Method for positioning by Wi-Fi signals

摘要

A method for positioning a terminal using signals received from a plurality of access points of at least one wireless telecommunications network is disclosed. According to some aspects, the terminal first retrieves identifiers of the access points from the received signals, then searches in a first database (BDP) for respective geographical position information for the access points. A first estimation of a position of the terminal or a positioning zone of the terminal is obtained from geographical position information of the access points, then topographical information corresponding to the first estimation of the position or the positioning zone is retrieved from a second database (SIG). A second estimation of the position of the terminal is performed using the topographical information thus obtained.

主权项

1. A method for positioning a terminal using signals received from a plurality of access points of at least one wireless telecommunications network, the method comprising:
retrieving identifiers of the access points from the received signals; searching in a first database (BDP) for geographical information for the access points based on their respective identifiers, the geographical information enabling a prediction of power values of the received signals on a meshing of a space; estimating position information of the terminal within the space, based at least in part on the geographical information of the access points, the estimated position information corresponding to an estimated position of the terminal or information regarding an estimated positioning zone in which the terminal is located; retrieving, from a second database (SIG), topographical information corresponding to a zone around the estimated position, or the estimated positioning zone, the second database further defining a space of authorized positions as well as a space of prohibited positions for terminals; and estimating the position of the terminal based on the retrieved topographical information, wherein the positioning method is carried out for a plurality of terminals and further comprises:
storing traces of the plurality of terminals in a centralized memory, where a trace of a terminal is defined as a set of identifiers retrieved for estimated positions of the terminal during a particular period; andoptimizing geographical information of the access points, by minimizing on average a cost function over all of the traces of the plurality of terminals.