NDLI: Robust time-based localization for asynchronous networks with clock offsets

Content Provider	IEEE Xplore Digital Library
Author	Yiyin Wang Xiaoli Ma Leus, G.
Copyright Year	2011
Description	Author affiliation: School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, 30332-0250, USA (Xiaoli Ma) \|\| Faculty of Electrical Engineering, Mathematics, and Computer Science, Delft University of Technology, Mekelweg 4, 2628CD, The Netherlands (Yiyin Wang; Leus, G.)
Abstract	Localization is indispensable for the successful deployment of wireless sensor networks (WSNs). Time-based localization approaches attract a lot of interest due to their high accuracy and potentially low cost. However, time-based localization is intensively coupled with clock synchronization. Thus, the reliability of timestamps in the time-based localization becomes an important yet challenging task to deal with. In this paper, we propose a robust time-based localization approach to locate a target node with the assistance of anchors (nodes with known positions) in an asynchronous network with clock offsets. We employ the asymmetric trip ranging (ATR) protocol to obtain time-of-arrival (TOA) measurements and facilitate clock offset cancellation. Regardless of the reliability of the timestamp report from the target node, closed-form least-squares (LS) and weighted LS estimators are derived to accurately estimate the target node position. As a result, we counter the uncertainties caused by the target node by ignoring the timestamps from this node. Furthermore, Cramér-Rao Bounds (CRBs) and simulation results corroborate the efficiency of our localization scheme.
Starting Page	1513
Ending Page	1518
File Size	224517
Page Count	6
File Format	PDF
ISBN	9781467303217
ISSN	10586393
e-ISBN	9781467303231
DOI	10.1109/ACSSC.2011.6190271
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-11-06
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Clocks Protocols Distance measurement Synchronization Robustness Delay Wireless sensor networks two-way ranging Localization synchronization clock offset least squares
Content Type	Text
Resource Type	Article
Subject	Signal Processing Computer Networks and Communications

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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