{"id":167335,"date":"2017-07-06T03:50:29","date_gmt":"2017-07-06T03:50:29","guid":{"rendered":"https:\/\/eenewseurope.artwhere.co\/les-drones-equipes-de-wi-fi-extraient-des-cartes-3d-a-travers-les-murs\/"},"modified":"2017-07-06T03:50:29","modified_gmt":"2017-07-06T03:50:29","slug":"les-drones-equipes-de-wi-fi-extraient-des-cartes-3d-a-travers-les-murs","status":"publish","type":"post","link":"https:\/\/www.ecinews.fr\/fr\/les-drones-equipes-de-wi-fi-extraient-des-cartes-3d-a-travers-les-murs\/","title":{"rendered":"Les drones \u00e9quip\u00e9s de Wi-Fi extraient des cartes 3D \u00e0 travers les murs"},"content":{"rendered":"

Une telle imagerie 3D \u00e0 travers le mur serait tr\u00e8s utile dans les sc\u00e9narios de catastrophe pour les missions de recherche et de sauvetage, ou pour les op\u00e9rations de surveillance.<\/p>\n

Dans leur article intitul\u00e9 \u00ab3D Through-Wall Imaging with Unmanned Aerial Vehicles Using WiFi\u00bb, les chercheurs notent que pour ce type d’application, bien que l’imagerie sur les mesures RSSI de WiFi ait d\u00e9j\u00e0 \u00e9t\u00e9 d\u00e9montr\u00e9e avec succ\u00e8s en 2D en utilisant des v\u00e9hicules terrestres non habit\u00e9s (mais ne produisant qu’une empreinte 2D ), passer \u00e0 la troisi\u00e8me dimension \u00e9tait beaucoup plus difficile, en particulier avec la contrainte d’estimer rapidement un nombre \u00e9lev\u00e9 de volumes \u00e0 partir d’un relativement petit nombre de mesures.<\/p>\n

Dans les situations de recherche et de sauvetage, le temps est essentiel, limitant ainsi le nombre de trajets de mesure et rendant la reconstruction 3D plus difficile en fonction de la fa\u00e7on dont le signal WiFi est affect\u00e9 par les obstacles dans la zone inconnue.<\/p>\n

\n
\"\"
(\u00c0 gauche) Une construction en brique en forme de L mesurant 2,96×2,96×0,5 m, (au milieu) son image 3D binaire en vrac et (\u00e0 droite) l’image binaire 3D reconstruit bas\u00e9e sur les mesures RSSI.<\/figcaption><\/figure>\n<\/div>\n

Les chercheurs ont r\u00e9solu ce probl\u00e8me en utilisant la mod\u00e9lisation du champ al\u00e9atoire de Markov (MRF), la propagation des croyances en boucle et le traitement du signal sparse, ainsi qu’une planification optimis\u00e9e des voies pour piloter les drones (deux octocopters) le long des routes en 3D en zigzagant de chaque c\u00f4t\u00e9 du mur.<\/p>\n

Avec leurs exp\u00e9riences, les chercheurs ont d\u00e9montr\u00e9 comment ils pouvaient obtenir des images de haute qualit\u00e9 \u00e0 travers le mur sur diff\u00e9rentes configurations d’essai constitu\u00e9es de parois en briques \u00e9paisses, avec moins de 4% des mesures.<\/p>\n

Universit\u00e9 de Santa Barbara  – Californie – www.ucsb.edu<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Dans un article r\u00e9cent pr\u00e9sent\u00e9 lors de la derni\u00e8re conf\u00e9rence internationale ACM \/ IEEE sur le traitement de l’information (IPSN), des chercheurs de l’Universit\u00e9 de Santa Barbara en Californie ont montr\u00e9 comment utiliser deux drones volant en tandem, l’un portant un \u00e9metteur WiFi et l’autre un r\u00e9cepteur WiFi, afin de reconstruire efficacement une image 3D d’une zone mur\u00e9e ou occlusive, en se basant uniquement sur les mesures de l’indicateur de r\u00e9sistance au signal re\u00e7u (RSSI) du WiFi.<\/p>\n","protected":false},"author":11,"featured_media":167336,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[883],"tags":[],"domains":[47],"ppma_author":[1143],"class_list":["post-167335","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technologies","domains-electronique-eci"],"acf":[],"yoast_head":"Les drones \u00e9quip\u00e9s de Wi-Fi extraient des cartes 3D \u00e0 traver...<\/title>\n<meta name=\"description\" content=\"Dans un article r\u00e9cent pr\u00e9sent\u00e9 lors de la derni\u00e8re conf\u00e9rence internationale ACM \/ IEEE sur le traitement de l'information (IPSN), des chercheurs de...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ecinews.fr\/fr\/wp-json\/wp\/v2\/posts\/167335\/\" \/>\n<meta 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