Radio wave propagation environment measuring device , wireless network construction system and radio wave propagation ring measurement method .

摘要

To easily obtain three-dimensional shape data and material property data required to estimate radio wave propagation between radio stations in order to construct a reliable radio network. A method for measuring a radio wave propagation environment includes installing radio signal transmission and reception apparatuses at a site at which a radio network system is planned to be constructed and obtaining an electromagnetic wave measured value of a radio signal between the radio signal transmission and reception apparatuses (S301); estimating an electromagnetic wave propagation state of a radio signal between the radio signal transmission and reception apparatuses using an electrical property and three-dimensional structure information of a structure included in the site, the three-dimensional structure information including three-dimensional shape information, to obtain an electromagnetic wave estimated value (S302); making a comparison between the electromagnetic wave measured and estimated values for each time of day, the electromagnetic wave measured and estimated values being expressed as signal strength, to obtain a time domain where an error value between the electromagnetic wave measured and estimated values is greater than a reference value (S304); obtaining, as an electromagnetic wave path, a path between the radio signal transmission and reception apparatuses, of a radio signal received in the time domain; and modifying the three-dimensional structure information of an area located on the electromagnetic wave path to re-obtain the electromagnetic wave estimated value (S306); and making a comparison between the electromagnetic wave measured value and the re-obtained electromagnetic wave estimated value to modify the three-dimensional structure information so that the error value becomes smaller.