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International Journal of Distributed Sensor Networks
Volume 2012 (2012), Article ID 213980, 7 pages
http://dx.doi.org/10.1155/2012/213980
Research Article

Improved DV-Hop Node Localization Algorithm in Wireless Sensor Networks

School of Electronic and Information Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China

Received 3 May 2012; Revised 26 June 2012; Accepted 19 July 2012

Academic Editor: Shashi Phoha

Copyright © 2012 Xiao Chen and Benliang Zhang. 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

An improved algorithm is put forward to improve the poor locating performance of the DV-Hop algorithm, which is one of the range-free algorithms in wireless sensor networks. Firstly, we set some anchor nodes at the border land of monitoring regions. Secondly, the average one-hop distance between anchor nodes is modified, and the average one-hop distance used by each unknown node for estimating its location is modified through weighting the received average one-hop distances from anchor nodes. Finally, we use the particle swarm optimization to correct the position estimated by the 2D hyperbolic localization algorithm, which makes the result closer to the actual position. The simulation results show that the proposed algorithm has better localization performance in the localization precision and stability than the basic DV-Hop algorithm and some existing improved algorithms.