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Contour-based Trilateration for Indoor Fingerprinting Localization

Published: 01 November 2015 Publication History

Abstract

Trilateration has been widely and successfully employed to locate outdoor mobile devices due to its accuracy. However, it cannot be directly applied for indoor localization due to issues such as non-line-of-sight measurement and multipath fading. Though fingerprinting overcomes these issues, its accuracy is often hampered by signal noise and the choice of similarity metric between signal vectors. We propose INTRI, a novel, simple and effective indoor localization technique combining the strengths of trilateration and fingerprinting.
For a signal level received from an access point (AP) by the target, INTRI first forms a contour consisting of all the reference points (RPs) of the same signal level for that AP, taking into account the signal noise. The target is hence at the juncture of all the contours. With an optimization formulation following the spirit of trilateration, it then finds the target location by minimizing the distance between the position and all the contours. INTRI further uses an online algorithm based on signal correlation to efficiently calibrate heterogeneous mobile devices to achieve higher accuracy. We have implemented INTRI, and our extensive simulation and experiments in an international airport, a shopping mall and our university campus show that it outperforms recent schemes with much lower location error (often by more than 20%).

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      cover image ACM Conferences
      SenSys '15: Proceedings of the 13th ACM Conference on Embedded Networked Sensor Systems
      November 2015
      526 pages
      ISBN:9781450336314
      DOI:10.1145/2809695
      Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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      Publication History

      Published: 01 November 2015

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      Author Tags

      1. contour-based trilateration
      2. device calibration
      3. fingerprinting
      4. indoor localization
      5. linear programming.
      6. signal contour

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      Funding Sources

      • The Hong Kong R&D Center for Logistics and Supply Chain Management Enabling Technologies
      • Hong Kong Research Grant Council (RGC) General Research Fund

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      SenSys '15 Paper Acceptance Rate 27 of 132 submissions, 20%;
      Overall Acceptance Rate 174 of 867 submissions, 20%

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      Cited By

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      • (2024)Robust Indoor LocalizationLocation, Localization, and Localizability10.1007/978-981-97-3176-3_8(131-162)Online publication date: 12-Jul-2024
      • (2023)The Wisdom of 1,170 Teams: Lessons and Experiences from a Large Indoor Localization CompetitionProceedings of the 29th Annual International Conference on Mobile Computing and Networking10.1145/3570361.3592507(1-15)Online publication date: 2-Oct-2023
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      • (2021)Multi-Floor Indoor Localization Based on RBF Network With Initialization, Calibration, and UpdateIEEE Transactions on Wireless Communications10.1109/TWC.2021.308920220:12(7977-7991)Online publication date: Dec-2021
      • (2021)GraphIPS: Calibration-Free and Map-Free Indoor Positioning Using Smartphone Crowdsourced DataIEEE Internet of Things Journal10.1109/JIOT.2020.30047038:1(393-406)Online publication date: 1-Jan-2021
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