Comptes Rendus
URSI-France 2018 Workshop: Geolocation and navigation / Journées URSI-France 2018 : Géolocalisation et navigation
Differential received power measurements over off-body links for obstruction-resilient pedestrian navigation
[Mesure différentielle de puissance reçue sur des liens radios entre corps humain et infrastructure en vue d'une navigation pédestre résiliente aux obstructions]
Comptes Rendus. Physique, Volume 20 (2019) no. 3, pp. 192-203.

On vise dans cet article à améliorer l'expérience de navigation des piétons basée sur des technologies sans fil standard à bande étroite et une métrique radio simple. La solution proposée tire profit des effets d'ombrage corporel traditionnellement observés sur les dispositifs portés sur le corps, par exemple sur des liaisons radio off-body vers les éléments fixes de l'infrastructure. L'idée principale est de déduire des informations angulaires relatives entre le cap du corps porteur et la direction du signal reçu d'arrivée. Pour ce faire, nous considérons la puissance logarithmique différentielle reçue avec des nœuds judicieusement placés sur le corps. En comparaison des contributions à l'état de l'art, il est possible de mettre en place un outil beaucoup plus léger de calibrage à la volée. La procédure d'autocalibrage est rendue possible grâce à l'autocalibrage à pleine échelle dynamique des mesures de puissance observées. Nous décrivons également un nouvel algorithme qui estime conjointement la position absolue du corps et son orientation, tout en bénéficiant de la continuité du mouvement du corps dans le temps. La solution globale est validée au moyen d'expériences sur le terrain avec des appareils conformes à la norme IEEE 802.15.4 fonctionnant à 2,4 GHz. Dans l'ensemble, le système s'est avéré résilient, non seulement contre les effets d'auto-occultation générés par les corps porteurs, mais aussi contre les obstructions occasionnelles causées par les piétons qui se déplacent dans le voisinage (par exemple dans des environnements bondés).

In this paper, we aim at improving pedestrian navigation experience based on standard narrow-band wireless technologies and simple radio metrics. The proposed solution takes benefits from body shadowing effects traditionally experienced at body-worn devices, for instance over off-body radio links with respect to fixed elements of infrastructure. The main idea is to infer relative angular information between the carrying body's heading and the received signal's direction of arrival. For this purpose, we consider differential received power measurements with judiciously placed on-body nodes. In comparison with related state-of-the-art contributions, a much lighter on-the-fly self-calibration procedure is made possible, based on the full-scale dynamics of the observed power measurements. We also describe a new algorithm that jointly estimates the body's absolute position and orientation, while benefiting from the body's movement continuity over time. The overall solution is validated by means of field experiments with IEEE 802.15.4-compliant devices operating at 2.4 GHz. Overall, the system is shown to be resilient, not only against self-shadowing effects generated by carrying bodies, but also against occasional obstructions caused by moving pedestrians in the vicinity (e.g., in crowded environments).

Publié le :
DOI : 10.1016/j.crhy.2019.03.003
Keywords: Wireless body area network, Pedestrian localization, Pedestrian navigation, Differential RSSI
Mot clés : Réseaux corporels mobiles, Goniométrie, Localisation et navigation du piéton, Mesure de puissance différentielle

Bernard Uguen 1 ; Benoît Denis 2 ; Raffaele D'Errico 2 ; Nicolas Amiot 3

1 Université de Rennes-1, IETR (UMR 6164), Campus de Beaulieu, av. du Général-Leclerc, 35042 Rennes cedex, France
2 CEA–Leti, MINATEC Campus, 17, rue des Martyrs, 38054 Grenoble cedex 9, France
3 Kerlink, 1, rue Jacqueline-Auriol, 35235 Thorigné-Fouillard, France
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Bernard Uguen; Benoît Denis; Raffaele D'Errico; Nicolas Amiot. Differential received power measurements over off-body links for obstruction-resilient pedestrian navigation. Comptes Rendus. Physique, Volume 20 (2019) no. 3, pp. 192-203. doi : 10.1016/j.crhy.2019.03.003. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2019.03.003/

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