Minimizing Localization Error in Wireless Sensor Networks

Abstract- Se nsor localization has be come an esse ntial requirement for realistic applications ove r Wire less Sensor Networks (WSNs). As s uch localization sche me designed for mobile sensor networks is necessary. He re the objective is to des ign a localization s che me to improve the localization accuracy by u ing localization scheme Improve d Monte-Carlo Localization (IMCL). In this method, all se ns or nodes are mobile, normal node collects the locations of its one-hop and t wo-hop anchor nodes via mess age exchange, and constructs a ne w possible location se t in e ach time s lot where the normal node may locate. The normal nodes without location information can estimate the ir own locations by gathering the positions of location-aware nodes (anchor nodes) and the one- hop normal nodes whose locations are estimate d from t he anchor nodes. In e ach time s lot e ach normal node executes these three phases once and gets its estimate d location. Our simulation result shows that the localization error using this scheme is lowe r than t he previous schemes such as MCL, MSL and bounded box schemes unde r various mobilit y mode ls and moving speeds