A Propagation Model Based on Diffraction by Multiple Rounded Obstacles using a Digital Terrain Model compared with Models using Obstacles of other Shapes - Université de Rennes Accéder directement au contenu
Communication Dans Un Congrès Année : 2000

A Propagation Model Based on Diffraction by Multiple Rounded Obstacles using a Digital Terrain Model compared with Models using Obstacles of other Shapes

Résumé

In the prediction of ground wave propagation loss over irregular terrain, knife-edge (Fresnel-Kirchhoff theory) or wedge (Uniform Theory of Diffraction (U.T.D.)) diffraction is used to predict signal attenuation. But, most of the time, the obstacles encountered along the propagation path are not sharp but look like smooth hills. So, in order to get a better approach of the terrain obstacles, we have developed a model based on multiple diffraction by cylindrical obstacles. This model is applied in the frequency range 1 GHz – 20 GHz using a 2-dimensional Digital Terrain Model (D.T.M) containing altimetry and planimetry information. It uses a maximum of 3 prevalent rounded obstacles. First, the formulation used for single cylinder diffraction is done. Then, the original algorithm to find the radius of curvature of the cylinders, as well as the diffraction path, are described. Finally, this model is applied to a terrain profile extracted from the D.T.M. and containing a prevalent smooth obstacle. The predicted results are compared with measured data obtained by CELAR (Centre d’Electronique de l’Armement) and with models using obstacles of other shapes at a frequency of 2.4 GHz.
Fichier non déposé

Dates et versions

hal-03999053 , version 1 (21-02-2023)

Identifiants

  • HAL Id : hal-03999053 , version 1

Citer

Eric Plouhinec, Gérard Chassay, Bernard Uguen, Thierry Marsault. A Propagation Model Based on Diffraction by Multiple Rounded Obstacles using a Digital Terrain Model compared with Models using Obstacles of other Shapes. Millenium Conference on Antennas & Propagation (AP 2000), Apr 2000, Davos, Switzerland. ⟨hal-03999053⟩
9 Consultations
0 Téléchargements

Partager

Gmail Facebook X LinkedIn More