Smartphone Positioning with a Single Speaker Using Hypothesis-Based Tracking

Although it is possible to perform smartphone positioning with only a single speaker by using reflected waves from walls and floors, there are issues with positioning errors caused by missed detections, misidentifications, and degeneracy of reflected waves depending on the indoor environment and the microphone’s position and orientation. Therefore, we propose a method to reduce positioning errors by generating and tracking hypotheses about the observation status of the reflected waves. Through performance evaluation in a real environment using a smartphone, we confirmed that this method can reduce the error by approximately 50% (90th percentile error: approximately 0.7m) compared to conventional methods.
Paper: Yoshida, I., Nakamura, M., Murakami, H., Hashizume, H., Sugimoto, M.: Hypothesis-Based Smartphone Tracking Using Multipath from a Single Speaker, In Proceedings of IPIN 2025 (to appear).