{"id":20729,"date":"2025-10-03T21:18:00","date_gmt":"2025-10-03T21:18:00","guid":{"rendered":"https:\/\/www.calian.com\/advanced-technologies\/gnss_product\/ac4990exf-114\/"},"modified":"2026-02-26T03:39:43","modified_gmt":"2026-02-26T03:39:43","slug":"ac4990exf-114","status":"publish","type":"gnss_product","link":"https:\/\/www.calian.com\/advanced-technologies\/fr\/gnss_product\/ac4990exf-114\/","title":{"rendered":"AC4990EXF-114 Antenne GNSS de pr\u00e9cision multi-constellation int\u00e9gr\u00e9e \u00e0 bande compl\u00e8te"},"content":{"rendered":"\n

L’AC4990EXF-114 est une antenne Accutenna\u00ae 4 de pr\u00e9cision, multi-constellations et pleine bande. Les constellations et signaux pris en charge sont les suivants : GPS\/QZSS-L1\/L2\/L5 QZSS-L6, GLONASS-G1\/G2\/G3, Galileo-E1\/E5a\/E5b\/E6, BeiDou-B1\/B2\/B2a\/B3, NavIC-L5, y compris le syst\u00e8me de renforcement par satellite (SBAS) disponible dans la r\u00e9gion d’exploitation [WAAS (Am\u00e9rique du Nord), EGNOS (Europe), MSAS (Japon), ou GAGAN (Inde)], ainsi que les corrections en bande L. <\/p>\n\n

L’AC4990EXF-114 comporte un \u00e9l\u00e9ment patch empil\u00e9 \u00e0 double alimentation circulaire quadruple, accord\u00e9 avec pr\u00e9cision, avec un circuit imprim\u00e9 \u00e0 plan de masse de 114 mm de diam\u00e8tre. Les signaux des quatre alimentations orthogonales sont combin\u00e9s \u00e0 travers un r\u00e9seau d’alimentation, amplifi\u00e9s dans un LNA large bande, puis divis\u00e9s en bandes pour un filtrage \u00e9troit dans chaque bande et encore amplifi\u00e9s avant d’\u00eatre recombin\u00e9s \u00e0 la sortie. La technologie Accutenna\u00ae 4 quadruple alimentation AC4990EXF-114 permet d’obtenir un excellent rapport axial (att\u00e9nuant fortement les trajets multiples) et une variation du centre de phase \u00e9troitement group\u00e9e (\u2264 2 mm du z\u00e9nith \u00e0 15\u00b0 au-dessus de l’horizon). Elle est id\u00e9ale pour l’arpentage, le suivi et le guidage de v\u00e9hicules autonomes, l’agriculture de pr\u00e9cision et d’autres applications o\u00f9 la pr\u00e9cision compte. <\/p>\n\n

Le spectre des fr\u00e9quences radio est devenu plus encombr\u00e9 \u00e0 mesure que de nouvelles bandes LTE sont activ\u00e9es et leurs signaux ou fr\u00e9quences harmoniques [par exemple 800 MHz x 2 = 1600 MHz (GLONASS-G1)] peuvent affecter les antennes et les r\u00e9cepteurs GNSS. En Am\u00e9rique du Nord, les signaux Ligado pr\u00e9vus \u00e0 1525 – 1536 MHz peuvent avoir un impact particulier sur les antennes GNSS qui prennent en charge les corrections spatiales en bande L (1539 – 1559 MHz). Les nouveaux signaux LTE en Europe [bande 32 (1452 – 1496 MHz)] et au Japon [bandes 11 et 21 (1476 – 1511 MHz)] ont \u00e9galement \u00e9t\u00e9 observ\u00e9s comme interf\u00e9rant avec les signaux GNSS. En outre, les communications par satellite Inmarsat (liaison montante : 1626,5 – 1660,5 MHz) peuvent \u00e9galement affecter les signaux GNSS. Les nouvelles antennes Calian XF ont \u00e9t\u00e9 con\u00e7ues pour att\u00e9nuer les signaux hors bande et emp\u00eacher la saturation des antennes GNSS. Le filtrage XF personnalis\u00e9 de Calian att\u00e9nue tous les signaux existants et les nouveaux signaux Ligado et LTE, ce qui permet aux antennes et aux r\u00e9cepteurs GNSS connect\u00e9s de fonctionner de mani\u00e8re optimale. <\/p>\n\n

L’AC4990EXF-114 int\u00e9gr\u00e9 comporte huit trous de vis pour permettre un montage et une int\u00e9gration s\u00fbrs. Calian fournit une assistance pour l’installation et l’int\u00e9gration des antennes int\u00e9gr\u00e9es afin de permettre \u00e0 l’int\u00e9grateur de r\u00e9aliser une installation r\u00e9ussie et d’obtenir des performances optimales de l’antenne. <\/p>\n\n

\n
\n

Applications<\/h2>\n\n\n\n
    \n
  • Syst\u00e8mes GNSS de haute pr\u00e9cision<\/li>\n\n\n\n
  • Navigation maritime<\/li>\n\n\n\n
  • Toutes les applications de pr\u00e9cision, telles que :\n
      \n
    • Navigation de v\u00e9hicules autonomes (terre, mer, air) <\/li>\n\n\n\n
    • Agriculture de pr\u00e9cision<\/li>\n\n\n\n
    • Rover d’arpentage<\/li>\n\n\n\n
    • Syst\u00e8mes RTK\/PPP<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/div>\n\n\n\n
      \n

      Caract\u00e9ristiques<\/h2>\n\n\n\n
        \n
      • Pr\u00e9amplificateur \u00e0 tr\u00e8s faible bruit (2,5 dB typ.)<\/li>\n\n\n\n
      • Faible rapport axial (\n<\/li>\n\n\n
      • Faible variation du centre de phase (\u2264 2 mm)<\/li>\n\n\n\n
      • LNA \u00e0 gain \u00e9lev\u00e9 (30 dB typ.)<\/li>\n\n\n\n
      • Faible courant (17 mA typ.)<\/li>\n\n\n\n
      • Protection du circuit ESD (15 kV)<\/li>\n\n\n\n
      • Performance invariante de 2,5 \u00e0 16 VDC<\/li>\n<\/ul>\n<\/div>\n\n\n\n
        \n

        Avantages<\/h2>\n\n\n\n
          \n
        • Id\u00e9al pour les syst\u00e8mes d’arpentage RTK \u00e0 bande compl\u00e8te<\/li>\n\n\n\n
        • Excellente att\u00e9nuation des interf\u00e9rences<\/li>\n\n\n\n
        • Excellente r\u00e9jection des trajets multiples<\/li>\n\n\n\n
        • Pr\u00e9cision accrue du syst\u00e8me<\/li>\n\n\n\n
        • Excellent rapport signal\/bruit<\/li>\n\n\n\n
        • Conforme aux normes CE RED, RoHS et REACH<\/li>\n<\/ul>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

          L’AC4990EXF-114 est une antenne Accutenna\u00ae 4 de pr\u00e9cision, multi-constellations et pleine bande. Les constellations et signaux pris en charge sont les suivants : GPS\/QZSS-L1\/L2\/L5 QZSS-L6, GLONASS-G1\/G2\/G3, Galileo-E1\/E5a\/E5b\/E6, BeiDou-B1\/B2\/B2a\/B3, NavIC-L5, y compris le syst\u00e8me de renforcement par satellite (SBAS) disponible dans la r\u00e9gion d’exploitation [WAAS (Am\u00e9rique du Nord), EGNOS (Europe), MSAS (Japon), ou GAGAN (Inde)], ainsi que les corrections en …<\/p>\n","protected":false},"featured_media":19793,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":""},"post_tag":[],"gnss_category":[332],"gnss_industry":[319,320,323,321,318],"product_type":[167],"mount_type":[168],"class_list":["post-20729","gnss_product","type-gnss_product","status-publish","has-post-thumbnail","hentry","gnss_category-produits","gnss_industry-agriculture-de-precision","gnss_industry-application-de-la-loi-et-securite-publique","gnss_industry-marine-fr","gnss_industry-positionnement-gnss-de-precision","gnss_industry-vehicules-autonomes","product_type-antennes","mount_type-oem-embarque"],"acf":[],"yoast_head":"\nAC4990EXF-114 Antenne GNSS de pr\u00e9cision multi-constellation int\u00e9gr\u00e9e \u00e0 bande compl\u00e8te - Calian Space (GNSS)<\/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:\/\/www.calian.com\/advanced-technologies\/fr\/gnss_product\/ac4990exf-114\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"AC4990EXF-114 Antenne GNSS de pr\u00e9cision multi-constellation int\u00e9gr\u00e9e \u00e0 bande compl\u00e8te - Calian Space (GNSS)\" \/>\n<meta property=\"og:description\" content=\"L’AC4990EXF-114 est une antenne Accutenna\u00ae 4 de pr\u00e9cision, multi-constellations et pleine bande. 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