Patent ID: 8666320

Claim:
A radio wave propagation characteristic estimating system for estimating a radio wave propagation characteristic, comprising: an object selecting unit for selecting, from objects within a region, an object whose effect on an estimation precision is small by using position data of a transmission point; a number of constituent faces reducing unit for reducing the number of constituent faces of said object selected; and a radio wave propagation estimating unit for estimating radio wave propagation by using an object not selected by said object selecting unit and an object whose number of constituent faces is reduced by said number of constituent faces reducing unit, wherein said object selecting unit classifies said objects into objects within sight from a transmission point and objects out-of-sight, wherein, when an object is classified as an object within sight, said object selecting unit selects the object when a distance from the transmission point to a representative point of the object is longer than a first distance, the first distance being a distance at which a propagation loss in free space will be an allowable propagation loss, and wherein, when an object is classified as an object out-of-sight, said object selecting unit selects the object when the distance from the transmission point to the representative point of the object is longer than a second distance, the second distance being a distance at which a propagation loss defined by an estimation expression of an out-of-sight propagation loss with a distance as an argument will be an allowable propagation loss, the first distance being larger than the second distance, wherein said number of constituent faces reducing unit: reduces the number of constituent faces of only selected objects by generating a candidate group having a plurality of the selected objects, members of the candidate group have a distance between a member and at least one adjacent member being less than a predetermined distance, determining a maximum height and a minimum height of members of the candidate group, and maintaining members of the candidate group as a combined group when a difference between the maximum height and minimum height is less than a predetermined height threshold and combining members of the combined group into one object as a combined object, reduces the number of constituent faces of only selected objects by deleting said object selected by said object selecting unit, and reduces the number of constituent faces of only selected objects by simplifying a shape of said object selected by said object selecting unit.