Dual-polarization determination of soil parameters: theory and experimental data comparison

In this paper the problem of electromagnetic wave scattering from rough surface has been studied. Theoretical models are based on methods of solving the problem of scattering by a statistically rough surface. Time integral equation method permits to determine the scattering intensity from soil without vegetation at great values of roughness mean square (rms) height. In the models of rough surface scattering the normalised RCS of surface characterising the intensity of scattered field is a product of two functions. The first function called dielectric function, characterizes the dielectric properties of the scattering medium and depends on polarization, the angle of incidence and dielectric constant. The second function takes into account the surface roughness influence on normalised RCS. Drawbacks of theoretical models cause the development of empirical models based on experimental results. Empirical model analysis of Oh has shown that for comparitively smooth surfaces, sufficiently fast growth of polarization ratios is observed. There exist best coincidence calculations for the empirical model and experimental values of the normalised RCS. Here, for comparing, the results of the normalised RCS calculations are shown by perturbation and integral equation methods.