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An adaptive stochastic model for GPS observations and its performance in precise point positioning / J. Z. Zheng in Survey review, vol 48 n° 349 (July 2016)
[article]
Titre : An adaptive stochastic model for GPS observations and its performance in precise point positioning Type de document : Article/Communication Auteurs : J. Z. Zheng, Auteur ; F. Guo, Auteur Année de publication : 2016 Article en page(s) : pp 296 - 302 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] bruit (théorie du signal)
[Termes IGN] correction ionosphérique
[Termes IGN] fenêtre (informatique)
[Termes IGN] mesurage de pseudo-distance
[Termes IGN] modèle stochastique
[Termes IGN] positionnement par GPS
[Termes IGN] récepteur GPS
[Termes IGN] temps réelRésumé : (auteur) In this paper, the stochastic characteristics of Global Positioning System (GPS) pseudo-range noise as influenced by several factors such as receiver type, frequency, and ionosphere environment are analysed. The results indicate that the noise level of GPS observations is significantly affected by these factors. Moreover, the noise level is so mutable that it cannot be generalised and described by a uniform empirical model. Even for the same satellite, the noise level of observations may fluctuate sharply in both spatial and temporal resolution. To establish a reasonable stochastic model, a recursive sliding window method for estimating pseudo-range noise in real time is introduced. The effectiveness of the proposed method is verified by specific computational examples. Numéro de notice : A2016-626 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1179/1752270615Y.0000000033 En ligne : https://doi.org/10.1179/1752270615Y.0000000033 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81842
in Survey review > vol 48 n° 349 (July 2016) . - pp 296 - 302[article]GNSS multipath detection using three-frequency signal-to-noise measurements / Philip R.R. Strode in GPS solutions, vol 20 n° 3 (July 2016)
[article]
Titre : GNSS multipath detection using three-frequency signal-to-noise measurements Type de document : Article/Communication Auteurs : Philip R.R. Strode, Auteur ; Paul D. Groves, Auteur Année de publication : 2016 Article en page(s) : pp 399 - 412 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] correction du trajet multiple
[Termes IGN] diffraction
[Termes IGN] rapport signal sur bruit
[Termes IGN] récepteur GNSS
[Termes IGN] récepteur trifréquence
[Vedettes matières IGN] Traitement de données GNSSRésumé : (Auteur) A new technique for detecting GNSS multipath interference by comparing signal-to-noise (SNR) measurements on three frequencies is presented. Depending on the phase lag of the reflected signal with respect to the direct signal, multipath interference can be either constructive or destructive, with a commensurate effect on the measured SNR. However, as the phase lag is frequency dependent, the SNR is perturbed differently on each frequency. Thus, by differencing SNR measurements on different frequencies and comparing the result with that obtained in a low-multipath environment, multipath can be detected. Using three frequencies makes the process more robust. A three-frequency SNR-based multipath detector has been developed and calibrated using measurements from GPS Block IIF satellites in a low-multipath environment. The new detector has been tested in a range of urban environments and its multipath detection capability verified by showing that the MP observables oscillate when the new detection statistic is above a threshold value determined using data collected in a low-multipath environment. The new detector is also sensitive to diffraction. Numéro de notice : A2016-631 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1007/s10291-015-0449-1 En ligne : http://dx.doi.org/10.1007/s10291-015-0449-1 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81834
in GPS solutions > vol 20 n° 3 (July 2016) . - pp 399 - 412[article]Improving the quality of low-cost GPS receiver data for monitoring using spatial correlations / Li Zhang in Journal of applied geodesy, vol 10 n° 2 (June 2016)
[article]
Titre : Improving the quality of low-cost GPS receiver data for monitoring using spatial correlations Type de document : Article/Communication Auteurs : Li Zhang, Auteur ; Volker Schwieger, Auteur Année de publication : 2016 Article en page(s) : pp 119 - 129 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] correction du trajet multiple
[Termes IGN] corrélation automatique de points homologues
[Termes IGN] coût
[Termes IGN] récepteur GPS
[Termes IGN] récepteur monofréquence
[Vedettes matières IGN] Traitement de données GNSSRésumé : (auteur) The investigations on low-cost single frequency GPS receivers at the Institute of Engineering Geodesy (IIGS) show that u-blox LEA-6T GPS receivers combined with Trimble Bullet III GPS antennas containing self-constructed L1-optimized choke rings can already obtain an accuracy in the range of millimeters which meets the requirements of geodetic precise monitoring applications (see [27]). However, the quality (accuracy and reliability) of low-cost GPS receiver data, particularly in shadowing environment, should still be improved, since the multipath effects are the major error for the short baselines.
For this purpose, several adjoined stations with low-cost GPS receivers and antennas were set up next to the metal wall on the roof of the IIGS building and measured statically for several days. The time series of three-dimensional coordinates of the GPS receivers were analyzed. Spatial correlations between the adjoined stations, possibly caused by multipath effect, will be taken into account. The coordinates of one station can be corrected using the spatial correlations of the adjoined stations, so that the quality of the GPS measurements is improved.
The developed algorithms are based on the coordinates and the results will be delivered in near-real-time (in about 30 minutes), so that they are suitable for structural health monitoring applications.Numéro de notice : A2016-559 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1515/jag-2015-0022 En ligne : http://dx.doi.org/10.1515/jag-2015-0022 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81738
in Journal of applied geodesy > vol 10 n° 2 (June 2016) . - pp 119 - 129[article]Inter-signal correction sensitivity analysis : aperture-dependent delays induced by antenna anisotropy in modernized GPS dual-frequency navigation / Gary Okerson in Inside GNSS, vol 11 n° 3 (May - June 2016)
[article]
Titre : Inter-signal correction sensitivity analysis : aperture-dependent delays induced by antenna anisotropy in modernized GPS dual-frequency navigation Type de document : Article/Communication Auteurs : Gary Okerson, Auteur ; Jeff Ross, Auteur ; Avram Tetewsky, Auteur ; Arnold Soltz, Auteur ; et al., Auteur Année de publication : 2016 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] analyse de sensibilité
[Termes IGN] anisotropie
[Termes IGN] antenne GPS
[Termes IGN] récepteur bifréquenceRésumé : (auteur) Cost-conscious civilian GPS receiver designers are faced with decisions as to whether to invest in L1/L2 front-ends or L1/L5 front–ends, as well as whether they want to expend the extra bandwidth to use narrow chip tap spacings. If a dual-frequency correction is made with one signal from GPS and the other from a different GNSS system, the designer must consider the signal attributes that will best serve their customers. GPS specification documents IS-GPS-200H and IS-GPS-705 provide the new modernized dual-frequency correction algorithm that uses inter-signal corrections to align all new GPS signals with the dual L1 and L2 PY ionosphere-free reference. This article provides the physics, derivations, and error budgets needed to go beyond the equations as presented in those specification documents. It will provide insights into how L1 and L2 and L1 and L5 dual-frequency alignment actually works when satellite antenna anisotropy is present, and, in particular, will provide receiver designers the additional insights needed for their specific application markets. Numéro de notice : A2016-598 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans En ligne : http://www.insidegnss.com/node/4957 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81779
in Inside GNSS > vol 11 n° 3 (May - June 2016)[article]Listening for RF noise : An analysis of pre-despreading GNSS interference detection techniques / Ali Jafarnia-Jahromi in Inside GNSS, vol 11 n° 3 (May - June 2016)
[article]
Titre : Listening for RF noise : An analysis of pre-despreading GNSS interference detection techniques Type de document : Article/Communication Auteurs : Ali Jafarnia-Jahromi, Auteur ; Nahal Fadaei, Auteur ; Saeed Daneshmand, Auteur ; Ali Broumandan, Auteur ; Gérard Lachapelle, Auteur Année de publication : 2016 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] analyse comparative
[Termes IGN] brouillage
[Termes IGN] détection automatique
[Termes IGN] interférence
[Termes IGN] radiofréquence
[Termes IGN] récepteur Galileo
[Termes IGN] récepteur GPS
[Termes IGN] signal Galileo
[Termes IGN] signal GPSRésumé : (auteur) Interference countermeasures are receiving increased attention in the GNSS community due, in part, to the advent of portable jamming modules. This article provides an overview on the vulnerability of GPS and Galileo receivers to continuous wave and chirp interference signals and compares the performance of interference-detection methods in terms of detection capability, detection latency, sensitivity to interference power, and computational and hardware complexity. Numéro de notice : A2016-597 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans En ligne : http://www.insidegnss.com/node/4955 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81778
in Inside GNSS > vol 11 n° 3 (May - June 2016)[article]There's an app for that : using a smartphone for GNSS ionospheric data collection / Andrew Kennedy in GPS world, vol 27 n° 6 (June 2016)PermalinkEvaluation of single frequency GPS precise point positioning assisted with external ionosphere sources / Reza Ghoddousi-Fard in Advances in space research, vol 57 n° 10 (May 2016)PermalinkEvaluating the use of GPS heights in water conservation applications / Ahmed F. Elaksher in Survey review, vol 48 n° 348 (May 2016)PermalinkGNSS threat quantification in the United Kingdom in 2015 / Chaz Dixon in Navigation aérienne, maritime, spatiale, terrestre, vol 63 n° 250 (mai - août 2016)PermalinkA study on the dependency of GNSS pseudorange biases on correlator spacing / André Hauschild in GPS solutions, vol 20 n° 2 (April 2016)PermalinkCombined Architecture : Enhancing Multi-Dimensional Signal Quality in GNSS Receivers / Nunzia Giorgia Ferrara in Inside GNSS, vol 11 n° 2 (March - April 2016)PermalinkIls vont mesurer la mer / Michel Ravelet in Géomètre, n° 2134 (mars 2016)PermalinkPermalinkPotential of GPS common clock single-differences for deformation monitoring / Steffen Schön in Journal of applied geodesy, vol 10 n° 1 (March 2016)PermalinkA new high-precision and low-power GNSS receiver for long-term installations in remote areas / David H. Jones in Geoscientific instrumentation methods and data systems, vol 5 n° 1 (January - June 2016)PermalinkPermalinkDéveloppement d'une perche pour des acquisitions terrestres par photogrammétrie légère et géo-référencement assisté par couplage GNSS bi-fréquence / Benjamin Grigoroff (2016)PermalinkSurveillance de santé structurale des ouvrages d’art incluant les systèmes de positionnement par satellites / Camille Favre (2016)PermalinkLes grands arcs de méridien du XIXème [dix-neuvième] siècle et la forme de la Terre / James Lequeux in XYZ, n° 145 (décembre 2015 - février 2016)PermalinkOutputs from the general development project in 2011-2014 towards the realization of multi-GNSS surveying in Japan / Hiromichi Tsuji in Bulletin of the GeoSpatial Information authority of Japan, vol 63 (December 2015)PermalinkUAS Experiences in Africa / Marius Schrôder in GIM international [en ligne], vol 29 n° 12 (December 2015)PermalinkAnalysis of a GNSS network using the theory of reliability for multiple outliers / M Mustafa Berber in Geodetski vestnik, vol 59 n° 3 (September - November 2015)PermalinkIdentification of movements using different geodetic methods of deformation analysis / Zoran Sušić in Geodetski vestnik, vol 59 n° 3 (September - November 2015)PermalinkNew data processing strategy for single frequency GPS deformation monitoring / S-Q. Huang in Survey review, vol 47 n° 344 (September 2015)PermalinkCODE’s new solar radiation pressure model for GNSS orbit determination / Daniel Arnold in Journal of geodesy, vol 89 n° 8 (August 2015)Permalink