optimizing the event-based method of localization in wireless sensor networks

a wireless sensor network (wsn) is a wireless decentralized structure network consists of many nodes. nodes can be fixed or mobile. wsn applications typically observe some physical phenomenon through sampling of the environment so determine the location of events is an important issue in wsn. wireless localization used to determine the position of nodes. the precise localization in wsns is a complex issue that requires consideration of many prominent aspects such as energy consumption at the nodes as well as the algorithm execution time. in this article, we optimize a system called spotlight. the spotlight is a localization system that delivers high-location estimation accuracy at low cost. we propose several methods to reduce execution time compared with previous methods in spotlight. we proposed ils, las and pas methods that improve execution time about 25%, 50% and 75%. execution time of the proposed scheme is restricted by the size of deployment area. furthermore, in these methods, there is no need to equip the nodes with any special hardware.