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The accuracy in location estimation of ad hoc deployed sensor nodes for a wireless sensor network in the presence of noisy environment and obstacle is discussed. Considering estimation accuracy, energy efficiency and range independency, the authors propose a localisation scheme using a mobile anchor node equipped with a directional antenna. Without increasing hardware and computational complexity, sensor nodes estimate their positions using the minimum number of beacon points. Each sensor node estimates its location based on the intersection point of the greatest gain direction of directional antenna. The proposed localisation scheme is verified using OPNET simulation software. The simulation results show that the proposed scheme has higher accuracy and energy efficiency than other localisation schemes.
Date of Publication: September 3 2010