DETERMINATION DEVICE, DETERMINATION METHOD, AND DETERMINATION SYSTEM

To control a control target device with improved security.SOLUTION: A determination device includes a determination section that determines whether a portable device is positioned in a first area or a second area on the basis of results of ranging based on wireless communication in conformity with a designated communication standard between each of at least two first wireless communication devices, which is disposed with a boundary arrangement object interposed therebetween and arranged at a boundary between the first area and the second area, and a second wireless communication device which is installed in the portable device carried by a user. The determination section determines whether the portable device is positioned in the first area or the second area on the basis of a difference between a ranging value calculated by the first wireless communication device disposed in the first area and a ranging value calculated by the first wireless communication device disposed in the second area.SELECTED DRAWING: Figure 3 【課題】セキュリティ性をより高めた被制御装置の制御を実現する。【解決手段】第１のエリアと第２のエリアとの境界に設置される境界配置物を挟んで配置される少なくとも２つの第１の無線通信装置の各々とユーザにより携帯されるポータブル機器に搭載される第２の無線通信装置との間における規定の通信規格に準拠した無線通信に基づく測距の結果に基づき、前記ポータブル機器が前記第１のエリアまたは前記第２のエリアのいずれに位置するかを判定する判定部、を備え、前記判定部は、前記第１のエリアに配置される第１の無線通信装置が算出した測距値と前記第２のエリアに配置される第１の無線通信装置が算出した測距値との差に基づいて、前記ポータブル機器が前記第１のエリアまたは前記第２のエリアのいずれに位置するかを判定する、判定装置が提供される。【選択図】図３