UTD Double Diffraction Within Structure Interaction

The modeling of complex environments can be very challenging. The uniform geometrical theory of diffraction (UTD) has proven to be very useful in this endeavor especially for large scalable geometries in terms of a wavelength. Most of the time including only a few ray types produces very good engineering results. However, in some cases the need for higher order terms becomes necessary. For example, double diffraction can become important near box like objects which can occur in vehicle or indoor and outdoor propagation situations. Tiberio et al. have recently developed improvements leading to a general uniform theoretical solution near shadow boundaries. This paper discusses implementation of enhancements related to multiple interactions with surrounding structures, i.e., through wall propagation