Summary
International Symposium on Antennas and Propagation
2009
Session Number:2B3
Session:
Number:2B3-4
Sensitivity study of random volume over ground electromagnetic scattering versus volume fraction
Pierre Borderies, Ludovic Villard, Bertille Fourestie,
pp.401-404
Publication Date:2009/10/21
Online ISSN:2188-5079
Summary:
A forest may be described as a collection of discrete scattering elements. Actually, most existing scattering models rest on evaluating the global scattering with as a starting point such a discrete description, and also usually the consideration of layering is introduced. The considered scattering elements are usually modelled as finite length dielectric cylinders for trunks and branches and ellipsoids for leaves. Al low frequencies such as P band, most scattered power is originated by trunks and branches, and also the underlying soil in its direct contribution but also in its interaction with the volume. Branches have typical values of a few cm radii and a few m length (for example 1.5 cm radius and 3 m length). Then at P band their scattering regimes are between the Rayleigh region and the resonance region, so that that the electromagnetic field scattered grows as long as their dimensions grow for each individual element, but for a set of scatterers this trend is balanced by the growing extinction inside the medium. The goal of this paper is to analyze the behaviour of the electromagnetic scattering of a volume composed of a set of randomly oriented typical dielectric cylinders over a typical soil as a function of the descriptive parameters: radius, moisture content, volume fraction and concentration. It is organized as follows. Section 2 presents the simulation tools which are going to be used. Section 3 describes the results for single element. Section 4 is dedicated to a collection of scatterers.