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Urban Wi-Fi fingerprinting along a public transport route / Guenther Retscher in Journal of applied geodesy, vol 14 n° 4 (October 2020)
[article]
Titre : Urban Wi-Fi fingerprinting along a public transport route Type de document : Article/Communication Auteurs : Guenther Retscher, Auteur ; Aizhan Bekenova, Auteur Année de publication : 2020 Article en page(s) : pp 379 – 392 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] accès sans fils à l'internet
[Termes IGN] cartographie et localisation simultanées
[Termes IGN] centrale inertielle
[Termes IGN] empreinte
[Termes IGN] itinéraire
[Termes IGN] migration pendulaire
[Termes IGN] positionnement par WiFi
[Termes IGN] programmation par contraintes
[Termes IGN] qualité du signal
[Termes IGN] service fondé sur la position
[Termes IGN] téléphone intelligent
[Termes IGN] transport collectif
[Termes IGN] zone urbaineRésumé : (auteur) The outreach of Wi-Fi localization is extended in this study for urban wide applications as they provide the high potential to employ them for numerous applications for localization and guidance in urban environments. The selected application presented in this paper is the localization and routing of public transport smartphone users. For the conducted investigations, Received Signal Strength Indicator (RSSI) values are collected for users who are travelling from home in a residential neighbourhood to work in the city centre and return along the same route. Special tramway trains are selected which provide two on-board Wi-Fi Access Points (APs). Firstly, the availability, visibility and RSSI stability of the Wi-Fi signal behavior of these APs and the APs in the surrounding environment along the routes is analyzed. Then the trajectories are estimated based on location fingerprinting. A first analyses reveals that significant differences exists between the six employed smartphones as well as times of the day, e. g. in the morning at peak hours or at off-peak hours. From the long-time observations it is seen that the two on-board APs show a high stability of the RSSI signals at the same times of the day and along the whole route. It is therefore currently investigated how they can confirm and validate user localization along the route and if they can contribute to constrain the overall positioning solution in combination with the inertial smartphone sensors. Moreover, the railway track can serve as a further constraint. As an outlook on future work, the development of a Simultaneous Localization and Mapping (SLAM) solution with a fusion with the smartphone inertial sensors is proposed. Numéro de notice : A2020-676 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT/URBANISME Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1515/jag-2020-0015 Date de publication en ligne : 16/07/2020 En ligne : https://doi.org/10.1515/jag-2020-0015 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=96168
in Journal of applied geodesy > vol 14 n° 4 (October 2020) . - pp 379 – 392[article]Trilateration approaches for seamless out-/indoor GNSS and Wi-Fi smartphone positioning / Guenther Retscher in Journal of applied geodesy, vol 13 n° 1 (January 2019)
[article]
Titre : Trilateration approaches for seamless out-/indoor GNSS and Wi-Fi smartphone positioning Type de document : Article/Communication Auteurs : Guenther Retscher, Auteur ; Jonathan Kleine, Auteur ; Lisa Whitemore, Auteur Année de publication : 2019 Article en page(s) : pp 47 - 61 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] géolocalisation
[Termes IGN] positionnement en intérieur
[Termes IGN] positionnement par WiFi
[Termes IGN] téléphone intelligent
[Termes IGN] test de performance
[Termes IGN] trilatérationRésumé : (Auteur) More and more sensors and receivers are found nowadays in smartphones which can enable and improve positioning for Location-based Services and other navigation applications. Apart from inertial sensors, such as accelerometers, gyroscope and magnetometer, receivers for Wireless Fidelity (Wi-Fi) and GNSS signals can be employed for positioning of a mobile user. In this study, three trilateration methods for Wi-Fi positioning are investigated whereby the influence of the derivation of the relationship between the received signal strength (RSS) and the range to an Access Points (AP) are analyzed. The first approach is a straightforward resection for point determination and the second is based on the calculation of the center of gravity in a triangle of APs while weighting the received RSS. In the third method a differential approach is employed where as in Differential GNSS (DGNSS) corrections are derived and applied to the raw RSS measurements. In this Differential Wi-Fi (DWi-Fi) method, reference stations realized by low-cost Raspberry Pi units are used to model temporal RSS variations. In the experiments in this study two different indoor environments are used, one in a laboratory and the second in the entrance of an office building. The results of the second and third approach show position deviations from the ground truth of around 2 m in dependence of the geometrical point location. Furthermore, the transition between GNSS positioning outdoors and Wi-Fi localization indoors in the entrance area of the building is studied. Numéro de notice : A2019-134 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1515/jag-2018-0022 Date de publication en ligne : 19/10/2018 En ligne : https://doi.org/10.1515/jag-2018-0022 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=92464
in Journal of applied geodesy > vol 13 n° 1 (January 2019) . - pp 47 - 61[article]Indoor positioning using differential Wi-Fi lateration / Guenther Retscher in Journal of applied geodesy, vol 11 n° 4 (December 2017)
[article]
Titre : Indoor positioning using differential Wi-Fi lateration Type de document : Article/Communication Auteurs : Guenther Retscher, Auteur ; Thomas Tatschl, Auteur Année de publication : 2017 Article en page(s) : pp 249 - 269 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] appareil portable
[Termes IGN] multilatération
[Termes IGN] positionnement en intérieur
[Termes IGN] positionnement par WiFiRésumé : (Auteur) For Wi-Fi positioning usually location fingerprinting or (tri)lateration are employed whereby the received signal strengths (RSSs) of the surrounding Wi-Fi Access Points (APs) are scanned on the mobile devices and used to perform localization. Within the scope of this study, the position of a mobile user is determined on the basis of lateration. Two new differential approaches are developed and compared to two common models, i.e., the one-slope and multi-wall model, for the conversion of the measured RSS of the Wi-Fi signals into ranges. The two novel methods are termed DWi-Fi as they are derived either from the well-known DGPS or VLBI positioning principles. They make use of a network of reference stations deployed in the area of interest. From continuous RSS observations on these reference stations correction parameters are derived and applied by the user in real-time. This approach leads to a reduced influence of temporal and spatial variations and various propagation effects on the positioning result. In practical use cases conducted in a multi-storey office building with three different smartphones, it is proven that the two DWi-Fi approaches outperform the common models as static positioning yielded to position errors of about 5 m in average under good spatial conditions. Numéro de notice : A2017-791 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1515/jag-2017-0011 En ligne : https://doi.org/10.1515/jag-2017-0011 Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89063
in Journal of applied geodesy > vol 11 n° 4 (December 2017) . - pp 249 - 269[article]A la recherche du point bleu / Françoise de Blomac in DécryptaGéo le mag, n° 168 (juin 2015)
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Titre : A la recherche du point bleu Type de document : Article/Communication Auteurs : Françoise de Blomac, Auteur Année de publication : 2015 Article en page(s) : pp 10 - 11 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] Bluetooth
[Termes IGN] guidage
[Termes IGN] navigation pédestre
[Termes IGN] positionnement en intérieur
[Termes IGN] positionnement par WiFi
[Termes IGN] robot mobile
[Termes IGN] service fondé sur la position
[Termes IGN] téléphonie mobileRésumé : (auteur) Quelles techniques pour se substituer au GPS ? Chaque année apporte son lot d'idées et de prototypes. Pseudo GPS, Wifi, Lifi, Mems... Les acronymes pleuvent mais localiser précisément un appareil mobile tel un smartphone reste affaire de compromis et de mixage. Numéro de notice : A2015-021 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76454
in DécryptaGéo le mag > n° 168 (juin 2015) . - pp 10 - 11[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 286-2015061 RAB Revue Centre de documentation En réserve L003 Disponible Exploring mobility indoors : an application of sensor-based and GIS systems / Anastasia Petrenko in Transactions in GIS, vol 18 n° 3 (June 2014)
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Titre : Exploring mobility indoors : an application of sensor-based and GIS systems Type de document : Article/Communication Auteurs : Anastasia Petrenko, Auteur ; Anton Sizo, Auteur ; Winchel Qian, Auteur ; A.dylan Knowles, Auteur ; Amin Tavassolian, Auteur ; Kevin Stanley, Auteur ; Scott Bell, Auteur Année de publication : 2014 Article en page(s) : pp 351 - 369 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] mobilité urbaine
[Termes IGN] portage
[Termes IGN] positionnement en intérieur
[Termes IGN] positionnement par WiFi
[Termes IGN] réseau de capteurs
[Termes IGN] système d'information géographiqueRésumé : (Auteur) The popularization of tracking devices, such as GPS, accelerometers and smartphones, have made it possible to detect, record, and analyze new patterns of human movement and behavior. However, employing GPS alone for indoor localization is not always possible due to the system's inability to determine location inside buildings or in places of signal occlusion. In this context, the application of local wireless networks for determining position is a promising alternative solution, although they still suffer from a number of limitations due to energy and IT-resources. Our research outlines the potential for employing indoor wireless network positioning and sensor-based systems to improve the collection of tracking data indoors. By applying various methods of GIScience, we developed a methodology that can be applicable for diverse human indoor mobility analysis. To show the advantage of the proposed method, we present the result of an experiment that included mobility analysis of 37 participants. We tracked their movements on a university campus over the course of 41 days and demonstrated that their movement behavior can be successfully studied with our proposed method. Numéro de notice : A2014-272 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT/SOCIETE NUMERIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12102 Date de publication en ligne : 13/06/2014 En ligne : https://doi.org/10.1111/tgis.12102 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33175
in Transactions in GIS > vol 18 n° 3 (June 2014) . - pp 351 - 369[article]L'autre monde de la géolocalisation : "l'indoors" / Françoise de Blomac in SIG la lettre, n° 119 (septembre 2010)PermalinkCoherent integration time : the longer, the better / T. Pany in Inside GNSS, vol 4 n° 6 (November - December 2009)PermalinkPermalinkWireless campus LBS: a test bed for WiFi positioning and location based services / B. Kobben in Cartography and Geographic Information Science, vol 34 n° 4 (October 2007)Permalink