Anchor-Pairs Conditional Decision-Based Node Localization for Anisotropic Wireless Sensor Networks

In order to improve the localization accuracy in anisotropic wireless sensor networks (WSNs) with coverage holes, a range-free localization algorithm based on anchor pairs condition decision is proposed in this paper. The anchor pair selection strategy is employed to seek the reliable anchor pairs, which are termed as the optimal and sub-optimal anchor pairs. For the former type of pairs, the expected distance between sensor node and anchor is derived to acquire an estimation of high accuracy. For the latter, a distance estimation approach utilizing average hop progress is proposed to enhance the utilization of anchors. Simulations over anisotropic networks indicate that the proposed scheme outperforms other algorithms of interest in term of localization accuracy.