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Mathematical Problems in Engineering
Volume 2013 (2013), Article ID 865983, 8 pages
http://dx.doi.org/10.1155/2013/865983
Research Article

Distributed Beacon Drifting Detection for Localization in Unstable Environments

1College of Computer Science and Technology, Zhejiang University of Technology, 288 Liuhe Road, Hangzhou 310023, China
2Department of IT and Management, Zhejiang Police Vocational Academy, No. 2 Street, Hangzhou 310018, China

Received 14 January 2013; Accepted 23 February 2013

Academic Editor: Shengyong Chen

Copyright © 2013 Ming Xia et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Localization is a fundamental research issue in wireless sensor networks (WSNs). In most existing localization schemes, several beacons are used to determine the locations of sensor nodes. These localization mechanisms are frequently based on an assumption that the locations of beacons are known. Nevertheless, for many WSN systems deployed in unstable environments, beacons may be moved unexpectedly; that is, beacons are drifting, and their location information will no longer be reliable. As a result, the accuracy of localization will be greatly affected. In this paper, we propose a distributed beacon drifting detection algorithm to locate those accidentally moved beacons. In the proposed algorithm, we designed both beacon self-scoring and beacon-to-beacon negotiation mechanisms to improve detection accuracy while keeping the algorithm lightweight. Experimental results show that the algorithm achieves its designed goals.