{"id":3321,"date":"2026-02-19T10:59:40","date_gmt":"2026-02-19T09:59:40","guid":{"rendered":"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/?post_type=glossary&#038;p=3321"},"modified":"2026-02-19T10:59:40","modified_gmt":"2026-02-19T09:59:40","slug":"active-system","status":"publish","type":"glossary","link":"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/fr\/glossary\/active-system\/","title":{"rendered":"active system"},"content":{"rendered":"<p>(active <a class=\"glossaryLink\" title=\"Glossary: sensor\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;sensor&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Device producing an output in response to incident radiation. Sensors aboard satellites obtain information about features and objects on Earth by detecting radiation reflected or emitted in different bands of the electromagnetic spectrum.&lt;\/div&gt;\" href=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/fr\/glossary\/sensor\/\" target=\"_blank\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">sensor<\/a>) A remote-sensing system that transmits its own <a class=\"glossaryLink\" title=\"Glossary: radiation\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;radiation&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Energy transfer in the form of electromagnetic waves or particles that release energy when absorbed by an object.&lt;\/div&gt;\" href=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/fr\/glossary\/radiation\/\" target=\"_blank\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">radiation<\/a> to detect an object or area for observation and receives the reflected or transmitted radiation. Example: Radar.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>(active sensor) A remote-sensing system that transmits its own radiation to detect an object or area for observation and receives the reflected or transmitted radiation. Example: Radar.<\/p>\n","protected":false},"author":2,"featured_media":0,"menu_order":0,"template":"","meta":{"footnotes":""},"class_list":["post-3321","glossary","type-glossary","status-publish","hentry"],"translation":{"provider":"WPGlobus","version":"3.0.0","language":"fr","enabled_languages":["en","es","de","fr","it"],"languages":{"en":{"title":true,"content":true,"excerpt":false},"es":{"title":false,"content":false,"excerpt":false},"de":{"title":false,"content":false,"excerpt":false},"fr":{"title":false,"content":false,"excerpt":false},"it":{"title":false,"content":false,"excerpt":false}}},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>active system - ESA Schoolatlas<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/fr\/glossary\/active-system\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"active system - 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