| 摘要 |
PROBLEM TO BE SOLVED: To enable verifying the location of a moving body which freely moves indoors/outdoors by receiving electric waves transmitted from the moving body with three or more than three fixed stations, transmitting the identification number and electric field strength of the moving body and the identification numbers of the fixed stations to a control station, and computing the location of the moving body. SOLUTION: An area (e.g. an event site) 1 where moving bodies 2 such as children freely move is divided into small square areas 3, and a fixed station 4 is provided at each of the endpoints of the squares. Each fixed station 4 is connected to a control station 6 located out of the area 1 with a communication cable 5. Each fixed station 4 receives electric waves transmitted from the moving bodies 2, recognizes the specific identification number of each moving body 2 contained in the electric waves, measures the electric field strength of the electric waves, and transmits them together with the specific identification numbers of the control station 6. Here, the control station 6 estimates the location of the moving body 2 from the identification numbers of the fixed stations, the identification number and electric field strength of the moving body 2, and the function between electric field strength and distance and displays it. |
