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An advanced GNSS code multipath detection and estimation algorithm / Negin Sokhandan in GPS solutions, vol 20 n° 4 (October 2016)  

Public [article]  inGPS solutions > vol 20 n° 4 (October 2016) . - pp 627 - 640 Titre : An advanced GNSS code multipath detection and estimation algorithm Type de document : Article/Communication Auteurs : Negin Sokhandan, Auteur ; James T. Curran, Auteur ; Ali Broumandan, Auteur ; Gérard Lachapelle, Auteur Année de publication : 2016 Article en page(s) : pp 627 - 640 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] code GNSS [Termes IGN] méthode du maximum de vraisemblance (estimation) [Termes IGN] milieu urbain [Termes IGN] modèle de simulation [Termes IGN] positionnement par GNSS [Termes IGN] système de navigation [Termes IGN] trajet multiple Résumé : (Auteur) A novel maximum likelihood-based range estimation algorithm is designed to provide robustness to multipath, which is recognized as a dominant error source in DS-CDMA-based navigation systems. The detection–estimation problem is jointly solved to sequentially estimate the parameters of each individual multipath component and predict the existence of a next possible component. A comparison between contemporary maximum likelihood-based multipath estimation techniques and this new technique is provided. A selection of realistic channel simulation models is used to assess relative performance under different operating situations. A set of real GPS L1/CA data processing results are also presented to further assess the applicability of the proposed algorithm for urban navigation. Numéro de notice : A2016--025 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1007/s10291-015-0475-z En ligne : http://dx.doi.org/10.1007/s10291-015-0475-z Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83926 [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)  

Public [article]  inInside GNSS > vol 11 n° 3 (May - June 2016) 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 GPS Résumé : (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 [article]

GNSS antennas and humans: a study of their interactions / J. Bancroft in GPS world, vol 23 n° 2 (February 2012)

Public [article]  inGPS world > vol 23 n° 2 (February 2012) . - pp 60 - 66 Titre : GNSS antennas and humans: a study of their interactions Type de document : Article/Communication Auteurs : J. Bancroft, Auteur ; V. Renaudin, Auteur ; A. Morrison, Auteur ; Gérard Lachapelle, Auteur Année de publication : 2012 Article en page(s) : pp 60 - 66 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement du signal [Termes IGN] antenne GNSS [Termes IGN] propagation du signal Résumé : (Editeur) GPS is virtually ubiquitous with more than 400 milIion units estimated to be in use in the United States alone. Some of these units are standalone devices such as those used in surveying and timing applications and those used for vehicle navigation or tracking with permanent or temporary mountings. However, the majority of the units are integrated into cellular telephones, tablet computers, personal digital assistants, watches, cameras, and other devices, which are designed to operate in close contact with the human body. We even now have GPS shoes! It is well known that the performance of the antenna of a radio receiver can be affected when it is used in close proximity to the human body. So, when we use a handheld GPS receiver or wear a GPS watch, or put a GPS-equipped cellular telephone up to our ear, are there any effects on the operation of the receiver? It turns out that there are four major effects that can change the performance of a GPS (or other GNSS) receiver antenna when placed near or on the human body. [...] All these factors need to be taken into consideration when a manufacturer is designing a GPS unit to be operated in close proximity to a human body. Trade-offs might be possible and certains designs may make the antenna less likely to interact with its surroundings. But how does one go about assessing the antenna's performance in a repeatable and quantifiable way? [...] A team of researchers from the University of Calgary report n tests conducted on two different types of GPS antennas operated in the vicinity of a human phantom - an artificial body with similar electromagnetic properties as that of a real human. Numéro de notice : A2012-054 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31502 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
067-2012021	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Space-time equalization techniques for new GNSS signals / P. Anantharamu in GPS world, vol 22 n° 10 (October 2011)

Public [article]  inGPS world > vol 22 n° 10 (October 2011) . - pp 36 - 41 Titre : Space-time equalization techniques for new GNSS signals Type de document : Article/Communication Auteurs : P. Anantharamu, Auteur ; Daniele Borio, Auteur ; Gérard Lachapelle, Auteur Année de publication : 2011 Article en page(s) : pp 36 - 41 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement du signal [Termes IGN] antenne GNSS [Termes IGN] données spatiotemporelles [Termes IGN] signal GNSS [Termes IGN] traitement du signal Résumé : (Auteur) Spatial and temporal information of signals received from multiple antennas can be applied to mitigate the impact of new GPS and Galileo signal's binary-offset sub-carrier, reducing multipath and interference effects. Numéro de notice : A2011-419 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31198 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
067-2011101	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Coherent integration time limits for mobile GNSS receivers in multipath fading environments / Ali Broumandan in Inside GNSS, vol 6 n° 2 (March - April 2011)    

Public [article]  inInside GNSS > vol 6 n° 2 (March - April 2011) . - pp 62 - 65 Titre : Coherent integration time limits for mobile GNSS receivers in multipath fading environments Type de document : Article/Communication Auteurs : Ali Broumandan, Auteur ; J. Nielsen, Auteur ; Gérard Lachapelle, Auteur Année de publication : 2011 Article en page(s) : pp 62 - 65 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes IGN] navigation pédestre [Termes IGN] positionnement en intérieur [Termes IGN] récepteur GNSS [Termes IGN] signal GNSS [Termes IGN] trajet multiple Résumé : (Auteur) An emerging requirement for processing GNSS signals indoor, where signals were very weak and subject to spatial fading, has typically led receivers designers to use of longer coherent integration intervals that provide the additional processing gain required for the detection and processing of such weak signals. However, the physical motion of the handset imposed by the user limits the effectiveness of longer coherent integration intervals due to the spatial decorrelation of the multipath-faded GNSS signal. Research at the University of Calgary suggests factors that receivers designers might consider to address this problem. Numéro de notice : A2011-615 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans En ligne : http://www.insidegnss.com/node/2510 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33384 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
159-2011021	SL	Revue	Centre de documentation	Revues en salle	Disponible

Documents numériques

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Dynamic duo: combined GPS/GLONASS receivers in urban environments / Cillian O'Driscoll in GPS world, vol 22 n° 1 (January 2011)

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Spoofing detection and mitigation with a moving handheld receiver / J. Nielsen in GPS world, vol 21 n° 9 (September 2010)

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Consideration of time-correlated errors in a Kalman filter applicable to GNSS / M.G. Potovello in Journal of geodesy, vol 83 n° 1 (January 2009)  

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Mapping of river surface currents with GNSS / J. Bancroft in Geomatica, vol 62 n° 3 (September 2008)  

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Network real-time kinematic performance analysis using RTCM 3.0 and the Southern Alberta network / Kyle O'Keefe in Geomatica, vol 61 n° 1 (March 2007)  

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Pedestrian dead reckoning : a solution to navigation in GPS signal degraded areas? / O. Mezentsev in Geomatica, vol 59 n° 2 (April 2005)  

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Collocation-based multiple reference station positioning using the covariance of the corrections / P. Alves in Geomatica, vol 59 n° 1 (January 2005)  

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How will Galileo improve positioning performance ? / Gérard Lachapelle in GPS world, vol 13 n° 9 (September 2002)

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Use of a multi-reference GPS station network for precise 3D positioning in constricted waterway / Luis P. Fortes in International hydrographic Review, vol 77 n° 1 (01/07/2000)  

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Effect of ice loading of a GPS antenna / Kyle O'Keefe in Geomatica, vol 54 n° 1 (March 2000)  

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