An Improved Localization Scheme Based on Anchor Selection in Wireless Sensor Networks

In the previous work, we propose a node localization scheme based on three dimensional optimum space step distance in wireless sensor networks (WSNs) which is called 3D-OSSDL for short. By optimizing distances from the network model, the optimum space step distance from nodes to anchors is obtained and the coordinates of unknown nodes are derived finally. In this paper, in order to overcome the defects of OSSDL, an optimum anchor selection mechanism is added into it without inducing any extra requirements. Actually by using the optimum space step distance and optimum anchor selection, the whole scheme operates well and simulation results show better performances by 20%-30% than 3D-OSSDL on the localization error and much better than that of DV-Hop algorithm. In this paper comprehensive analysis about the mechanism is proposed and experiments prove the validity of it.