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Information Technology Journal

Year: 2011  |  Volume: 10  |  Issue: 2  |  Page No.: 239 - 245

Cosine Theorem-based DV-Hop Localization Algorithm in Wireless Sensor Networks

Haibo Wu, Musheng Deng, Liaoliang Xiao, Wei Wei and Ang Gao

Abstract

Localization is significant for various applications in Wireless Sensor Networks. It is found that the estimated hop-distance will affect localization result. In this study, we propose a Cosine Theorem-based DV-hop localization algorithm (CTDV-hop) to improve localization precision. After estimating the average hop-distance by the traditional DV-hop technique, we select the middle node between every two anchor-pairs in the transmission route one by one. Then the estimated hop-distance is adjusted by the angle between the anchor-pairs to that selected middle node. We hence obtain the improved localization results and can accurately locate even the distribution of nodes is non-uniform. The simulation results illustrate that the CTDV-hop algorithm effectively improves the localization precision without extra energy consumption in networks.

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