{"id":94896,"date":"2019-02-18T14:40:17","date_gmt":"2019-02-18T14:40:17","guid":{"rendered":"https:\/\/\/un-chip-radar-a-240ghz-voit-dans-le-brouillard-et-la-poussiere\/"},"modified":"2019-02-18T14:40:17","modified_gmt":"2019-02-18T14:40:17","slug":"un-chip-radar-a-240ghz-voit-dans-le-brouillard-et-la-poussiere","status":"publish","type":"post","link":"https:\/\/www.ecinews.fr\/fr\/un-chip-radar-a-240ghz-voit-dans-le-brouillard-et-la-poussiere\/","title":{"rendered":"Un chip radar \u00e0 240GHz voit dans le brouillard et la poussi\u00e8re"},"content":{"rendered":"

Un peu comme pour le principe de fonctionnement de l\u2019imagerie LiDAR, les ondes sub-terahertz sont r\u00e9fl\u00e9chies par les objets et les signaux renvoy\u00e9s peuvent ensuite \u00eatre d\u00e9tect\u00e9s et trait\u00e9s pour la d\u00e9tection et la cartographie d\u2019objets. La diff\u00e9rence \u00e9tant que les longueurs d’ondes inf\u00e9rieures au t\u00e9rahertz (entre les rayonnements micro-ondes et infrarouges) peuvent \u00eatre facilement d\u00e9tect\u00e9es \u00e0 travers des nuages \u200b\u200bde brouillard et de poussi\u00e8re, alors que de telles conditions dispersent le signal infrarouge \u00e9mis par les LiDARs.<\/span><\/p>\n

Dans un article intitul\u00e9 \u00abUn r\u00e9seau de r\u00e9cepteurs h\u00e9t\u00e9rodynes de 32 GHz \u00e0 240 GHz en CMOS 65 nm avec  \u00ab\u00a0<\/span>Array-Wide Phase Locking\u00bb, publi\u00e9 dans le journal IEEE Journal of Solid-State Circuits, les chercheurs rapportent l’int\u00e9gration de deux syst\u00e8mes r\u00e9cepteurs h\u00e9t\u00e9rodynes 4×4 bloqu\u00e9s en phase dans une zone de la puce de 1,2 mm\u00b2, permettant le pilotage simultan\u00e9 de deux faisceaux ind\u00e9pendants.<\/span><\/p>\n

Sur la base de leurs mesures, la sensibilit\u00e9 (\u00e0 une largeur de bande de 1 kHz) d\u2019une seule unit\u00e9 \u00e9tait de 58fW, offrant une am\u00e9lioration de la sensibilit\u00e9 de 4300x pour la d\u00e9tection sensible \u00e0 la phase. Le document conclut que de plus grands r\u00e9seaux de d\u00e9tection pourraient \u00eatre con\u00e7us simplement en mettant en mosa\u00efque plus de r\u00e9cepteurs tout en permettant une conception tr\u00e8s compacte.<\/span><\/p>\n

\u00ab\u00a0Une grande motivation pour ce travail est d’avoir de meilleurs\u00a0\u00bb yeux \u00e9lectriques \u00ab\u00a0pour les v\u00e9hicules autonomes et les drones\u00a0\u00bb, a expliqu\u00e9 le co-auteur Ruonan Han, professeur agr\u00e9g\u00e9 en g\u00e9nie \u00e9lectrique et en informatique, et directeur du groupe Terahertz Integrated Electronics au sein du MIT Microsystems. Laboratoires de technologie (MTL). \u00abNos capteurs sub-terahertz sur puce, \u00e0 faible co\u00fbt, joueront un r\u00f4le compl\u00e9mentaire \u00e0 LiDAR dans les environnements difficiles.\u00bb<\/span><\/p>\n

\u00e0 suivre: du pixel \u00e0 la reconnaissance d’objets<\/p>\n

\n

La cl\u00e9 de la conception r\u00e9side dans ce que les chercheurs appellent la \u00abd\u00e9centralisation\u00bb. Dans cette conception, un seul pixel, appel\u00e9 pixel \u00abh\u00e9t\u00e9rodyne\u00bb, g\u00e9n\u00e8re le battement de fr\u00e9quence (diff\u00e9rence de fr\u00e9quence entre deux signaux sous-t\u00e9rahertz entrants) et l\u2019oscillateur local<\/span> , \u00ab\u00a0Un signal \u00e9lectrique qui modifie la fr\u00e9quence d’une fr\u00e9quence d’entr\u00e9e.<\/span> Ce processus de \u00abmixage en aval\u00bb produit un signal dans la plage des m\u00e9gahertz qui peut \u00eatre facilement interpr\u00e9t\u00e9 par un processeur en bande de base.<\/span><\/span><\/p>\n

Le signal de sortie peut \u00eatre utilis\u00e9 pour calculer la distance des objets, de la m\u00eame mani\u00e8re que la technologie LiDAR calcule le temps n\u00e9cessaire au laser pour frapper un objet et rebondir.<\/span> De plus, la combinaison des signaux de sortie d’une matrice de pixels et l’orientation des pixels dans une certaine direction peuvent permettre d’obtenir des images haute r\u00e9solution d’une sc\u00e8ne.<\/span> Cela permet non seulement la d\u00e9tection, mais \u00e9galement la reconnaissance d’objets, ce qui est essentiel pour les v\u00e9hicules autonomes et les robots.<\/span><\/span><\/p>\n

\u00e0 lire \u00e9galement:     <\/p>\n

Ricoh annonce un partenariat strat\u00e9gique avec IEE<\/a><\/p>\n

NXP et Kalray veulent fournir une solution s\u00fbre et fiable pour les v\u00e9hicules autonomes<\/a><\/p>\n

MIT \u2013 www.mit.edu<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Researchers from MIT have leveraged the unique propagation properties of sub-terahertz wavelengths to design a sensor chip able to detect objects hidden by fog or dust.<\/p>\n","protected":false},"author":22,"featured_media":94897,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[883],"tags":[889,916],"domains":[47],"ppma_author":[1149],"class_list":["post-94896","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technologies","tag-analog-fr","tag-rf-transmission-fr","domains-electronique-eci"],"acf":[],"yoast_head":"Un chip radar \u00e0 240GHz voit dans le brouillard et la poussi\u00e8re ...<\/title>\n<meta name=\"description\" content=\"Researchers from MIT have leveraged the unique propagation properties of sub-terahertz wavelengths to design a sensor chip able to detect objects hidden by...\" \/>\n<meta name=\"robots\" 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