{"id":8658,"date":"2023-07-26T12:55:37","date_gmt":"2023-07-26T10:55:37","guid":{"rendered":"https:\/\/guide-gnss.com\/?page_id=8658"},"modified":"2024-04-11T15:21:25","modified_gmt":"2024-04-11T13:21:25","slug":"carte-gnss","status":"publish","type":"page","link":"https:\/\/guide-gnss.com\/fr\/carte-gnss\/","title":{"rendered":"Cartes GNSS"},"content":{"rendered":"<p>[et_pb_section fb_built=\u00a0\u00bb1&Prime; fullwidth=\u00a0\u00bbon\u00a0\u00bb _builder_version=\u00a0\u00bb4.16&Prime; saved_tabs=\u00a0\u00bball\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_fullwidth_header title=\u00a0\u00bbCartes GNSS\u00a0\u00bb _builder_version=\u00a0\u00bb4.16&Prime; title_font=\u00a0\u00bbMontserrat|700|||||||\u00a0\u00bb title_text_align=\u00a0\u00bbcenter\u00a0\u00bb title_font_size=\u00a0\u00bb32px\u00a0\u00bb title_letter_spacing=\u00a0\u00bb3px\u00a0\u00bb subhead_font=\u00a0\u00bbMontserrat|600|||||||\u00a0\u00bb subhead_text_align=\u00a0\u00bbcenter\u00a0\u00bb subhead_font_size=\u00a0\u00bb20px\u00a0\u00bb use_background_color_gradient=\u00a0\u00bbon\u00a0\u00bb background_color_gradient_stops=\u00a0\u00bb#375882 0%|#4370a0 100%\u00a0\u00bb background_color_gradient_start=\u00a0\u00bb#375882&Prime; background_color_gradient_end=\u00a0\u00bb#4370a0&Prime; custom_padding=\u00a0\u00bb||27px|||\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb]<\/p>\n<p style=\"text-align: center;\"><strong>Cartographie des perturbations GNSS dans l\u2019environnement local<\/strong><\/p>\n<p>[\/et_pb_fullwidth_header][\/et_pb_section][et_pb_section fb_built=\u00a0\u00bb1&Prime; _builder_version=\u00a0\u00bb4.16&Prime; custom_padding=\u00a0\u00bb5px||50px||false|false\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_row column_structure=\u00a0\u00bb1_2,1_2&Prime; _builder_version=\u00a0\u00bb4.16&Prime; custom_margin=\u00a0\u00bb40px|auto||auto||\u00a0\u00bb custom_padding=\u00a0\u00bb0px||20px||false|false\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_column type=\u00a0\u00bb1_2&Prime; _builder_version=\u00a0\u00bb4.16&Prime; global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_text _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb custom_padding=\u00a0\u00bb0px|||||\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb]<\/p>\n<h2>Qu&rsquo;est-ce qu&rsquo;une carte gnss?<\/h2>\n<p style=\"text-align: justify;\">Les cartes GNSS, qu\u2019elles soient d\u00e9volues aux applications routi\u00e8res, urbaines ou encore ferroviaires, ont pour objectif de d\u00e9terminer la pr\u00e9disposition des terminaux GNSS \u00e0 \u00eatre g\u00e9olocalis\u00e9s sur leurs trajets, c\u2019est-\u00e0-dire leur capacit\u00e9 \u00e0 se positionner avec pr\u00e9cision \u00e0 chaque instant.<\/p>\n<p style=\"text-align: justify;\">Les signaux satellitaires (GNSS) sont plus ou moins perturb\u00e9s par l\u2019environnement local. Les ponts, les reliefs, les canop\u00e9es, les b\u00e2timents et autres infrastructures impactent la propagation des ondes radiofr\u00e9quences. Ainsi, selon le lieu et la technologie du terminal GNSS, les erreurs sur les positions sont tr\u00e8s variables.<\/p>\n<p style=\"text-align: justify;\">Les erreurs GNSS sont souvent d\u00e9concertantes pour les utilisateurs, m\u00eame avertis. Elles se d\u00e9composent en deux familles selon les ph\u00e9nom\u00e8nes de propagation rencontr\u00e9s. Les pertes de pr\u00e9cision caus\u00e9es par l\u2019environnement local se manifestent par des \u00e9carts de mesures principalement al\u00e9atoires par rapport \u00e0 la r\u00e9f\u00e9rence, m\u00eame si certaines peuvent \u00eatre d\u00e9terministes (voir la page consacr\u00e9e \u00e0 la <span style=\"color: #3366ff;\"><a href=\"https:\/\/guide-gnss.com\/fr\/metrologie-essais-gnss\/\" style=\"color: #3366ff;\">M\u00e9trologie GNSS<\/a>)<\/span>. Dans les deux cas, la fid\u00e9lit\u00e9 et la justesse des mesures sont pr\u00e9dictibles pour un terminal GNSS donn\u00e9e.<\/p>\n<p>&nbsp;<\/p>\n<p>[\/et_pb_text][\/et_pb_column][et_pb_column type=\u00a0\u00bb1_2&Prime; _builder_version=\u00a0\u00bb4.16&Prime; global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_image src=\u00a0\u00bbhttps:\/\/guide-gnss.com\/wp-content\/uploads\/2024\/01\/240124-carte-gnss.jpg\u00a0\u00bb alt=\u00a0\u00bbGNSS map\u00a0\u00bb title_text=\u00a0\u00bbCarte GNSS\u00a0\u00bb _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][\/et_pb_image][et_pb_text _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb text_font_size=\u00a0\u00bb10px\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb]<\/p>\n<p style=\"text-align: center;\"><em>Figure 1 &#8211; Cartographie des perturbations GNSS caus\u00e9es par l&rsquo;environnement local<\/em><\/p>\n<p>[\/et_pb_text][et_pb_mc_title _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][\/et_pb_mc_title][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=\u00a0\u00bb1_2,1_2&Prime; _builder_version=\u00a0\u00bb4.16&Prime; custom_margin=\u00a0\u00bb40px|auto||auto||\u00a0\u00bb custom_padding=\u00a0\u00bb0px||20px||false|false\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_column type=\u00a0\u00bb1_2&Prime; _builder_version=\u00a0\u00bb4.16&Prime; global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_text _builder_version=\u00a0\u00bb4.16&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb custom_padding=\u00a0\u00bb0px|||||\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb]<\/p>\n<h2>caract\u00e9risation des perturbations<\/h2>\n<p style=\"text-align: justify;\">GUIDE a invent\u00e9 et brevet\u00e9 un proc\u00e9d\u00e9 capable de mesurer les contraintes propres \u00e0 chaque environnement et de mod\u00e9liser des profils de performance correspondant \u00e0 diff\u00e9rents types de terminaux GNSS.<\/p>\n<p style=\"text-align: justify;\">Ainsi, par le calcul, il devient possible de pr\u00e9dire le comportement d&rsquo;un r\u00e9cepteur GNSS, dans un environnement donn\u00e9 avec une dynamique donn\u00e9e. Les zones de dispersion des mesures de positions dites \u00ab erreurs al\u00e9atoires \u00bb, sont d\u00e9limit\u00e9es avec des amplitudes de confiances tr\u00e8s acceptables.<\/p>\n<p style=\"text-align: justify;\">Les cartes GNSS sont l\u00e9g\u00e8res, quelques octets suffisent pour d\u00e9finir une zone de perturbations (ponts, canop\u00e9es, infrastructures), avant m\u00eame toute optimisation num\u00e9rique. Ce proc\u00e9d\u00e9 d\u2019utilisation reste simple et adapt\u00e9 \u00e0 l\u2019informatique habituellement embarqu\u00e9.<\/p>\n<p>&nbsp;<\/p>\n<p>[\/et_pb_text][\/et_pb_column][et_pb_column type=\u00a0\u00bb1_2&Prime; _builder_version=\u00a0\u00bb4.16&Prime; global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_image src=\u00a0\u00bbhttps:\/\/guide-gnss.com\/wp-content\/uploads\/2023\/07\/image-carteGNSS-2-ok-1.jpg\u00a0\u00bb alt=\u00a0\u00bbCarte GNSS\u00a0\u00bb title_text=\u00a0\u00bbProfils des erreurs GNSS\u00a0\u00bb show_in_lightbox=\u00a0\u00bbon\u00a0\u00bb _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][\/et_pb_image][et_pb_text _builder_version=\u00a0\u00bb4.21.0&Prime; text_font_size=\u00a0\u00bb10px\u00a0\u00bb locked=\u00a0\u00bboff\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb]<\/p>\n<p style=\"text-align: center;\"><em>Figure 2 &#8211;\u00a0 Profils des erreurs de positions (trajectoire mesur\u00e9es\/DUT) en fonction des environnements travers\u00e9s<\/em><\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=\u00a0\u00bb1_2,1_2&Prime; _builder_version=\u00a0\u00bb4.16&Prime; custom_margin=\u00a0\u00bb40px|auto||auto||\u00a0\u00bb custom_padding=\u00a0\u00bb0px||20px||false|false\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_column type=\u00a0\u00bb1_2&Prime; _builder_version=\u00a0\u00bb4.16&Prime; global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_text _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb custom_padding=\u00a0\u00bb0px|||||\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb]<\/p>\n<h2>CAS D&rsquo;UTILISATION<\/h2>\n<p style=\"text-align: justify;\">Les cas d\u2019utilisation des cartes GNSS sont appel\u00e9s \u00e0 se d\u00e9velopper avec le d\u00e9ploiement des applications bas\u00e9es sur la g\u00e9olocalisation par satellite.<\/p>\n<p style=\"text-align: justify;\">En zone urbaine, les op\u00e9rateurs et les d\u00e9veloppeurs de solutions ont besoin de connaitre \u00e0 l\u2019avance le niveau de performance des services propos\u00e9s. Cette pr\u00e9diction est d\u2019autant plus pr\u00e9gnante lorsque la pr\u00e9cision attendue est sub d\u00e9cim\u00e9trique.<\/p>\n<p style=\"text-align: justify;\">Avec les v\u00e9hicules toujours plus autonomes, la carte de navigation, dite \u00ab\u00a0<span style=\"color: #3366ff;\"><a href=\"https:\/\/op.europa.eu\/en\/publication-detail\/-\/publication\/a16e08f5-d5f8-11ea-adf7-01aa75ed71a1\/language-en\" target=\"_blank\" rel=\"noopener\" style=\"color: #3366ff;\">HDMAP<\/a><\/span>\u00a0\u00bb est con\u00e7ue pour int\u00e9grer une couche d\u2019information d\u00e9di\u00e9e aux perturbations GNSS. En op\u00e9ration, elle est notamment mise \u00e0 profit par l\u2019algorithme de positionnement pour hybrider les mesures GNSS avec celles d\u2019autres capteurs. Cette architecture syst\u00e8me est essentielle pour robustifier la pr\u00e9cision, des calculs de positions, de vitesses et de caps, avec un haut niveau d\u2019int\u00e9grit\u00e9.<\/p>\n<p style=\"text-align: justify;\">Les hybridations cartographiques sont plus rapides \u00e0 d\u00e9velopper. Elles ont \u00e9galement un niveau d\u2019int\u00e9grit\u00e9 plus facile \u00e0 tester.<\/p>\n<p style=\"text-align: justify;\">Plus g\u00e9n\u00e9ralement, de nombreux cas d\u2019usages sont organis\u00e9s autour de zones g\u00e9o-sensibles comme les syst\u00e8mes d\u2019aides \u00e0 l\u2019exploitation de flottes de v\u00e9hicules.<\/p>\n<p style=\"text-align: justify;\">Un exemple concret consiste \u00e0 utiliser cette carte GNSS dans le domaine ferroviaire, sp\u00e9cifiquement pour l&rsquo;<span style=\"color: #3366ff;\"><a href=\"https:\/\/www.era.europa.eu\/domains\/infrastructure\/european-rail-traffic-management-system-ertms_en\" target=\"_blank\" rel=\"noopener\" style=\"color: #3366ff;\">ERTMS (European Rail Traffic Management System)<\/a><\/span>. Dans ce contexte, la carte GNSS peut \u00eatre employ\u00e9e pour localiser avec pr\u00e9cision les zones les plus appropri\u00e9es afin d\u2019implanter des balises virtuelles.<\/p>\n<p style=\"text-align: justify;\">Enfin, cette carte GNSS peut \u00eatre dress\u00e9e et mise \u00e0 jour automatiquement par les utilisateurs lors de leurs passages.<\/p>\n<p>[\/et_pb_text][\/et_pb_column][et_pb_column type=\u00a0\u00bb1_2&Prime; _builder_version=\u00a0\u00bb4.16&Prime; global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_image src=\u00a0\u00bbhttps:\/\/guide-gnss.com\/wp-content\/uploads\/2023\/08\/image-carteGNSS-4.jpg\u00a0\u00bb alt=\u00a0\u00bbCarte GNSS cas d&rsquo;utilisation\u00a0\u00bb title_text=\u00a0\u00bbPosition RTK carte GNSS\u00a0\u00bb show_in_lightbox=\u00a0\u00bbon\u00a0\u00bb _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][\/et_pb_image][et_pb_text _builder_version=\u00a0\u00bb4.21.0&Prime; text_font_size=\u00a0\u00bb10px\u00a0\u00bb locked=\u00a0\u00bboff\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb]<\/p>\n<p style=\"text-align: center;\"><em>Figure 3 &#8211; Exemple &#8211; En vert, les zones permettant des positions en mode \u00ab\u00a0fixed RTK\u00a0\u00bb avec 3 constellations<\/em><\/p>\n<p>[\/et_pb_text][et_pb_image src=\u00a0\u00bbhttps:\/\/guide-gnss.com\/wp-content\/uploads\/2023\/08\/GNSS-performance-prediction.jpg\u00a0\u00bb alt=\u00a0\u00bbimage KML carte GNSS\u00a0\u00bb title_text=\u00a0\u00bbPr\u00e9diction de performance GNSS\u00a0\u00bb show_in_lightbox=\u00a0\u00bbon\u00a0\u00bb _builder_version=\u00a0\u00bb4.21.0&Prime; _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][\/et_pb_image][et_pb_text _builder_version=\u00a0\u00bb4.21.0&Prime; text_font_size=\u00a0\u00bb10px\u00a0\u00bb locked=\u00a0\u00bboff\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb]<\/p>\n<p style=\"text-align: center;\"><em>Figure 4 &#8211; Exemple &#8211; Pr\u00e9diction de performance GNSS en pr\u00e9cision sur une voie ferroviaire pour l&rsquo;ERTMS<\/em><\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Cartographie des perturbations GNSS dans l\u2019environnement localQu&rsquo;est-ce qu&rsquo;une carte gnss? Les cartes GNSS, qu\u2019elles soient d\u00e9volues aux applications routi\u00e8res, urbaines ou encore ferroviaires, ont pour objectif de d\u00e9terminer la pr\u00e9disposition des terminaux GNSS \u00e0 \u00eatre g\u00e9olocalis\u00e9s sur leurs trajets, c\u2019est-\u00e0-dire leur capacit\u00e9 \u00e0 se positionner avec pr\u00e9cision \u00e0 chaque instant. Les signaux satellitaires (GNSS) sont [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":9227,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.11 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Cartes GNSS - GUIDE GNSS<\/title>\n<meta name=\"description\" content=\"Cartes GNSS des perturbations dans l&#039;environnement local permet de d\u00e9terminer les pr\u00e9dispositions des terminaux GNSS.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/guide-gnss.com\/fr\/carte-gnss\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cartes GNSS - GUIDE GNSS\" \/>\n<meta property=\"og:description\" content=\"Cartes GNSS des perturbations dans l&#039;environnement local permet de d\u00e9terminer les pr\u00e9dispositions des terminaux GNSS.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/guide-gnss.com\/fr\/carte-gnss\/\" \/>\n<meta property=\"og:site_name\" content=\"GUIDE GNSS\" \/>\n<meta property=\"article:modified_time\" content=\"2024-04-11T13:21:25+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/guide-gnss.com\/wp-content\/uploads\/2024\/01\/240124-carte-gnss.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1506\" \/>\n\t<meta property=\"og:image:height\" content=\"956\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data1\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/guide-gnss.com\/fr\/carte-gnss\/\",\"url\":\"https:\/\/guide-gnss.com\/fr\/carte-gnss\/\",\"name\":\"Cartes GNSS - 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