A Geometrical Optics Model of Three Dimensional Scattering From a Rough Layer With Two Rough Surfaces

作者：Pinel Nicolas^*; Johnson Joel T; Bourlier Christophe

来源：IEEE Transactions on Antennas and Propagation, 2010, 58(3): 809-816.

DOI：10.1109/TAP.2009.2039306

• Electromagnetic scattering by rough surfaces
• multilayered media
• physical optics
• multistatic scattering

An asymptotic method is described for predicting the bistatic normalized radar cross section of a rough homogeneous layer made up of two rough surfaces. The model is based on iteration of the Kirchhoff approximation to calculate the fields scattered by the rough layer, and is reduced to the high-frequency limit in order to obtain numerical results rapidly. Shadowing effects, significant for large incidence or scattering angles, are taken into account through the use of shadowing functions. The model is applicable for moderate to large surface roughnesses having small to moderate slopes, and for both loss-less and lossy inner media. It was validated for a rough layer with a rough surface over a perfectly flat surface in a preceding contribution. Here, the extension of the model to a rough layer with two rough surfaces is developed, and results are presented to validate the asymptotic model by comparison with a numerical reference method.

• 出版日期2010-3