{"id":56702,"date":"2017-09-19T19:02:43","date_gmt":"2017-09-19T18:02:43","guid":{"rendered":"http:\/\/www.wanarun.net\/blog\/?p=56702"},"modified":"2017-09-19T19:02:43","modified_gmt":"2017-09-19T18:02:43","slug":"lhistoire-du-gps","status":"publish","type":"post","link":"https:\/\/www.wanarun.net\/blog\/lhistoire-du-gps-56702.html","title":{"rendered":"L&rsquo;histoire du GPS"},"content":{"rendered":"<p><a href=\"https:\/\/www.wanarun.net\/blog\/wp-content\/uploads\/2017\/09\/histoire-gps.jpg\"><img loading=\"lazy\" class=\"alignleft size-thumbnail wp-image-56722\" src=\"https:\/\/www.wanarun.net\/blog\/wp-content\/uploads\/2017\/09\/histoire-gps-150x150.jpg\" alt=\"\" width=\"150\" height=\"150\" srcset=\"https:\/\/www.wanarun.net\/blog\/wp-content\/uploads\/2017\/09\/histoire-gps-150x150.jpg 150w, https:\/\/www.wanarun.net\/blog\/wp-content\/uploads\/2017\/09\/histoire-gps-100x100.jpg 100w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/><\/a>Si il y a bien un outil qui a boulevers\u00e9 notre quotidien depuis une quinzaine c&rsquo;est bien le GPS. En effet vous \u00eates des millions en France \u00e0 avoir une montre utilisant cette technologie et je ne compte m\u00eame pas les smartphones. Une technologie qui a compl\u00e8tement boulevers\u00e9 notre fa\u00e7on de nous d\u00e9placer ou de nous entrainer. Comment une invention du pentagone est devenu indispensable \u00e0 des milliards de personnes ?<\/p>\n<p>Le syst\u00e8me est simple et complexe \u00e0 la fois, il faut pas moins de 24 satellites qui survolent la terre en permanence \u00e0 une altitude de 20200 km. En fait, il y en a en tout 28 car il y a 4 satellites de r\u00e9serve. 10 ans apr\u00e8s le lancement du projet par Nixon, en 1978, le premier satellite est lanc\u00e9.\u00a0 C&rsquo;est seulement en 1995 que le syst\u00e8me est enfin op\u00e9rationnel.<\/p>\n<p>Les satellites envoient en permanence des ondes UHF en permanence en direction de la terre avec des modulations de phases.<\/p>\n<p>Alors que cette technologie est pr\u00e9vue pour un usage militaire, le crash d&rsquo;un avion, qui fit 269 morts, montre les probl\u00e8mes de positionnement des avions. En effet, suite \u00e0 une erreur, le vol s&rsquo;est retrouv\u00e9 sur une zone interdite en union sovi\u00e9tique et fut abattu par un avion de chasse sovi\u00e9tique. A la suite de cet \u00e9v\u00e9nement malheureux en 1983, Ronald Reagan (Alors actuellement pr\u00e9sident des etats-unis) propose d&rsquo;ouvrir la technologique au public quand elle sera op\u00e9rationnelle.<\/p>\n<p>C&rsquo;est finalement en 2000 que le pr\u00e9sident Bill Clinton lib\u00e9ralise l&rsquo;utilisation des ondes GPS.<\/p>\n<p>Il est difficile de lister l&rsquo;ensemble des domaines d&rsquo;utilisation de la technologie GPS mais dans le sport, en course \u00e0 pied, en cyclisme, en voile,&#8230; Elle a su se rendre indispensable.<\/p>\n<p>Et vous vous\u00a0vivriez\u00a0sans GPS ?<\/p>\n","protected":false},"excerpt":{"rendered":"<a href=\"https:\/\/www.wanarun.net\/blog\/lhistoire-du-gps-56702.html\"><img width=\"150\" height=\"150\" src=\"https:\/\/www.wanarun.net\/blog\/wp-content\/uploads\/2017\/09\/histoire-gps-150x150.jpg\" class=\"alignleft tfe wp-post-image\" alt=\"\" loading=\"lazy\" srcset=\"https:\/\/www.wanarun.net\/blog\/wp-content\/uploads\/2017\/09\/histoire-gps-150x150.jpg 150w, https:\/\/www.wanarun.net\/blog\/wp-content\/uploads\/2017\/09\/histoire-gps-100x100.jpg 100w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/><\/a><p>Si il y a bien un outil qui a boulevers\u00e9 notre quotidien depuis une quinzaine c&rsquo;est bien le GPS. En effet vous \u00eates des millions en France \u00e0 avoir une montre utilisant cette technologie et je ne compte m\u00eame pas les smartphones. Une technologie qui a compl\u00e8tement boulevers\u00e9 notre fa\u00e7on de nous d\u00e9placer ou de [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":56722,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[4],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>L&#039;histoire du GPS<\/title>\n<meta name=\"description\" content=\"Si il y a bien un outil qui a boulevers\u00e9 notre quotidien depuis une quinzaine c&#039;est bien le GPS. 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