{"id":147,"date":"2010-07-06T10:09:38","date_gmt":"2010-07-06T08:09:38","guid":{"rendered":"https:\/\/samovar2022.int-evry.fr\/index.php\/2010\/07\/06\/soutenance-these-de-alexandre-vervisch-picois\/"},"modified":"2020-09-04T18:47:17","modified_gmt":"2020-09-04T16:47:17","slug":"soutenance-these-de-alexandre-vervisch-picois","status":"publish","type":"post","link":"https:\/\/samovar.telecom-sudparis.eu\/index.php\/2010\/07\/06\/soutenance-these-de-alexandre-vervisch-picois\/","title":{"rendered":"SOUTENANCE : th\u00e8se de Alexandre Vervisch-Picois"},"content":{"rendered":"

vendredi 2 juillet<\/strong> \u00e0 10h30 salle C06<\/p>\n

\u00ab\u00a0Etude de Syst\u00e8mes de Positionnement en Int\u00e9rieur Utilisant des Mesures de Phase du Code ou de Phase de la Porteuse de Signaux de Navigation par Satellites\u00a0\u00bb<\/strong><\/p>\n

Jury<\/strong><\/p>\n

– Pr. Jean-Yves Tourneret, INP-ENSEEIHT, Toulouse – Rapporteur
\n– Pr. Pascal Chevalier, Thal\u00e8s Communications, Colombes – Rapporteur
\n– Pr. Georges Alquie, Universit\u00e9 Pierre et Marie Curie – Examinateur
\n– M. Marc Jeannot, CNES, Toulouse – Examinateur
\n– Pr. Jean-Pierre Delmas, T\u00e9l\u00e9com SudParis – Directeur de th\u00e8se
\n– Dr. Nel Samama, T\u00e9l\u00e9com SudParis – Encadrant<\/p>\n

R\u00e9sum\u00e9<\/strong><\/p>\n

\u00ab\u00a0Les syst\u00e8mes de navigation globaux utilisent des satellites et donnent la position \u00e0 quelques m\u00e8tres \u00e0 l\u2019ext\u00e9rieur. A l\u2019int\u00e9rieur des b\u00e2timents, en revanche leur efficacit\u00e9 diminue drastiquement \u00e0 cause des nombreuses sources d\u2019erreurs que sont les trajets indirects et l\u2019affaiblissement des signaux. C\u2019est ce qui fait du positionnement en milieu difficile un v\u00e9ritable d\u00e9fi technologique. Cette th\u00e8se propose une solution au positionnement int\u00e9rieur issue de deux m\u00e9thodes existantes : les r\u00e9p\u00e9teurs et les pseudolites. On forme ainsi les r\u00e9p\u00e9lites. Le principe des r\u00e9p\u00e9lites est bas\u00e9 sur la reconstitution d\u2019une constellation d\u2019\u00e9metteurs couvrant la zone o\u00f9 les GNSS sont inop\u00e9rants. Un signal provenant d\u2019une source unique est transmis par voie filaire aux diff\u00e9rents \u00e9metteurs, le signal sur chacun de ces \u00e9metteurs est retard\u00e9e diff\u00e9remment et suffisamment pour qu\u2019ils n\u2019interf\u00e8rent pas \u00e0 la r\u00e9ception.<\/p>\n

Deux probl\u00e8mes demeurent et sont l\u2019objet de cette \u00e9tude : les trajets indirects qui perturbent la mesure du temps de propagation entre l\u2019antenne de l\u2019\u00e9metteur et l\u2019antenne du r\u00e9cepteur, et l\u2019\u00e9blouissement entre les signaux, ph\u00e9nom\u00e8ne classique d\u2019interf\u00e9rence pour le CDMA mais exacerb\u00e9 \u00e0 cause des distances courtes et des variations de puissance de r\u00e9ception dues \u00e0 la pr\u00e9sence des trajets indirects (et des obstacles).Pour les trajets indirects nous proposons d\u2019utiliser les mesures de phase de la porteuse qui y sont moins sensibles. Il faut alors solutionner le probl\u00e8me de l\u2019ambigu\u00eft\u00e9 enti\u00e8re sur ces mesures. Nous proposons une m\u00e9thode qui le permet sans avoir recours \u00e0 une technique diff\u00e9rentielle. Il s\u2019agit d\u2019utiliser une boucle de poursuite sp\u00e9ciale insensible aux trajets indirects : la SMICL.<\/p>\n

Pour l\u2019\u00e9blouissement, nous avons d\u00e9velopp\u00e9 trois approches.<\/p>\n

– L\u2019une d\u2019elle utilise les s\u00e9quences de longueurs maximales et permet de r\u00e9duire notablement son importance.<\/p>\n

– Une deuxi\u00e8me m\u00e9thode, baptis\u00e9e \u00ab\u00a0Technique de la Double Emission\u00a0\u00bb (TDE), permet de supprimer int\u00e9gralement ces interf\u00e9rences pour une paire d\u2019\u00e9metteurs lorsque leurs Doppler respectifs sont \u00e9gaux. Nous avons \u00e9tudi\u00e9 en d\u00e9tail le cas pour lequel les Doppler sont diff\u00e9rents et mis au point une version am\u00e9lior\u00e9e de la TDE, la TDE \u00e9tendue \u00e0 la porteuse, qui permet de supprimer les influences du Doppler. Il est \u00e9galement montr\u00e9 que cette derni\u00e8re peut s\u2019appliquer \u00e0 un \u00e9metteur fixe en pr\u00e9sence d\u2019une constellation de satellites.<\/p>\n

– Une troisi\u00e8me m\u00e9thode, appel\u00e9e TDE maximale, utilise \u00e0 nouveau une s\u00e9quence de longueur maximale pour \u00e9tendre la m\u00e9thode TDE au cas de plusieurs \u00e9metteurs en pr\u00e9sence.<\/p>\n

Des simulations sont pr\u00e9sent\u00e9es pour valider l\u2019ensemble de ces techniques qui permettent d\u2019aboutir \u00e0 un syst\u00e8me capable d\u2019op\u00e9rer, relativement simplement, un positionnement sub-m\u00e9trique \u00e0 l\u2019int\u00e9rieur d\u2019un b\u00e2timent.\u00a0\u00bb<\/p>\n

\n","protected":false},"excerpt":{"rendered":"

vendredi 2 juillet \u00e0 10h30 salle C06 \u00ab\u00a0Etude de Syst\u00e8mes de Positionnement en Int\u00e9rieur Utilisant des Mesures de Phase du Code ou de Phase de la Porteuse de Signaux de Navigation par Satellites\u00a0\u00bb Jury – Pr. Jean-Yves Tourneret, INP-ENSEEIHT, Toulouse – Rapporteur – Pr. Pascal Chevalier, Thal\u00e8s Communications, Colombes – Rapporteur – Pr. Georges Alquie, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"","ocean_second_sidebar":"","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"","ocean_custom_header_template":"","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"","ocean_menu_typo_font_family":"","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"","ocean_post_oembed":"","ocean_post_self_hosted_media":"","ocean_post_video_embed":"","ocean_link_format":"","ocean_link_format_target":"self","ocean_quote_format":"","ocean_quote_format_link":"post","ocean_gallery_link_images":"on","ocean_gallery_id":[],"footnotes":""},"categories":[7],"tags":[],"class_list":["post-147","post","type-post","status-publish","format-standard","hentry","category-uncategorized-fr","entry"],"_links":{"self":[{"href":"https:\/\/samovar.telecom-sudparis.eu\/index.php\/wp-json\/wp\/v2\/posts\/147","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/samovar.telecom-sudparis.eu\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/samovar.telecom-sudparis.eu\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/samovar.telecom-sudparis.eu\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/samovar.telecom-sudparis.eu\/index.php\/wp-json\/wp\/v2\/comments?post=147"}],"version-history":[{"count":1,"href":"https:\/\/samovar.telecom-sudparis.eu\/index.php\/wp-json\/wp\/v2\/posts\/147\/revisions"}],"predecessor-version":[{"id":2073,"href":"https:\/\/samovar.telecom-sudparis.eu\/index.php\/wp-json\/wp\/v2\/posts\/147\/revisions\/2073"}],"wp:attachment":[{"href":"https:\/\/samovar.telecom-sudparis.eu\/index.php\/wp-json\/wp\/v2\/media?parent=147"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/samovar.telecom-sudparis.eu\/index.php\/wp-json\/wp\/v2\/categories?post=147"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/samovar.telecom-sudparis.eu\/index.php\/wp-json\/wp\/v2\/tags?post=147"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}