{"id":6790,"date":"2021-12-16T14:17:19","date_gmt":"2021-12-16T13:17:19","guid":{"rendered":"https:\/\/www.mio.osupytheas.fr\/fr\/felicitations-a-baptiste-dombs-oplc-qui-a-soutenu-sa-these-le-lundi-13-decembre-2021\/"},"modified":"2021-12-16T14:17:19","modified_gmt":"2021-12-16T13:17:19","slug":"congratulations-to-baptiste-dombs-oplc-who-defended-his-these-on-monday-13-december-2021","status":"publish","type":"post","link":"https:\/\/www.mio.osupytheas.fr\/en\/felicitations-a-baptiste-dombs-oplc-qui-a-soutenu-sa-these-le-lundi-13-decembre-2021\/","title":{"rendered":"Congratulations to Baptiste Dombs (OPLC), who defended his thesis on Monday 13 December 2021."},"content":{"rendered":"
<\/div> <\/div> <\/div>

On the following subject:
\"Identification and detection of transient phenomena in low signal-to-noise ratio radar measurements. Joint applications to oceanographic and atmospheric problems\".
\u00a0
Under the supervision of Mr Charles-Antoine GUERIN, University Professor, University of Toulon and Mr Julien MARMAIN, Degreane Horizon, thesis co-supervisor.<\/p>

before a jury made up of<\/p>

\u00a0<\/p>

Alexandre BAUSSARD, University Professor, Troyes University of Technology, Rapporteur
Ren\u00e9 GARELLO, Professor Emeritus, IMT Atlantique, Rapporteur
Ms Anne MOLCARD, University Professor, University of Toulon, Examiner
Ms Marie LOTHON, CNRS Research Fellow, OMP - Observatoire Midi-Pyr\u00e9n\u00e9es de Toulouse, Examiner
Mr Julien MARMAIN, Doctor, Degreane Horizon, Co-supervisor
Charles-Antoine GUERIN, University Professor, University of Toulon, Director<\/p>

Abstract<\/p>

Radar remote sensing can be used to observe the dynamics of the atmosphere and ocean surface. In both cases, the usual approach is to numerically calculate the Doppler spectrum of the time echoes received using a discrete Fourier transform. Although satisfactory for most applications, this method is not suitable for observing transient phenomena, which are shorter than the integration time required for radar observation. We use an alternative technique, based on an autoregressive representation of the radar time series and associated with the maximum entropy method. This approach is applied to the measurement of surface currents by coastal radar in the high-frequency band, and then to the measurement of wind in the lower atmosphere by L-band radar. In both situations, we show using numerical simulations, comparisons with other instruments and case studies that the proposed approach leads to reliable estimates of geophysical quantities (marine currents and wind speeds) for short integration times, where the conventional method fails.<\/p>

\u00a0<\/p>

Key words: remote sensing, oceanographic radars, wind profilers, ocean currents, space radars, tsunami, turbulence, autoregressive models, maximum entropy method.<\/p><\/div><\/div><\/div> <\/div> <\/div> <\/div> <\/div> <\/div><\/div>","protected":false},"excerpt":{"rendered":"

Sur le sujet suivant :“Identification et d\u00e9tection de ph\u00e9nom\u00e8nes transitoires contenus dans les mesures radar \u00e0 faible rapport signal \u00e0 bruit. Applications conjointes aux probl\u00e9matiques oc\u00e9anographique et atmosph\u00e9rique”\u00a0Sous la direction […]<\/p>\n","protected":false},"author":1,"featured_media":4489,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-6790","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.mio.osupytheas.fr\/en\/wp-json\/wp\/v2\/posts\/6790","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mio.osupytheas.fr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.mio.osupytheas.fr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.mio.osupytheas.fr\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mio.osupytheas.fr\/en\/wp-json\/wp\/v2\/comments?post=6790"}],"version-history":[{"count":0,"href":"https:\/\/www.mio.osupytheas.fr\/en\/wp-json\/wp\/v2\/posts\/6790\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.mio.osupytheas.fr\/en\/wp-json\/wp\/v2\/media\/4489"}],"wp:attachment":[{"href":"https:\/\/www.mio.osupytheas.fr\/en\/wp-json\/wp\/v2\/media?parent=6790"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.mio.osupytheas.fr\/en\/wp-json\/wp\/v2\/categories?post=6790"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.mio.osupytheas.fr\/en\/wp-json\/wp\/v2\/tags?post=6790"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}