Patent ID: 8717952
Filing Date: 2014-05-06
Classification: G01S,H04W

Abstract:
1. A wireless terminal positioning system including a plurality of wireless terminals and a positioning management terminal that manages positioning of the plurality of wireless terminals, wherein the positioning management terminal includes: a positioning object decision section that selects a terminal to be positioned which is a positioning object and a plurality of positioning standard terminals whose positions are known, from among the plurality of wireless terminals; a positioning management section that requests distances between the terminal to be positioned and the positioning standard terminals; a position calculation section that calculates a target position of the terminal to be positioned; and a storage section that keeps a wireless terminal list that includes terminal addresses of the plurality of wireless terminals and positions thereof and an adjacent terminal list of adjacent terminals to which wireless signals from each of the plurality of wireless terminals reach, each of the plurality of wireless terminals includes: a distance measurement section that measures the distances from adjacent terminals that wireless signals of the wireless terminal reach; a communication section that transmits measurement results of the distance measurement section to the positioning management terminal, and an adjacent terminal search section that searches the adjacent terminals that wireless signals reach; and wherein the positioning management section requests the adjacent terminal list of each of the plurality of wireless terminals, the adjacent terminal search section searches the adjacent terminals of the relevant wireless terminal based on the request for resultant adjacent terminal list to the positioning management terminal, the positioning object decision section selects a terminal whose position has not been defined and that has a predetermined number of the adjacent terminals or more whose positions have been defined in the corresponding adjacent terminal list as the terminal to be positioned, the positioning management section requests distances from the positioning standard terminals selected by the positioning object decision section to the terminal to be positioned selected by the positioning object decision section, and the position calculation section calculates the target position of the terminal to be positioned using the distances and reference positions of the positioning standard terminals.