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| Content Provider | Springer Nature Link |
|---|---|
| Author | Belkadid, Jamal Bennani, Saad Dosse Rifi, Mounir |
| Copyright Year | 2005 |
| Abstract | Nous présentons dans cet article une approche temporelle discrète nous amenant à modéliser la propagation d’un signal hyperfréquence dans un milieu stratifié. Cette étape va aboutir à un modèle numérique calculant, à partir des équations des lignes de transmission dont les paramètres sont adaptés selon le milieu de propagation, la forme temporelle du signal réfléchi telle qu ’elle est enregistrée par un réflectomètre. Une analyse temps-fréquences du signal réfléchi obtenu permet, en variant la valeur d’un seuil sur le scallo-gramme du signal, de détecter des zones à faible épaisseur très atténuatrices qui n’apparaissent pas en premier temps, la valeur du seuil dépend du degré d’atténuation de cette zone.We present in this paper a discrete temporal approach leading us to model the propagation of a signal ultra high frequency in a laminated medium. This stage will lead to a digital model calculating, starting from the equations of the lines of transmission whose parameters are adapted according to the propagation medium, the temporal shape of the reflected signal such as it is recorded by a reflectometer. A time-frequency analysis of the reflected signal allows, by varying the value of a threshold on the scallogramme of the signal, to detect a lossy thin zone which do not appear in the first results, the value of the threshold depends on the degree of attenuation of this zone. |
| Starting Page | 1244 |
| Ending Page | 1267 |
| Page Count | 24 |
| File Format | |
| ISSN | 00034347 |
| Journal | Annales Des Télécommunications |
| Volume Number | 60 |
| Issue Number | 9-10 |
| e-ISSN | 19589395 |
| Language | English |
| Publisher | Springer-Verlag |
| Publisher Date | 2005-01-01 |
| Publisher Place | Paris |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Geophysical prospecting Radar Transmission line Wave reflection Ground Frequency time representation Electrical characteristic Electromagnetic wave propagation Guided wave Humidity Microwave reflectometer Time domain method Stratified medium Waveguide Wavelets Communications Engineering, Networks Information Systems and Communication Service Signal, Image and Speech Processing Computer Communication Networks Information and Communication, Circuits R & D/Technology Policy |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electrical and Electronic Engineering |
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