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Measurement accuracy in Network-RTK / R. Emardson in Bulletin of geodesy and geomatics BGG, vol 69 n° 2 - 3 (December 2010)
[article]
Titre : Measurement accuracy in Network-RTK Type de document : Article/Communication Auteurs : R. Emardson, Auteur ; P. Jarlemark, Auteur ; et al., Auteur Année de publication : 2010 Article en page(s) : pp 211 - 225 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] données BeiDou
[Termes IGN] données Galileo
[Termes IGN] données GLONASS
[Termes IGN] données GPS
[Termes IGN] erreur de positionnement
[Termes IGN] hauteur ellipsoïdale
[Termes IGN] positionnement cinématique en temps réel
[Termes IGN] précision altimétrique
[Termes IGN] précision du positionnementRésumé : (Auteur) New satellite systems such as the European Galileo and the ongoing modernization of GPS and GLONASS, allow for improvements in accurate positioning. Real Time Kinematic (RTK) is a system that utilises Global Navigation Satellite Systems (GNSS) to provide accurate positioning in real time. In this paper, we describe the error sources in network-RTK, and how the increased number of satellites and new signals are best served to achieve the desired improvement in performance. Using simulations we find that the inclusion of future satellite systems such as Galileo and Compass can reduce the error in the vertical coordinate of the estimated position from 27 mm to 20 mm for a reference network with 70 km between the reference stations. For periods with high spatial variability in the ionosphere, it is important to consider the tradeoff between influence from the ionosphere and from the local environment. A densified network with 35 km between the reference stations results in a similar improvement as the contribution of the new satellite systems. The error in the estimated vertical coordinate is reduced from 27 mm to 18 mm. Using both a densified network and the new satellite systems reduces the error further down to 13 mm. Numéro de notice : A2010-597 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31341
in Bulletin of geodesy and geomatics BGG > vol 69 n° 2 - 3 (December 2010) . - pp 211 - 225[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 013-2010021 RAB Revue Centre de documentation En réserve L003 Disponible Precise point positioning with ATOMIUM using IGS orbit and clock products: first results / Quentin Baire in Bulletin of geodesy and geomatics BGG, vol 69 n° 2 - 3 (December 2010)
[article]
Titre : Precise point positioning with ATOMIUM using IGS orbit and clock products: first results Type de document : Article/Communication Auteurs : Quentin Baire, Auteur ; Carine Bruyninx, Auteur ; P. Defraigne, Auteur ; Juliette Legrand, Auteur Année de publication : 2010 Article en page(s) : pp 391 - 400 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] Atomium
[Termes IGN] positionnement ponctuel précis
[Termes IGN] propagation troposphérique
[Termes IGN] station de réception
[Termes IGN] traitement de données GNSS
[Termes IGN] transformation de HelmertRésumé : (Auteur) In this paper, we investigate the quality of the station positions determined by Precise Point Positioning using ATOMIUM. For that purpose, the IGS orbits and clock files are considered as a priori information while ATOMIUM estimates daily station positions, hourly tropospheric zenith path delays and epoch-wise station clock synchronization errors with respect to the IGS time. In addition to its very fast operation (a daily run takes about 5 seconds by station), the mean weekly position repeatability obtained with ATOMIUM is at the level of 3.9 mm for the north, 2.4 mm for the east and 6.8 mm for the up component. If in addition, a Helmert transformation is performed to more reliably express the solution in the IGS05, then the mean weekly station position repeatabilities reach 3.1 mm for the north, 1.9 mm for the east and 5.7 mm for the up component, i.e. similar to what is presently obtained with the Bernese. Numéro de notice : A2010-595 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31339
in Bulletin of geodesy and geomatics BGG > vol 69 n° 2 - 3 (December 2010) . - pp 391 - 400[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 013-2010021 RAB Revue Centre de documentation En réserve L003 Disponible Rapid re-convergences to ambiguity-fixed solutions in precise point positioning / J. Geng in Journal of geodesy, vol 84 n° 12 (December 2010)
[article]
Titre : Rapid re-convergences to ambiguity-fixed solutions in precise point positioning Type de document : Article/Communication Auteurs : J. Geng, Auteur ; X. Meng, Auteur ; A. Dodson, Auteur ; et al., Auteur Année de publication : 2010 Article en page(s) : 10 p. ; pp 705 - 714 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] ambiguïté entière
[Termes IGN] convergence
[Termes IGN] correction ionosphérique
[Termes IGN] positionnement par GPS
[Termes IGN] positionnement ponctuel précis
[Termes IGN] propagation ionosphérique
[Termes IGN] résolution d'ambiguïté
[Termes IGN] Suisse
[Termes IGN] temps réelRésumé : (Auteur) Integer ambiguity resolution at a single receiver can be achieved if the fractional-cycle biases are separated from the ambiguity estimates in precise point positioning (PPP). Despite the improved positioning accuracy by such integer resolution, the convergence to an ambiguity-fixed solution normally requires a few tens of minutes. Even worse, these convergences can repeatedly occur on the occasion of loss of tracking locks for many satellites if an open sky-view is not constantly available, consequently totally destroying the practicability of real-time PPP. In this study, in case of such re-convergences, we develop a method in which ionospheric delays are precisely predicted to significantly accelerate the integer ambiguity resolution. The effectiveness of this method consists in two aspects: first, wide-lane ambiguities can be rapidly resolved using the ionosphere-corrected wide-lane measurements, instead of the noisy Melbourne–Wübbena combination measurements; second, narrow-lane ambiguity resolution can be accelerated under the tight constraints derived from the ionosphere-corrected unambiguous wide-lane measurements. In the test at 90 static stations suffering from simulated total loss of tracking locks, 93.3 and 95.0% of re-convergences to wide-lane and narrow-lane ambiguity resolutions can be achieved within five epochs of 1-Hz measurements, respectively, even though the time latency for the predicted ionospheric delays is up to 180 s. In the test at a mobile van moving in a GPS-adverse environment where satellite number significantly decreases and cycle slips frequently occur, only when the predicted ionospheric delays are applied can the rate of ambiguity-fixed epochs be dramatically improved from 7.7 to 93.6% of all epochs. Therefore, this method can potentially relieve the unrealistic requirement of a continuous open sky-view by most PPP applications and improve the practicability of real-time PPP. Numéro de notice : A2010-558 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-010-0404-4 Date de publication en ligne : 14/08/2010 En ligne : https://doi.org/10.1007/s00190-010-0404-4 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30750
in Journal of geodesy > vol 84 n° 12 (December 2010) . - 10 p. ; pp 705 - 714[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-02010121 SL Revue Centre de documentation Revues en salle Disponible 266-2010121 SL Revue Centre de documentation Revues en salle Disponible Rapid static positioning using GPS and GLONASS / Gerhard Beutler in Bulletin of geodesy and geomatics BGG, vol 69 n° 2 - 3 (December 2010)
[article]
Titre : Rapid static positioning using GPS and GLONASS Type de document : Article/Communication Auteurs : Gerhard Beutler, Auteur ; Michael Meindl, Auteur Année de publication : 2010 Article en page(s) : pp 179 - 194 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] ambiguïté entière
[Termes IGN] Bernese
[Termes IGN] compensation Lambda
[Termes IGN] données GLONASS
[Termes IGN] données GNSS
[Termes IGN] positionnement statique rapide
[Termes IGN] résolution d'ambiguïté
[Termes IGN] traitement de données GNSSRésumé : (Auteur) For rapid static positioning, the combined analysis of all observed GNSS becomes more and more important in view of the steadily increasing number of active satellites (early in 2009 exceeding 50 GPS+GLONASS satellites). Successful ambiguity fixing for all involved GNSS is the key for this application. First results of an implementation of a «GNSS-capable» LAMBDA ambiguity resolution scheme into a project version of the Bernese Software are presented. Numéro de notice : A2010-596 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31340
in Bulletin of geodesy and geomatics BGG > vol 69 n° 2 - 3 (December 2010) . - pp 179 - 194[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 013-2010021 RAB Revue Centre de documentation En réserve L003 Disponible The combination of GNSS-levelling data and gravimetric (quasi-) geoid heights in the presence of noise / R. Klees in Journal of geodesy, vol 84 n° 12 (December 2010)
[article]
Titre : The combination of GNSS-levelling data and gravimetric (quasi-) geoid heights in the presence of noise Type de document : Article/Communication Auteurs : R. Klees, Auteur ; I. Prutkin, Auteur Année de publication : 2010 Article en page(s) : pp 731 - 749 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] altitude normale
[Termes IGN] altitude orthométrique
[Termes IGN] bruit (théorie du signal)
[Termes IGN] champ de pesanteur local
[Termes IGN] collocation par moindres carrés
[Termes IGN] données GNSS
[Termes IGN] géoïde gravimétrique
[Termes IGN] hauteur ellipsoïdale
[Termes IGN] matrice de covariance
[Termes IGN] nivellement par GPS
[Termes IGN] problème des valeurs limites
[Termes IGN] Suisse
[Termes IGN] varianceRésumé : (Auteur) We propose a methodology for the combination of a gravimetric (quasi-) geoid with GNSS-levelling data in the presence of noise with correlations and/or spatially varying noise variances. It comprises two steps: first, a gravimetric (quasi-) geoid is computed using the available gravity data, which, in a second step, is improved using ellipsoidal heights at benchmarks provided by GNSS once they have become available. The methodology is an alternative to the integrated processing of all available data using least-squares techniques or least-squares collocation. Unlike the corrector-surface approach, the pursued approach guarantees that the corrections applied to the gravimetric (quasi-) geoid are consistent with the gravity anomaly data set. The methodology is applied to a data set comprising 109 gravimetric quasi-geoid heights, ellipsoidal heights and normal heights at benchmarks in Switzerland. Each data set is complemented by a full noise covariance matrix. We show that when neglecting noise correlations and/or spatially varying noise variances, errors up to 10% of the differences between geometric and gravimetric quasi-geoid heights are introduced. This suggests that if high-quality ellipsoidal heights at benchmarks are available and are used to compute an improved (quasi-) geoid, noise covariance matrices referring to the same datum should be used in the data processing whenever they are available. We compare the methodology with the corrector-surface approach using various corrector surface models. We show that the commonly used corrector surfaces fail to model the more complicated spatial patterns of differences between geometric and gravimetric quasi-geoid heights present in the data set. More flexible parametric models such as radial basis function approximations or minimum-curvature harmonic splines perform better. We also compare the proposed method with generalized least-squares collocation, which comprises a deterministic trend model, a random signal component and a random correlated noise component. Trend model parameters and signal covariance function parameters are estimated iteratively from the data using non-linear least-squares techniques. We show that the performance of generalized least-squares collocation is better than the performance of corrector surfaces, but the differences with respect to the proposed method are still significant. Numéro de notice : A2010-559 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-010-0406-2 Date de publication en ligne : 29/08/2010 En ligne : https://doi.org/10.1007/s00190-010-0406-2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30751
in Journal of geodesy > vol 84 n° 12 (December 2010) . - pp 731 - 749[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-02010121 SL Revue Centre de documentation Revues en salle Disponible 266-2010121 SL Revue Centre de documentation Revues en salle Disponible Fast GNSS ambiguity resolution as an ill-posed problem / Lard Erik Sjöberg in Journal of geodesy, vol 84 n° 11 (November 2010)PermalinkThe celestial mechanics approach: application to data of the GRACE mission / Gerhard Beutler in Journal of geodesy, vol 84 n° 11 (November 2010)PermalinkThe system Galileo PRS delivery in question / Anonyme in GPS world, vol 21 n° 11 (November 2010)PermalinkRecord, Replay, Rewind : Testing GNSS Receivers with Record and Playback Techniques / D. Hall in GPS world, vol 21 n° 10 (October 2010)PermalinkCombinaison linéaire et l'intérêt de la troisième fréquence pour le positionnement en double différence par GPS / L. Tabti in XYZ, n° 124 (septembre - novembre 2010)PermalinkGPS IIF-1 satellite: Antenna phase center and attitude modeling / F. Dilssner in Inside GNSS, vol 5 n° 6 (September 2010)PermalinkInteger ambiguity resolution in precise point positionning : method comparison / J. Geng in Journal of geodesy, vol 84 n° 9 (September 2010)PermalinkA first look at the effects of ionospheric signal bending on a globally processed GPS network / E. Petrie in Journal of geodesy, vol 84 n° 8 (August 2010)PermalinkAviation grade : New GPS signals, chips off the block IIF / R.E. Phelts in Inside GNSS, vol 5 n° 5 (July - August 2010)PermalinkGLONASS CDMA: Some proposals on signal formats for future GNSS air interface / V. Ipatov in Inside GNSS, vol 5 n° 5 (July - August 2010)Permalink