Position detection system, position detection server, and terminal

A position detection server which performs a process of detecting a position of a terminal which is a target for positioning on a basis of acquired intensity of an electric wave from each of one or more AP units arranged indoors, said terminal measuring the intensity of the electric wave from communications information which each of the one or more AP units transmits at regular intervals, said position detection server comprising:

• an AP position storage unit for storing an AP position which is an installed position of each of the one or more AP units;
• an electric wave intensity history storage unit for storing a history of the intensity of the electric wave from each of the one or more AP units;
• an indoor map storage unit for storing map information about an indoor map including information about locations of walls;
• a position history storage unit for storing a history of the detected position of the terminal;
• a region determining means for, when receiving the intensity of the electric wave from each of the one or more AP units which is acquired by said terminal, calculating a number of walls which exist between the AP position of each of the one or more AP units which is acquired from said AP position storage unit and an immediately preceding position of said terminal which is acquired from said position history storage unit, by using the map information stored in said indoor map storage unit, for correcting the intensity of the electric wave from each of the one or more AP units on a basis of said number of walls, for calculating a distance between each of the one or more AP units and said terminal on a basis of the corrected intensity of the electric wave so as to acquire a distance range, and for calculating a region which is a set of positions which falls within said acquired distance range as an existence region of said terminal;
• and
• a position detecting means for estimating a current state of said terminal on a basis of the history of the position of said terminal which is acquired from said position history storage unit, for acquiring an actionable region in which said terminal can move from the immediately preceding position on a basis of said current state of said terminal, for determining, as a primary movable region of said terminal, a portion in which said actionable region and said existence region of said terminal overlap each other, for determining, as a secondary movable region, a portion which, from the primary movable region, excludes a part which is blocked by walls when viewed from the immediately preceding position of said terminal by using the map information stored in said indoor map storage unit, for acquiring a change in the intensity of the electric wave from each of the one or more AP units from the history of the electric wave intensity stored in said electric wave intensity history storage unit, for estimating a movement direction in which said terminal is moving on a basis of said change, for narrowing said secondary movable region down to a region extending in said movement direction so as to determine said region extending in said movement direction as a tertiary movable region, and for determining the position of said terminal on a basis of said tertiary movable region.

A terminal which is a target for positioning, which measures intensity of an electric wave from each of one or more AP units arranged indoors from communications information which each of the one or more AP units transmits at regular intervals, and which performs a process of detecting a position thereof on a basis of the acquired intensity of the electric wave, said terminal comprising:

• an AP position storage unit for storing an AP position which is an installed position of each of the one or more AP units;
• an electric wave intensity history storage unit for storing a history of the intensity of the electric wave from each of the one or more AP units;
• an indoor map storage unit for storing map information about an indoor map including information about locations of walls;
• a position history storage unit for storing a history of the detected position of said terminal;
• a region determining means for, when acquiring the intensity of the electric wave from each of the one or more AP units, calculating a number of walls which exist between the AP position of each of the one or more AP units which is acquired from said AP position storage unit and an immediately preceding position of said terminal which is acquired from said position history storage unit, by using the map information stored in said indoor map storage unit, for correcting the intensity of the electric wave from each of the one or more AP units on a basis of said number of walls, for calculating a distance between each of the one or more AP units and said terminal on a basis of the corrected intensity of the electric wave so as to acquire a distance range, and for determining a region which is a set of positions which falls within said acquired distance range as an existence region of said terminal;
• and
• a position detecting means for estimating a current state of said terminal on a basis of the history of the position of said terminal which is acquired from said position history storage unit, for acquiring an actionable region in which said terminal can move from the immediately preceding position on a basis of said current state of said terminal, for determining, as a primary movable region of said terminal, a portion in which said actionable region and said existence region of said terminal overlap each other, for determining, as a secondary movable region, a portion which, from the primary movable region, excludes a part which is blocked by walls when viewed from the immediately preceding position of said terminal by using the map information stored in said indoor map storage unit, for acquiring a change in the intensity of the electric wave from each of the one or more AP units from the history of the electric wave intensity stored in said electric wave intensity history storage unit, for estimating a movement direction in which said terminal is moving on a basis of said change, for narrowing said secondary movable region down to a region extending in said movement direction so as to determine said region extending in said movement direction as a tertiary movable region, and for determining the position of said terminal on a basis of said tertiary movable region.