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Kalman-filter-based undifferenced cycle slip estimation in real-time precise point positioning / Pan Li in GPS solutions, vol 23 n° 4 (October 2019)  

Public [article]  inGPS solutions > vol 23 n° 4 (October 2019) Titre : Kalman-filter-based undifferenced cycle slip estimation in real-time precise point positioning Type de document : Article/Communication Auteurs : Pan Li, Auteur ; Xinyuan Jiang, Auteur ; Xiaohong Zhang, Auteur ; et al., Auteur Année de publication : 2019 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes descripteurs IGN] filtre de Kalman [Termes descripteurs IGN] glissement de cycle [Termes descripteurs IGN] interruption du signal [Termes descripteurs IGN] mesurage de phase [Termes descripteurs IGN] modèle mathématique [Termes descripteurs IGN] positionnement cinématique [Termes descripteurs IGN] positionnement ponctuel précis [Termes descripteurs IGN] précision du positionnement [Termes descripteurs IGN] station GLONASS [Termes descripteurs IGN] station GPS [Termes descripteurs IGN] temps réel Résumé : (Auteur) Global navigation satellite system (GNSS) precise point positioning (PPP) requires continuous carrier-phase observations to achieve a solution of high precision. Precisely correcting cycle slips caused by signal interruptions is crucial for recovering the data continuity. Most of the existing approaches usually employ only data of one epoch after the interruption for real-time cycle slip processing. In this study, we propose to introduce and estimate cycle slip parameters together with standard PPP parameters, such as position, ionospheric delay, and ambiguities in the case that possible cycle slips are detected, using a Kalman-filter-based procedure with the undifferenced and uncombined PPP model. The integer search strategy is used to fix cycle slips. To reduce the probability of wrong integer fixing, a strict integer validation threshold is suggested. As a result, it is not easy to fix all cycle slips with only one epoch of data. Our approach can be easily extended to use multi-epoch observations to enhance the cycle slip estimation. Once the cycle slips are correctly determined, continuous PPP can be achieved instantaneously. This new approach is tested and validated with three groups of experiments using GPS and GLONASS stations operated by the International GNSS Service from DOY 1–10, 2017, and a real vehicle kinematic data. Numerous experimental results showed that the proposed method can correctly fix the cycle slips for more than 99.5% of epochs suffering from re-convergence. On average, this method takes observation information from about 1.5–2.5 epochs to fix cycle slips and realize rapid re-convergence. Consequently, positioning performance is significantly improved. Numéro de notice : A2019-334 Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s10291-019-0894-3 date de publication en ligne : 16/07/2019 En ligne : https://doi.org/10.1007/s10291-019-0894-3 Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=93423 [article]

Maintaining real-time precise point positioning during outages of orbit and clock corrections / Ahmed El-Mowafy in GPS solutions, vol 21 n° 3 (July 2017)  

Public [article]  inGPS solutions > vol 21 n° 3 (July 2017) . - pp 937 – 947 Titre : Maintaining real-time precise point positioning during outages of orbit and clock corrections Type de document : Article/Communication Auteurs : Ahmed El-Mowafy, Auteur ; Manoj Deo, Auteur ; Nobuaki Kubo, Auteur Année de publication : 2017 Article en page(s) : pp 937 – 947 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes descripteurs IGN] horloge [Termes descripteurs IGN] International GNSS Service [Termes descripteurs IGN] international GPS service for geodynamics [Termes descripteurs IGN] interruption du signal [Termes descripteurs IGN] orbitographie [Termes descripteurs IGN] positionnement cinématique en temps réel [Termes descripteurs IGN] positionnement ponctuel précis [Termes descripteurs IGN] précision décimétrique [Termes descripteurs IGN] prévision Résumé : (auteur) The precise point positioning (PPP) is a popular positioning technique that is dependent on the use of precise orbits and clock corrections. One serious problem for real-time PPP applications such as natural hazard early warning systems and hydrographic surveying is when a sudden communication break takes place resulting in a discontinuity in receiving these orbit and clock corrections for a period that may extend from a few minutes to hours. A method is presented to maintain real-time PPP with 3D accuracy less than a decimeter when such a break takes place. We focus on the open-access International GNSS Service (IGS) real-time service (RTS) products and propose predicting the precise orbit and clock corrections as time series. For a short corrections outage of a few minutes, we predict the IGS-RTS orbits using a high-order polynomial, and for longer outages up to 3 h, the most recent IGS ultra-rapid orbits are used. The IGS-RTS clock corrections are predicted using a second-order polynomial and sinusoidal terms. The model parameters are estimated sequentially using a sliding time window such that they are available when needed. The prediction model of the clock correction is built based on the analysis of their properties, including their temporal behavior and stability. Evaluation of the proposed method in static and kinematic testing shows that positioning precision of less than 10 cm can be maintained for up to 2 h after the break. When PPP re-initialization is needed during the break, the solution convergence time increases; however, positioning precision remains less than a decimeter after convergence. Numéro de notice : A2017-442 Thématique : POSITIONNEMENT Nature : Article DOI : 10.1007/s10291-016-0583-4 En ligne : https://doi.org/10.1007/s10291-016-0583-4 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=86360 [article]

Efficient obstruction analysis for GNSS relative positioning of terrestrial mobile mapping system / J.Y. Han in Survey review, vol 47 n° 342 (May 2015)  

Public [article]  inSurvey review > vol 47 n° 342 (May 2015) . - pp 153 - 162 Titre : Efficient obstruction analysis for GNSS relative positioning of terrestrial mobile mapping system Type de document : Article/Communication Auteurs : J.Y. Han, Auteur ; J. Guo, Auteur ; J.Y. Chuang, Auteur Année de publication : 2015 Article en page(s) : pp 153 - 162 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes descripteurs IGN] interruption du signal [Termes descripteurs IGN] modèle numérique de terrain [Termes descripteurs IGN] positionnement cinématique en temps réel [Termes descripteurs IGN] positionnement différentiel [Termes descripteurs IGN] positionnement par GNSS [Termes descripteurs IGN] prévision [Termes descripteurs IGN] système de numérisation mobile Résumé : (auteur) A mobile mapping system MMS is a combination of several modern sensors and is capable of acquiring meticulous spatial information in a fast and automatic manner. However, the result obtained is highly dependent on the quality of the global navigation satellite system GNSS which is expected to constantly provide accurate positioning solutions for the system. As a consequence, in an urban or mountainous area where satellite signals are frequently obstructed by local topography, the reliability of a terrestrial MMS system is not always guaranteed. In this study, a rigorous approach for predicting GNSS satellite reception under topographic obstructions along an MMS surveyed path is developed. By utilising a digital terrain model and a lineofsight analysis, visible satellites for a moving platform are identified and used for estimating positioning quality under a GNSS relative positioning model. Based on the results from real case studies, it is illustrated that the proposed approach provides a reliable prediction for GNSS satellite obstruction and relative positioning quality. Consequently, the locations andor epochs associated with poor GNSS positioning qualities can be identified beforehand and an appropriate survey schedule can thus be arranged. Numéro de notice : A2015-929 Thématique : POSITIONNEMENT Nature : Article DOI : 10.1179/1752270614Y.0000000110 En ligne : https://doi.org/10.1179/1752270614Y.0000000110 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79734 [article]

GNSS and ionospheric scintillation: how to survive the next solar maximum / P. Kintner in Inside GNSS, vol 4 n° 4 (July - August 2009) 

Public [article]  inInside GNSS > vol 4 n° 4 (July - August 2009) . - 9 p. ; pp 22 - 30 Titre : GNSS and ionospheric scintillation: how to survive the next solar maximum Type de document : Article/Communication Auteurs : P. Kintner, Auteur ; T. Humphreys, Auteur ; J. Hinks, Auteur Année de publication : 2009 Article en page(s) : 9 p. ; pp 22 - 30 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes descripteurs IGN] interruption du signal [Termes descripteurs IGN] perturbation ionosphérique [Termes descripteurs IGN] positionnement par GNSS [Termes descripteurs IGN] système de positionnement par satellites [Termes descripteurs IGN] tempête magnétique Résumé : (Auteur) The approaching solar maximum will produce magnetic storms, ionospheric storms, and disruptions to radio signals that directly affect the world’s technical infrastructure, including GNSS. The authors propose a method for evaluating the ability of GPS receivers to operate through scintillation before the next solar maximum arrives in 2013. Copyright Gibbons Media & Research LLC Numéro de notice : A2009-663 Thématique : POSITIONNEMENT Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33564 [article]

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