Ray analysis of mutual coupling between point scatterers in RCS diagram

When scattering on a complex radar target modelled by point scatterers is calculated, interference functions between the signals issuing from these points taken two by two are made to intervene, yet, when these functions are experimentally measured on two reducible objects with two point scatterers, considerable difference from theoretical expectations can be seen. We will show that these differences result chiefly from the mutual dependence between the objects and, by a calculation based solely on the laws of geometric optics, we propose a correction of the fundamental interference functions. The results obtained with the help of this correction are in excellent agreement with the experimental measurements, even in the case where the scattering objects are in contact.