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Mathematical Problems in Engineering
Volume 2014, Article ID 143938, 11 pages
Research Article

Neighbor Constraint Assisted Distributed Localization for Wireless Sensor Networks

School of Automation, Beijing Institute of Technology, Beijing 100081, China

Received 24 April 2014; Accepted 30 May 2014; Published 22 June 2014

Academic Editor: Jinhui Zhang

Copyright © 2014 Longfei Wen 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.


Localization is one of the most significant technologies in wireless sensor networks (WSNs) since it plays a critical role in many applications. The main idea in most localization methods is to estimate the sensor-anchor distances that are used by sensors to locate themselves. However, the distance information is always imprecise due to the measurement or estimation errors. In this work, a novel algorithm called neighbor constraint assisted distributed localization (NCA-DL) is proposed, which introduces the application of geometric constraints to these distances within the algorithm. For example, in the case presented here, the assistance provided by a neighbor will consist in formulating a linear equality constraint. These constraints can be further used to formulate optimization problems for distance estimation. Then through some optimization methods, the imprecise distances can be refined and the localization precision is improved.