| 摘要 |
PROBLEM TO BE SOLVED: To provide a positioning system capable of measuring the position of a person to be positioned even if a base station becomes unusable because of a blackout derived from a disaster such as an earthquake or thunderbolt.SOLUTION: In a positioning system, handheld terminals directly transmit or receive a radio wave. A positioning person handheld terminal 12 includes reference azimuth designation means that designates a reference azimuth L1 of a handheld terminal 12, bearing calculation means that measures the intensities of radio waves, which are originated from plural persons-to-be-positioned handheld terminals (for example, 22a to 22d), direction by direction by rotating the handheld terminal 12, and calculates the bearings of respective handheld terminals 22 with respect to the reference azimuth L1 when the radio wave intensities become highest, distance calculation means that calculates the distances from the handheld terminal 12 to the respective handheld terminals 22 by collating the intensities of the radio waves, which are originated from the respective handheld terminals 22 at the calculated bearings, with the correlation between the radio wave intensities and distance attenuation levels, and position display means that displays in coordinates the positions of the respective handheld terminals 22, which are determined with the bearings and distances and centered on the handheld terminal 12, together with the reference azimuth L1.SELECTED DRAWING: Figure 3 |
