{"id":21349,"date":"2025-04-04T10:17:27","date_gmt":"2025-04-04T08:17:27","guid":{"rendered":"https:\/\/www.univ-smb.fr\/listic\/?p=21349"},"modified":"2025-04-30T18:31:14","modified_gmt":"2025-04-30T16:31:14","slug":"soutenance-d-these-de-hugo-brehier-le-4-decembre-2024-detection-pour-limagerie-radar-a-travers-murs-par-decompositions-de-rang-faible-et-parcimonieuse","status":"publish","type":"post","link":"https:\/\/www.univ-smb.fr\/listic\/archive-actualites\/soutenance-d-these-de-hugo-brehier-le-4-decembre-2024-detection-pour-limagerie-radar-a-travers-murs-par-decompositions-de-rang-faible-et-parcimonieuse\/","title":{"rendered":"Soutenance de th\u00e8se de Hugo Brehier, le 4 d\u00e9cembre 2024: D\u00e9tection pour l\u2019Imagerie Radar \u00e0 Travers Murs par d\u00e9compositions de rang faible et parcimonieuse"},"content":{"rendered":"<p><strong>R\u00e9sume:<\/strong><\/p>\n<p>L&rsquo;imagerie radar \u00e0 travers murs est un domaine de recherche visant \u00e0 imager des pi\u00e8ces cach\u00e9es \u00e0 l&rsquo;\u0153il nu par un mur. Cela pr\u00e9sente des d\u00e9fis dus notamment \u00e0 la distorsion du signal caus\u00e9e par le mur ainsi que par la sc\u00e8ne \u00e0 imager. \u00c0 cela s&rsquo;ajoute un bruit ambiant qui complique la d\u00e9tection des signaux faibles provenant des cibles. Les travaux entrepris dans cette th\u00e8se se concentrent sur la d\u00e9tection et la localisation de cibles stationnaires dans un sc\u00e9nario en deux dimensions spatiales.Nous introduisons des m\u00e9thodes d&rsquo;imagerie bas\u00e9es sur la reconstruction jointe des \u00e9l\u00e9ments constituant la sc\u00e8ne, \u00e0 savoir le mur et les cibles cach\u00e9es. Nous utilisons une d\u00e9composition en rang faible et parcimonieux via une extension de RPCA.Nous \u00e9tudions ensuite son extension \u00e0 des bruits h\u00e9t\u00e9rog\u00e8nes via une distance robuste dite de Huber. Nous \u00e9tudions \u00e9galement son extension non-convexe sur la vari\u00e9t\u00e9 des matrices de rang fixe.Finalement, nous abordons la transition vers une m\u00e9thode bas\u00e9e sur les donn\u00e9es, en utilisant une m\u00e9thode hybride dite de r\u00e9seau d\u00e9roul\u00e9 bas\u00e9 sur un gradient proximal.Les r\u00e9sultats montrent que les m\u00e9thodes propos\u00e9es surpassent les approches classiques en simulations. Toutefois, des d\u00e9fis persistent, notamment dans la prise en compte des effets physiques complexes sur le signal. Nous soulignons le potentiel de ces m\u00e9thodes pour des applications plus larges, comme les radars \u00e0 p\u00e9n\u00e9tration de sol et l&rsquo;imagerie computationnelle.<\/p>\n<p>Th\u00e8se pr\u00e9par\u00e9e dans l\u2019unit\u00e9 de recherche SONDRA (CentraleSup\u00e9lec, Universit\u00e9<br \/>\nParis-Saclay) sous la direction de <strong>Guillaume GINOLHAC<\/strong>, Professeur \u00e0 l&rsquo;Universit\u00e9 Savoie Mont Blanc, le<br \/>\nco-encadrement de<strong> Chengfang REN<\/strong>, ma\u00eetre de conf\u00e9rences, de<strong> Arnaud BRELOY<\/strong>,<br \/>\nProfesseur des Universit\u00e9s, et de <strong>Israel HINOSTROZA<\/strong>, ing\u00e9nieur de recherche.<\/p>\n<p><strong>Composition du jury<\/strong><br \/>\nMembres du jury avec voix d\u00e9lib\u00e9rative<br \/>\n<strong>Nelly PUSTELNIK<\/strong> <em>Pr\u00e9sidente &amp; Examinatrice,Directrice de recherche, CNRS (ENS Lyon)<\/em><br \/>\n<strong>Michael MUMA<\/strong> <em>Rapporteur Professeur, TU Darmstadt<\/em><br \/>\n<strong>Jean-Yves TOURNERET<\/strong> <em>Rapporteur Professeur des Universit\u00e9s, INP de Toulouse<\/em><br \/>\n<strong>Muriel DARCES<\/strong> <em>Examinatrice Professeure des Universit\u00e9s, Sorbonne Universit\u00e9<\/em><br \/>\nJ<strong>eremy COHEN<\/strong> <em>Examinateur Charg\u00e9 de recherche, CNRS (Univ. Lyon I &#8211; INSA Lyon)<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>R\u00e9sume: L&rsquo;imagerie radar \u00e0 travers murs est un domaine de recherche visant \u00e0 imager des pi\u00e8ces cach\u00e9es \u00e0 l&rsquo;\u0153il nu par un mur. Cela pr\u00e9sente des d\u00e9fis dus notamment \u00e0 la distorsion du signal caus\u00e9e [&hellip;]<\/p>\n","protected":false},"author":499,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"none","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"both","_seopress_redirections_param":"","_seopress_redirections_type":301,"_seopress_analysis_target_kw":"","_seopress_news_disabled":"","_seopress_video_disabled":"","_seopress_video":[],"_seopress_pro_schemas_manual":[],"_seopress_pro_rich_snippets_disable_all":"","_seopress_pro_rich_snippets_disable":[],"_seopress_pro_schemas":[],"_relevanssi_hide_post":"","_relevanssi_hide_content":"","_relevanssi_pin_for_all":"","_relevanssi_pin_keywords":"","_relevanssi_unpin_keywords":"","_relevanssi_related_keywords":"","_relevanssi_related_include_ids":"","_relevanssi_related_exclude_ids":"","_relevanssi_related_no_append":"","_relevanssi_related_not_related":"","_relevanssi_related_posts":"","_relevanssi_noindex_reason":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[19],"tags":[],"class_list":["post-21349","post","type-post","status-publish","format-standard","hentry","category-archive-actualites"],"acf":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/www.univ-smb.fr\/listic\/wp-json\/wp\/v2\/posts\/21349","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.univ-smb.fr\/listic\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.univ-smb.fr\/listic\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.univ-smb.fr\/listic\/wp-json\/wp\/v2\/users\/499"}],"replies":[{"embeddable":true,"href":"https:\/\/www.univ-smb.fr\/listic\/wp-json\/wp\/v2\/comments?post=21349"}],"version-history":[{"count":2,"href":"https:\/\/www.univ-smb.fr\/listic\/wp-json\/wp\/v2\/posts\/21349\/revisions"}],"predecessor-version":[{"id":21544,"href":"https:\/\/www.univ-smb.fr\/listic\/wp-json\/wp\/v2\/posts\/21349\/revisions\/21544"}],"wp:attachment":[{"href":"https:\/\/www.univ-smb.fr\/listic\/wp-json\/wp\/v2\/media?parent=21349"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.univ-smb.fr\/listic\/wp-json\/wp\/v2\/categories?post=21349"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.univ-smb.fr\/listic\/wp-json\/wp\/v2\/tags?post=21349"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}