Positioning system, positioning method, and positioning program

摘要

It is possible to obtain the highly accurate positioning result even when positioning by a GPS is unsuccessful. A positioning server 10 includes a GVM database 12 storing information indicating a relationship between a position and whether or not signal reception from a GPS satellite 40 is possible in the position for each GPS satellite 40, a GPS information acquisition component 13 for acquiring reception GPS information indicating GPS satellites 40 from which the cellular terminal 20 has received signals, a candidate estimation component 14 for estimating candidates for the position of the cellular terminal 20 from the reception GPS information on the basis of the information stored in the GVM database 12, a reception state information acquisition component 15 for acquiring reception state information indicating a reception state of a radio wave from a cellular base station 30 in the cellular terminal 20, and a base station positioning calculation component 17 for estimating the position of the cellular terminal 20 from the candidates for the position of the cellular terminal 20 estimated by the candidate estimation component 14 and the reception state information.