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International Journal of Distributed Sensor Networks
Volume 2013 (2013), Article ID 958912, 18 pages
http://dx.doi.org/10.1155/2013/958912
Research Article

A Novel Lightness Localization Algorithm Based on Anchor Nodes Equilateral Triangle Layout in WSNs

College of Information Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China

Received 24 July 2012; Revised 13 November 2012; Accepted 10 December 2012

Academic Editor: Wei Meng

Copyright © 2013 Dazhou Li 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, which determines the geographical locations of sensors, is a crucial issue in wireless sensor networks. In this paper, we propose a novel lightweight equilateral triangle localization algorithm (LETLA) that accurately localizes sensors and minimizes the power consumption. In the LETLA, the approximate coordinates substituted for the real coordinates of the unknown node, and the corresponding optimization problem is formulated to minimize the estimation error. With the sequences that represent the ranking of distances from the anchors to the unknown node, a simple and robust technique is developed to quickly and efficiently estimate a region containing the approximate coordinates, and a condition under which the approximate error can be minimized is given. This condition employs a new geometric construct of anchor layout called equilateral triangle diagrams. Extensive simulations show that the LETLA performs better than other state-of-the-art approaches in terms of energy consumption with the same localization precision.