Improving APS with Anchor Selection in Anisotropic Sensor Networks

Authors:
King-Yip Cheng;Vincent Tam;King-Shan Lui
Affiliations:
University of Hong Kong;University of Hong Kong;University of Hong Kong
Venue:
ICAS-ICNS '05 Proceedings of the Joint International Conference on Autonomic and Autonomous Systems and International Conference on Networking and Services
Year:
2005

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Abstract

Sensor networks are useful for environmental monitoring, military applications, disaster management, etc. In many applications, sensors are supposed to know their geographic locations. Some localization methods of sensor networks have been developed. In these methods, nodes equipped with special hardware to obtain precise location information, namely the anchor nodes, are employed to derive the locations of other nodes. Most of the existing work focus on increasing the accuracy in position estimation by using different heuristic-based or mathematical techniques. In this paper, we show that selection of anchor nodes is a significant factor to the problem. We first demonstrate that using all anchor nodes does not give the most precise position. We then identify criteria of selecting "good" anchor nodes to achieve more accurate position estimation in anisotropic sensor networks. We develop a simple heuristicbased algorithm to select "good" anchor nodes and evaluate its performance using simulations.