Abstract
Acoustical positioning is one of the attractive schemes for indoor positioning. To achieve positioning with a small number of devices, we have proposed a transponder-based scheme using audible sound. However, this scheme has not yet been evaluated in an actual large-scale environment. In addition, the effects of signal reflection were not revealed. In this study, the proposed scheme is evaluated in a large-scale room, and the effects of signal reflection and coverage positioning area are investigated. The experimental results suggest that the proposed method is sensitive to signal reflections. To cope with this problem, we improved the measurement procedure to detect a direct signal. It was found that the improved scheme can achieve positioning with error of less than 0.08 ± 0.01 m covering a 7 × 7 m2 area. Hence, we confirmed that the improved method can achieve accurate positioning and can cover a large-scale area.
Published Version
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