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The Scientific World Journal
Volume 2014, Article ID 219371, 13 pages
http://dx.doi.org/10.1155/2014/219371
Research Article

A Mobile Anchor Assisted Localization Algorithm Based on Regular Hexagon in Wireless Sensor Networks

1Department of Information & Communication Systems, Hohai University, Changzhou 213022, China
2Guangdong Provincial Key Lab of Petrochemical Equipment Fault Diagnosis, Guangdong University of Petrochemical Technology, Maoming 525000, China
3Integrated Management Coastal Research Institute, Universidad Politecnica de Valencia, 46000 Valencia, Spain
4Instituto de Telecomunicações, University of Beira Interior, 6201-001 Covilhã, Portugal

Received 17 April 2014; Accepted 28 May 2014; Published 13 July 2014

Academic Editor: Zhongmei Zhou

Copyright © 2014 Guangjie Han 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 one of the key technologies in wireless sensor networks (WSNs), since it provides fundamental support for many location-aware protocols and applications. Constraints of cost and power consumption make it infeasible to equip each sensor node in the network with a global position system (GPS) unit, especially for large-scale WSNs. A promising method to localize unknown nodes is to use several mobile anchors which are equipped with GPS units moving among unknown nodes and periodically broadcasting their current locations to help nearby unknown nodes with localization. This paper proposes a mobile anchor assisted localization algorithm based on regular hexagon (MAALRH) in two-dimensional WSNs, which can cover the whole monitoring area with a boundary compensation method. Unknown nodes calculate their positions by using trilateration. We compare the MAALRH with HILBERT, CIRCLES, and S-CURVES algorithms in terms of localization ratio, localization accuracy, and path length. Simulations show that the MAALRH can achieve high localization ratio and localization accuracy when the communication range is not smaller than the trajectory resolution.