Position identification server and position identification method

摘要

A position identification server according to the present application includes a storage unit that stores coefficients of parameters of a discriminant function that indicates whether or not a terminal device is located on each floor and a maximum value of pre-measured radio wave strength of each base station on each floor, a communication unit that receives an actual measurement value of radio wave strength of radio waves received by the terminal device from the base station, and a discrimination unit that calculates the parameters of the discriminant function for each floor based on the actual measurement value of radio wave strength received by the communication unit and the maximum value of radio wave strength stored in the storage unit, calculates a solution of the discriminant function for each floor based on the calculated parameters and the coefficients of the parameters stored in the storage unit, and when there are floors where the solution of the discriminant function is greater than or equal to a predetermined value, discriminates that a floor where the solution of the discriminant function is the greatest is a floor where the terminal device is located.

主权项

1. A position identification server comprising:
a memory storing: (i) coefficients of parameters of a discriminant function for each of a plurality of floors, and (ii) a maximum value of pre-measured radio wave strength of each base station on each floor, the discriminant function indicating a probability that a terminal device is located on each floor; and a processor operatively coupled to the memory, the processor being programmed to:
receive an actual measurement value of radio wave strength of radio waves received by the terminal device from the base station;calculate the parameters of the discriminant function for each floor based on the received actual measurement value of radio wave strength and the maximum value of radio wave strength stored in the memory;calculate a solution of the discriminant function for each floor based on the calculated parameters and the coefficients of the stored parameters; andwhen more than one of the calculated solutions of the discriminant function is greater than or equal to a predetermined value, discriminate that a floor where the solution of the discriminant function is the greatest is a floor where the terminal device is located, the solution indicating: (i) a lower probability when a maximum value stored in the memory is lower than the actual measurement value, and (ii) a higher probability when the maximum value stored in the memory is higher than the actual measurement value.