Patent ID: 7379710
Filing Date: 2008-05-27
Classification: G06F,H04B

Abstract:
1. A radio-wave propagation characteristic forecasting system for performing ray launching for obtaining a passage time and an intensity when a structure having an edge, a transmission point, and a reception point are provided in an observation space defined in a three-dimensional space, a plurality of radio-wave rays is radiated from the transmission point at different angles, and the rays repeat reflection and transmission due to collision with the structure caused by their progress and pass the vicinity of the reception point while repeating the reflection and transmission; comprising: ray spread defining means for defining a ray spread provided as a function of propagation distances from the transmission point to the rays; distance calculating means for calculating the distance between each of the rays and the edge; radius calculating means for obtaining a point on each of the rays and a point on an edge for deciding the distance and calculating a ray spread radius to the distance from the point on each of the rays up to the transmission point; and diffracted-ray generating means for generating a plurality of diffracted rays by using the point on the edge as a diffraction point when the ray spread radius is equal to or larger than the distance between each of the rays and the edge.