Asymptotic modelling of coherent scattering from rough pavements

This paper studies the coherent scattering from random rough layers, made up of two uncorrelated random rough surfaces. An analytical asymptotic model, based on the scalar Kirchhoff-tangent plane approximation, is proposed. The results are compared with a rigorous electromagnetic method called PILE (Propagation-Inside-Layer-Expansion) for studying the validity of the model. This approach is applied to road survey by GPR at nadir.