Ranging error-tolerable localization in wireless sensor networks with inaccurately positioned anchor nodes

Authors:
Rongfei Fan;Hai Jiang;Shaohua Wu;Naitong Zhang
Affiliations:
Department of Electrical and Computer Engineering, University of Alberta, Canada;Department of Electrical and Computer Engineering, University of Alberta, Canada;School of Electronics and Information Technology, Harbin Institute of Technology, P.R. China;School of Electronics and Information Technology, Harbin Institute of Technology, P.R. China
Venue:
Wireless Communications & Mobile Computing
Year:
2009

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Abstract

Localization is essential for wireless sensor networks (WSNs). It is to determine the positions of sensor nodes based on incomplete mutual distance measurements. In this paper, to measure the accuracy of localization algorithms, a ranging error model for time of arrival (TOA) estimation is given, and the Cramer—Rao Bound (CRB) for the model is derived. Then an algorithm is proposed to deal with the case where (1) ranging error accumulation exists, and (2) some anchor nodes broadcast inaccurate-wrong location information. Specifically, we first present a ranging error-tolerable topology reconstruction method without knowledge of anchor node locations. Then we propose a method to detect anchor nodes whose location information is inaccurate-wrong. Simulations demonstrate the effectiveness of our algorithm. Copyright © 2008 John Wiley & Sons, Ltd.