Modelling of rough natural and manmade surfaces at millimetre-wave frequencies – study of the interactions between a target and its natural environment
type: Dataset
description: Systematic characterisation of scattering behaviour of natural (oceans, snow, sand) and manmade (roads...) rough surfaces is required in many radar applications. The scattering elements of such surfaces have complex geometry and are randomly distributed; so their radar scattering involves complex interactions. Moreover, in general, it is found that the overall scattering response of such surfaces is composed of surface (which is function of the surface height statistics) and volume scattering components (due to inclusions underneath the rough interface). During this thesis, we propose and set out rigorous analytical formulations to calculate the scattered power by rough surfaces : Integral Equation Method (IEM) is used to work out the surface scattering and the Radiative Transfer Theory (RTT) is applied to model the volume scattering. The applications of our work are focused on road surfaces such as asphalt and concrete. We studied the evolution of the monostatic scattering coefficients from the nadir to the hardly ever developed grazing incidence, even at millimeter-waves frequencies, in response to large requirements in modeling from remote sensing up to safety in road traffic. Then we evaluated the general bistatic scattering coefficients (scattering in the directions other than incidence direction). An other interesting stage of our work was focused on the evaluation of the behaviour of an object in its close environment. Actually, it is sometimes necessary to take into account the contribution of the coupling of the targets and their immediate environment. We developed a method which evaluates the Radar Cross Section (RCS) of target considering their immediate environment influence, using both the bistatic scattering coefficients from the target and the terrain around it.
issued: 2026-05-28T16:41:27.627249
language: fr
modified: 2026-05-28T16:41:27.627259
contact point: Organization
  fn: CCSD
keyword: backscattering
keyword: bistatic-scattering
keyword: diffusion-bistatique
keyword: incidence-rasante
keyword: infoeu-reposemanticsdoctoralthesis
keyword: integral-equation-method-iem
keyword: methode-de-lequation-integrale-iem
keyword: near-grazing-incidence
keyword: radiative-transfer-theory
keyword: retrodiffusion
keyword: rough-surfaces
keyword: spiotherengineering-sciences-physicsother
keyword: surfaces-rugueuses
keyword: theorie-du-tranfert-radiatif
keyword: theses
landing page: https://theses.hal.science/tel-00012186

Modelling of rough natural and manmade surfaces at millimetre-wave frequencies – study of the interactions between a target and its natural environment
type: Distribution
format: HTML
issued: 2026-05-28T16:41:27.761368
modified: 2026-05-28T16:41:27.553260
access URL: https://theses.hal.science/tel-00012186

test_moissonnage_selune
type: Agent