Study of statistical interaction contribution for computation of radar cross section

This report presents a new radar measuring method to be used to measure the diffuse interaction contribution between a rough surface and an object. The method is based on Inverse Synthetic Aperture Radar (ISAR) technique which enables separations between different contributions of the radar cross section. Measurements have been performed on a plane plate, which has been mounted at different elevation angels, over a rough surface. The measurement results have been compared with results from a statistical computational model which is based on a combination of geometrical optics and Improved Integral Equation Method (IIEM). The comparison between the calculated och measured results shows a relatively good agreement at 10 GHz for both the VV- and HV-polarisation combination. The conclusion is that the computational model is very fast and can be used when calculate the radar cross section for large objects in large background scenes. Furthermore, calculations have been performed with a commercial code (SPECRAY EM) which is base on geometrical- and physical optics. In contrast to the statistical method this code requires a facetted CAD-model of the scene. I turns out that this method is less suitable for this kind of scattering problems due to unreasonable large memory requirements and long CPU-times.