm, but decreases slightly for the 12-, 6- and 3-h observation sets. For the 1-h and the ½-h RINEX files, precision is within 5 and 10 cm, respectively. The analysis is completed with a discussion on the impact of the ambiguity resolution that shows how it significantly improves only the easting component and moreover has a higher influence on the formal error rather than on the solutions. Lastly, the study contains an investigation into the reliability of the formal error associated with the PPP solutions. We show that the formal error can be used to identify incorrect solutions, but is not suitable to represent the real accuracy. For that reason, we propose to use the formal error given for the float solutions even for the ones with fixed ambiguities. Numéro de notice : A2017-440 Thématique : POSITIONNEMENT Nature : Article DOI : 10.1007/s10291-016-0575-4 En ligne : https://doi.org/10.1007/s10291-016-0575-4 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=86356 [article]

Performance analysis of precise point positioning using multi-constellation GNSS : GPS, GLONASS, Galileo and BeiDou / Mahmoud Abd Rabbou in Survey review, vol 49 n° 352 (March 2017)  

Public [article]  inSurvey review > vol 49 n° 352 (March 2017) . - pp 39 - 50 Titre : Performance analysis of precise point positioning using multi-constellation GNSS : GPS, GLONASS, Galileo and BeiDou Type de document : Article/Communication Auteurs : Mahmoud Abd Rabbou, Auteur ; Ahmed El-Rabbany, Auteur Année de publication : 2017 Article en page(s) : pp 39 - 50 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes descripteurs IGN] combinaison au niveau des observations [Termes descripteurs IGN] performance [Termes descripteurs IGN] positionnement par BeiDou [Termes descripteurs IGN] positionnement par Galileo [Termes descripteurs IGN] positionnement par GLONASS [Termes descripteurs IGN] positionnement par GNSS [Termes descripteurs IGN] positionnement par GPS [Termes descripteurs IGN] positionnement ponctuel précis [Termes descripteurs IGN] positionnement statique [Termes descripteurs IGN] précision du positionnement [Termes descripteurs IGN] simple différence Résumé : (Auteur) We developed a new GNSS PPP model, which combines the observations of GPS, GLONASS, Galileo and BeiDou satellite navigation systems for precise applications. Both undifferenced and between-satellite single-difference (BSSD) ionosphere-free GNSS PPP models are developed. The contribution of the new GNSS observations is assessed compared with the existing GPS and GPS/GLONASS PPP using three-hours GNSS static data positioning results for several GNSS stations and four consecutive days. Inter-system biases between GPS and other GNSS systems are obtained as additional unknowns in the developed PPP filter. The results indicate that both GPS and GPS/Galileo PPP present comparable positioning accuracy level, which is attributed to the limited number of Galileo satellites. The additional BeiDou observations enhances the positioning accuracy after 15 minutes by 5 cm, 4 cm and 9 cm in latitude, longitude and altitude, respectively compared with GPS only positioning accuracy. However, the BeiDou only PPP results present less accurate positioning accuracy compared with the GPS only PPP. The multi-constellation GNSS PPP enhances the positioning accuracy by 8 cm, 6 cm and 11 cm in latitude, longitude and altitude, respectively compared with the GPS PPP results. Compared with the undifferenced PPP results, the BSSD model enhances the positioning accuracy after 15 minutes for the different GNSS constellations based PPP. The GPS/Galileo PPP positioning accuracy improves by 30%, 27% and 10% in latitude, longitude and altitude, respectively and the GPS/BeiDou PPP positioning accuracy, enhances by 17%, 22% and 15% in latitude, longitude and altitude, respectively while the multi-constellation GNSS PPP positioning accuracy improves by 22% and 15% in latitude and altitude, respectively over the undifferenced PPP technique. Additionally, the BSSD model is found to be superior with respect to the convergence times for the different GNSS combinations based PPP over the traditional undifferenced PPP model. Numéro de notice : A2017-058 Thématique : POSITIONNEMENT Nature : Article DOI : 10.1080/00396265.2015.1108068 En ligne : https://doi.org/10.1080/00396265.2015.1108068 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=84266 [article]

Static GNSS precise point positioning using free online services for Africa / Anis Abdallah in Survey review, vol 48 n° 346 (January 2016)  

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Precision comparison and analysis of four online free PPP services in static positioning and tropospheric delay estimation / Qiuying Guo in GPS solutions, vol 19 n° 4 (october 2015)  

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Estimation of multi-constellation GNSS observation stochastic properties using single receiver single satellite data validation method / A. El-Mowafy in Survey review, vol 47 n° 341 (March 2015)  

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Performance analysis of GPS / GALILEO PPP model for static and kinematic applications / Mahmoud Abd-El-Rahman in Geomatica [en ligne], vol 69 n° 1 (March 2015)  

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GPS for land surveyors / Jan Van Sickle (2015)

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Korrektur stationsabhängiger Fehler bei GNSS / Andreas Knöpfler (2015) 

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Initial results of precise orbit and clock determination for COMPASS navigation satellite system / Qile Zhao in Journal of geodesy, vol 87 n° 5 (May 2013)  

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Méthodes de travail dans les réseaux GNSS, 3ème partie Méthodes du "statique multi-stations" / Romain Legros in XYZ, n° 134 (mars - mai 2013) 

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Méthodes de travail dans les réseaux GNSS, 2ème partie Le positionnement statique suivant les méthodes indirectes du pivot central ou de la station virtuelle. / Romain Legros in XYZ, n° 133 (décembre 2012 - février 2013)

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Méthodes de travail dans les réseaux GNSS, 1ère partie Le positionnement statique temps-réel par "filtrage et moyenne de positions NRTK" / Romain Legros in XYZ, n° 132 (septembre - novembre 2012) 

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