<\/p>\n
INTRODUCTION<\/p>\n
On d\u00e9signe par RADAR (contraction de l\u2019expression anglaise \u00ab\u00a0Radio Detection And Ranging\u00a0\u00bb un syst\u00e8me dont le but est de d\u00e9tecte et d\u00e9terminer la position de cibles \u00e0 l\u2019aide d\u2019ondes \u00e9lectromagn\u00e9tiques.<\/em><\/span><\/p>\n Historique\u00a0:<\/em><\/span><\/p>\n D\u00e8s 1887, Hertz d\u00e9couvrit que les ondes \u00ab\u00a0radio\u00a0\u00bb pouvaient \u00eatre concentr\u00e9es et r\u00e9fl\u00e9chies par des surfaces m\u00e9talliques. De 1920 \u00e0 1930, plusieurs chercheurs (aux USA, en France, en Grande-Bretagne et en Allemagne) d\u00e9montr\u00e8rent qu\u2019il \u00e9tait possible, par ce moyen de d\u00e9tection des objets tels que des avions ou des bateaux \u00e0 plusieurs kilom\u00e8tres de distance.<\/em><\/span><\/p>\n A partir de 1930, les recherches s\u2019acc\u00e9l\u00e8rent en visant surtout des applications militaires. Au d\u00e9clenchement de la seconde guerre mondiale elles venaient de d\u00e9boucher sur le RADAR. Les premiers \u00e9quipements fonctionn\u00e8rent \u00e0 l\u2019aide d\u2019ondes m\u00e9triques puis centim\u00e9triques par \u00e9mission de signaux sous forme d\u2019impulsions de fortes puissances rendues possibles par l\u2019invention du magn\u00e9tron.<\/em><\/span><\/p>\n Le r\u00f4le de ces \u00e9quipements fut tr\u00e8s important d\u00e8s 1940. Depuis 1945, des applications civiles sont apparues et n\u2019ont cess\u00e9 de se d\u00e9velopper pour les transports a\u00e9riens, maritimes, l\u2019astronomie, la m\u00e9t\u00e9orologie \u2026<\/em><\/span><\/p>\n Lire la suite …<\/a><\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":" INTRODUCTION On d\u00e9signe par RADAR (contraction de l\u2019expression anglaise \u00ab\u00a0Radio Detection And Ranging\u00a0\u00bb un syst\u00e8me dont le but est de d\u00e9tecte et d\u00e9terminer la position de cibles \u00e0 l\u2019aide d\u2019ondes \u00e9lectromagn\u00e9tiques. Historique\u00a0: D\u00e8s 1887, Hertz d\u00e9couvrit que les ondes \u00ab\u00a0radio\u00a0\u00bb pouvaient \u00eatre concentr\u00e9es et r\u00e9fl\u00e9chies par des surfaces m\u00e9talliques. De 1920 \u00e0 1930, plusieurs … Continuer la lecture de « Plaquette radar – 1982 »<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","footnotes":""},"categories":[37,96],"tags":[],"class_list":["post-8219","post","type-post","status-publish","format-standard","hentry","category-actu","category-instruments"],"_links":{"self":[{"href":"https:\/\/anciensmeteos.info\/index.php?rest_route=\/wp\/v2\/posts\/8219","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/anciensmeteos.info\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/anciensmeteos.info\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/anciensmeteos.info\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/anciensmeteos.info\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=8219"}],"version-history":[{"count":0,"href":"https:\/\/anciensmeteos.info\/index.php?rest_route=\/wp\/v2\/posts\/8219\/revisions"}],"wp:attachment":[{"href":"https:\/\/anciensmeteos.info\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=8219"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/anciensmeteos.info\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=8219"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/anciensmeteos.info\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=8219"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}