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A Two-Way Time of Flight Ranging Scheme for Wireless Sensor Networks

A Two-Way Time of Flight Ranging Scheme for Wireless Sensor Networks
A Two-Way Time of Flight Ranging Scheme for Wireless Sensor Networks
Relative ranging between Wireless Sensor Network (WSN) nodes is considered to be an important requirement for a number of distributed applications. This paper focuses on a two-way, time of flight (ToF) technique which achieves good accuracy in estimating the point-to-point distance between two wireless nodes. The underlying idea is to utilize a two-way time transfer approach in order to avoid the need for clock synchronization between the participating wireless nodes. Moreover, by employing multiple ToF measurements, sub-clock resolution is achieved. A calibration stage is used to estimate the various delays that occur during a message exchange and require subtraction from the initial timed value. The calculation of the range between the nodes takes place on-node making the proposed scheme suitable for distributed systems. Care has been taken to exclude the erroneous readings from the set of measurements that are used in the estimation of the desired range. The two-way ToF technique has been implemented on commercial off-the-self (COTS) devices without the need for additional hardware. The system has been deployed in various experimental locations both indoors and outdoors and the obtained results reveal that accuracy between 1 m RMS and 2.5 m RMS in line-of-sight conditions over a 42 m range can be achieved.
0302-9743
163-178
Mazomenos, Evangelos
23983827-c7e7-4ee1-bfc8-986aa3594279
De Jager, Dirk
b8ffaecd-3398-4220-9f8a-df0634a4d9a7
Reeve, Jeff
dd909010-7d44-44ea-83fe-a09e4d492618
White, Neil
c7be4c26-e419-4e5c-9420-09fc02e2ac9c
Marron, Pedro Jose
92cb9bcb-2ec4-4b44-8dc1-cfd7a79c90f7
Whitehouse, Kamin
ceeeebac-d426-49c8-aa20-19a2c8f3ed49
Mazomenos, Evangelos
23983827-c7e7-4ee1-bfc8-986aa3594279
De Jager, Dirk
b8ffaecd-3398-4220-9f8a-df0634a4d9a7
Reeve, Jeff
dd909010-7d44-44ea-83fe-a09e4d492618
White, Neil
c7be4c26-e419-4e5c-9420-09fc02e2ac9c
Marron, Pedro Jose
92cb9bcb-2ec4-4b44-8dc1-cfd7a79c90f7
Whitehouse, Kamin
ceeeebac-d426-49c8-aa20-19a2c8f3ed49

Mazomenos, Evangelos, De Jager, Dirk, Reeve, Jeff and White, Neil, Marron, Pedro Jose and Whitehouse, Kamin(eds.) (2011) A Two-Way Time of Flight Ranging Scheme for Wireless Sensor Networks Lecture Notes in Computer Science, 6567, pp. 163-178.

Record type: Article

Abstract

Relative ranging between Wireless Sensor Network (WSN) nodes is considered to be an important requirement for a number of distributed applications. This paper focuses on a two-way, time of flight (ToF) technique which achieves good accuracy in estimating the point-to-point distance between two wireless nodes. The underlying idea is to utilize a two-way time transfer approach in order to avoid the need for clock synchronization between the participating wireless nodes. Moreover, by employing multiple ToF measurements, sub-clock resolution is achieved. A calibration stage is used to estimate the various delays that occur during a message exchange and require subtraction from the initial timed value. The calculation of the range between the nodes takes place on-node making the proposed scheme suitable for distributed systems. Care has been taken to exclude the erroneous readings from the set of measurements that are used in the estimation of the desired range. The two-way ToF technique has been implemented on commercial off-the-self (COTS) devices without the need for additional hardware. The system has been deployed in various experimental locations both indoors and outdoors and the obtained results reveal that accuracy between 1 m RMS and 2.5 m RMS in line-of-sight conditions over a 42 m range can be achieved.

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Published date: 23 February 2011
Organisations: EEE

Identifiers

Local EPrints ID: 272051
URI: http://eprints.soton.ac.uk/id/eprint/272051
ISSN: 0302-9743
PURE UUID: 460ff756-8c17-42f5-b07c-8aa8b334d51f
ORCID for Neil White: ORCID iD orcid.org/0000-0003-1532-6452

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Date deposited: 21 Feb 2011 17:24
Last modified: 18 Jul 2017 06:35

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Contributors

Author: Evangelos Mazomenos
Author: Dirk De Jager
Author: Jeff Reeve
Author: Neil White ORCID iD
Editor: Pedro Jose Marron
Editor: Kamin Whitehouse

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