NDLI: Challenges for RF two-way time-of-flight ranging in Wireless Sensor Networks

Content Provider	IEEE Xplore Digital Library
Author	Bader, S. Oelmann, B. Brunig, M.
Copyright Year	2012
Description	Author affiliation: Autonomous Systems Laboratory, ICT Centre, CSIRO, Brisbane, Australia (Brunig, M.) \|\| Department of Information Technology and Media, Mid Sweden University, Sundsvall, Sweden (Bader, S.; Oelmann, B.)
Abstract	In applications where a priori determination of location is infeasible, node localization schemes are desirable, which allow the node to estimate its location during network operation. The majority of these schemes are based on ranging between node pairs, which should ideally be performed without adding cost or size to the sensor node. Two-way time-of-flight schemes can fulfill this desire, by utilizing the measurement of the time-of-flight of electromagnetic waves to determine the distance between two sensor nodes. In this paper, we present the implementation and analysis of such a ranging scheme. Because a small error in time measurement can result in a large distance estimation error, the focus of this work lies on the determination and analysis of influencing factors, which limit the accuracy of round-trip-time measurements. We analyze two main contributing factors to the accuracy of the ranging scheme, namely the radio transceiver clock quantization and the link quality during round-trip-time measurement. These effects and their impact on the overall ranging error have been investigated by means of simulation and experimentation. Initial ranging errors as large as 24 m RMS were observed, which could be reduced to errors between 5 and 8 m RMS by utilizing compensation techniques.
Starting Page	908
Ending Page	916
File Size	456968
Page Count	9
File Format	PDF
ISBN	9781467321303
e-ISBN	9781467321297
DOI	10.1109/LCNW.2012.6424081
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-10-22
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radio frequency Wireless sensor networks Accuracy Distance measurement Delay Clocks
Content Type	Text
Resource Type	Article

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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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