Positioning system for emergency situation based on RSSI measurements for WSN

In this paper, we present a technique for indoor localization that uses the results of the Trilateration method and RSSI signal strength to know what is expected in specific locations. Indoor positioning in systems confronts particular problems of precision. This study aims to implement a technical solution that can precisely and efficiently give the position of a target and facilitate the localization of mobile nodes deployed in a given zone. The main objective of this work is to estimate the position of the node with precision. This work was conducted on the basis of the combination of two concepts: trilateration method and RSSI measurement in different positions. The study of a set of simulations indicates that the estimation of the node position; using RSSI level; does not differ from mathematical calculations used by trilateration method. Besides; the network performance is not affected significantly. This is the major concern of our work; mainly in emergency situations; as it gives the right position of individuals to the rescuers.