Abstract
This paper is concerned with a reduction of computation time of Discrete Ray Tracing Method (DRTM) which is a numerical method for analyzing electromagnetic fields above random rough surfaces (RRSs). In the DRTM, we discretize RRSs as well as ray searching. In order to reduce computation time for ray searching, we modify the conventional algorithm discretizing RRSs with equal intervals to a new one which discretizes them with unequal intervals according to their profile. In addition, we introduce an approximation of Fresnel function 'which enables us to reduce field computation time. We discuss the reduction of computation time of DRTM from the numerical view points of ray searching and field computation.
