Research Article
Expanding the Positioning Area for Acoustic Localization Using COTS Mobile Devices
@INPROCEEDINGS{10.1007/978-3-030-94822-1_23, author={Takumi Suzaki and Masanari Nakamura and Hiroaki Murakami and Hiroki Watanabe and Hiromichi Hashizume and Masanori Sugimoto}, title={Expanding the Positioning Area for Acoustic Localization Using COTS Mobile Devices}, proceedings={Mobile and Ubiquitous Systems: Computing, Networking and Services. 18th EAI International Conference, MobiQuitous 2021, Virtual Event, November 8-11, 2021, Proceedings}, proceedings_a={MOBIQUITOUS}, year={2022}, month={2}, keywords={Chirp Acoustic indoor localization TDoA Smartphone FDMA and TDMA Sensing}, doi={10.1007/978-3-030-94822-1_23} }- Takumi Suzaki
Masanari Nakamura
Hiroaki Murakami
Hiroki Watanabe
Hiromichi Hashizume
Masanori Sugimoto
Year: 2022
Expanding the Positioning Area for Acoustic Localization Using COTS Mobile Devices
MOBIQUITOUS
Springer
DOI: 10.1007/978-3-030-94822-1_23
Abstract
In this paper, we propose a novel acoustic localization system using commercial off-the-shelf (COTS) mobile devices. Acoustic-based systems have advantages in terms of accuracy and cost. However, the measurable positioning area is limited because of the signal attenuation and the poor performance of microphones embedded in COTS mobile devices. Our system leverages a transmission scheme that combines time-division multiple-access (TDMA) and frequency-division multiple-access (FDMA) techniques to address the limitation. In the proposed approach, each speaker transmits different band chirps in a predefined sequence to mitigate multiple-access interference. A COTS device receives modulated signals via a built-in microphone. We exploit the received signals and estimate the position by calculating time difference of arrival (TDoA). We were able to reduce the error to a 90th-percentile error of 46.26 cm at a measurement point that could not be estimated by FDMA-based positioning. The experiment results show that our system is more accurate and has a larger area of positioning capability compared with FDMA-based positioning.
