RADIO WAVE PROPAGATION ENVIRONMENT MEASUREMENT DEVICE WIRELESS NETWORK CONSTRUCTION SYSTEM AND RADIO WAVE PROPAGATION ENVIRONMENT MEASUREMENT METHOD

摘要

The purpose of the present invention is to easily obtain three dimensional shape data and material characteristics data that are necessary for estimating radio wave propagation between wireless stations in order to construct a highly reliable wireless network. In the present invention a wireless network system is provided with wireless signal transmission and reception equipment at a planned construction site. An electromagnetic wave measurement value for a wireless signal between the equipment is obtained. Three dimensional structure information that includes the electrical characteristics and three dimensional shape information of structures that comprise the site is used to estimate a propagation state of an electromagnetic wave for a wireless signal between the wireless signal transmission and reception equipment and thereby an electromagnetic estimation value is obtained. An electromagnetic wave measurement value expressed as a signal intensity at each time point and an electromagnetic wave estimation value are compared for each time point to obtain a time zone in which such resultant error value is larger than a reference value. The path between the wireless signal transmission and reception equipment that is receiving in such time zone is calculated as the electromagnetic wave path. The three dimensional structure information for the site positioned on the electromagnetic wave path is corrected and the electromagnetic wave estimation value is re calculated. The electromagnetic wave measurement value and the re calculated electromagnetic wave estimation value are compared to obtain corrected information for three dimensional structure information with a smaller error value.