Marks, M; Niewiadomska-Szynkiewicz, E
The paper treats the problem of localization in Wireless Sensor Network (WSN). In our work, we present and evaluate the localization system that can be used to calculate the geographical positions of network nodes. The search for the accurate positions of nodes is performed using a signal strength measurements and known positions of a set of selected sensors equipped with GPS system. Our scheme uses node to node distance estimates calculated based on RSSI (Received Signal Strength Indicator). The proposed solution is self-adaptive, since the transformation of RSSI measurements into distances is done automatically using information about strength of signals received by nodes equipped with GPS. We focus on the performance of our approach to localization, and discuss the accuracy of position calculation for various methods of inter-node distances estimation. The use and efficiency of the proposed localization system is illustrated by numerical examples performed in our WSN Localization Simulator.