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We consider the problem of localizing a target taking the help of a set ofanchor beacon nodes.A small number of beacon nodes are deployed at knownlocations in the area.The target can detect a beacon provided it happens to liewithin the beacons's transmission range.Thus, the target contains a measurementvector containing the readings of the beacons: '1' corresponding to a beacon ifit is able to detect the target and '0' if the beacon is not able to detect thetarget.The goal is two fold: to determine the location of the target based onthe binary measurement vector at the target and to study the behavior of thelocalization uncertainty as a function of the beacon transmission range and thenumber of beacons deployed.Beacon transmission range means signal strength ofthe beacon to transmit and receive the signals which is called as ReceivedSignal Strength.To localize the target, we propose a grid mapping basedapproach, where the readings corresponding to locations on a grid overlaid on aregion of interest are used to localize a target.To study the behavior of thelocalization uncertainty as a function of the sensing radius and number ofbeacons,extensive simulations and numerical experiments are carried out.Theresults provide insights into an importance of optimally setting the sensingradius and the improvement obtainable with increasing number of beacons.

Target localization in wireless sensor networks based on received signal strength