Paper Info
Title
PT-Sync: COTS Speaker-based Pseudo Time Synchronization for Acoustic Indoor Positioning
Abstract
Positioning with a small number of anchors is an important issue in the study of acoustic indoor positioning systems (AIPS). We present PT-Sync, a novel approach to time-synchronize between a commercial off-the-shelf (COTS) speaker and a mobile device by leveraging acoustic sensing and reflected signals from the floor. PT-Sync enables ranging with one speaker and 2-D positioning with two speakers without any additional hardware. Our proposed time synchronization method requires height information from the floor in the calculation process, which we estimate by active acoustic sensing. Using a unique averaging technique and IMU enables robust height estimation. PT-Sync can be used in a variety of indoor environments and can be time-synchronized with already installed speakers. The results of the evaluation experiment confirmed that a synchronization error of 0.16 ms was achieved even at a distance of 6 m from the speaker, and that synchronization on the order of microseconds could be achieved. Furthermore, pedestrian tracking experiments confirmed that positioning of less than 38.9 cm can be achieved at the 90th percentile.
Year
DOI
Venue
2022
10.1109/IPIN54987.2022.9918109
2022 IEEE 12th International Conference on Indoor Positioning and Indoor Navigation (IPIN)
Keywords
DocType
ISSN
acoustic,indoor localization,smartphone,time synchronization,ToA,acoustic sensing,mirror image,COTS speaker
Conference
2162-7347
ISBN
Citations 
PageRank 
978-1-7281-6219-5
0
0.34
References 
Authors
11
6
Name
Order
Citations
PageRank
Takumi Suzaki100.68
Hiroaki Murakami200.68
Masanari Nakamura300.68
Hiroki Watanabe42613.47
Hiromichi Hashizume500.34
Masanori Sugimoto611.71