Direction-aware, audio-based pedestrian relative positioning by swing induced Doppler shift

Liang Wang, Tao Gu, Xianping Tao, Jian Lu

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

Abstract

In this paper, we study the problem of pedestrian relative positioning with respect to their walking direction. Existing approaches are mainly based on trajectory information or device proximity detection, and they highly rely on infrastructure or specialized device support. Importantly, most work does not provide relative position information with respect to people’s walking direction. To address the above issues, we propose a direction-aware, audio-based solution that only uses daily wearable devices. Based on the fact that pedestrian’s arms often swing back and forth during walking, we develop the wrist-body model that formally models the distance change between a user’s wrist and his/her walking mate’s body when walking together. Based on this model, we design our system by attaching the audio sources to a user’s wrists and an audio receiver to the other user’s body. We develop key indicators that characterize the received audio signal’s Doppler shift induced by arm swing motions and the differences in signal strength. We further propose methods such as cycle segmentation and aggregation to deal with several real-world challenges. The performance of our approach is studied through extensive experiments. Evaluation conducted using real-world data suggests the prototype system achieves 85.9% positioning accuracy, demonstrating its effectiveness.

Original languageEnglish
Title of host publicationProceedings of the 14th EAI International Conference on Mobile and Ubiquitous Systems: Computing, Networking and Services (MobiQuitous 2017)
Place of PublicationNew York, NY
PublisherAssociation for Computing Machinery (ACM)
Pages86-95
Number of pages10
ISBN (Print)9781450353687
DOIs
Publication statusPublished - 2017
Externally publishedYes
Event14th EAI International Conference on Mobile and Ubiquitous Systems: Computing, Networking and Services, MobiQuitous 2017 - Melbourne, Australia
Duration: 7 Nov 201710 Nov 2017

Publication series

NameACM International Conference Proceeding Series

Conference

Conference14th EAI International Conference on Mobile and Ubiquitous Systems: Computing, Networking and Services, MobiQuitous 2017
CountryAustralia
CityMelbourne
Period7/11/1710/11/17

Keywords

  • Smartphone and Smartwatch
  • Relative Positioning
  • Audio
  • Doppler Shift

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