Simplified modeling of complex shaped objects using scattering center distributions and ray optics

In this contribution a parameterization approach is shown, which represents the scattering properties of complex shaped objects by a given number of scattering centers. These centers are characterized by their individual bistatic radar cross section (RCS), so that the objects can be efficiently integrated in a comprehensive system simulation environment by simple look-up tables. These system simulations are used to predict the radio channel in a given environment deterministically. The methodology presented here is based on a ray-optical simulation approach, which is used to derive the scattered fields of the investigated object under free space conditions. For the given object geometry and material properties, the solid angles and amplitudes of the incident and scattered fields are interrelated by geometrical optics (GO), extended by the uniform geometrical theory of diffraction (UTD). For the parameterization of the scattering centers (SC) the spatial information regarding the interaction on the objects surface, namely reflection and diffraction, which is inherently provided by a GO/UTD approach, can be advantageously used. An example parameterization for a passenger car is shown to demonstrate the applicability of the approach.