Positioning system using PHS and a radio beacon for logistics

A radio positioning system which uses a PHS terminal and a radio beacon is developed to achieve a low-cost and high accurate positioning system for logistics. Since the PHS positioning error is several hundred meters, it cannot be used to find lost transport objects. In this system, a radio beacon is attached to the PHS terminal and their position is searched by a Yagi antenna. The radio beacon can be powered on by PHS communication. The receivable distance of radio beacon signal is larger than several hundred meters, and wider than the PHS positioning error range. As a result, the lost object position can be measured with the system using PHS and the radio beacon.