Patent ID: 7880673

Claim:
A position determination system comprising: a mobile terminal configured to receive GPS information from a GPS; a base station device configured to measure a round trip time from the mobile terminal; a base-station position table unit configured to store position information on the base station; a cable-length table unit configured to store a cable length between the base station device and an antenna assembly provided to the base station device, the antenna assembly communicates with the mobile terminal; a position determination device configured to determine the position of the mobile terminal on the basis of the round trip time measured by the base station device, the cable length obtained from the cable-length table unit, the position information on the base station obtained from the base station position table unit and the GPS information received from the mobile terminal; and a table calculation device including a position history storage configured to store the GPS information received from the mobile terminal and the round trip time received from the base station device, wherein the table calculation device is configured to update the base-station position table unit and the cable-length table unit on the basis of the GPS information and the round trip time stored at the position history storage.