Enhancing Localization Accuracy in Wireless Sensor Networks using Range-free methods and RSS Measurements

Abstract

Localization is a significant feature in the area of wireless sensor networks (WSNs). Localization is computed through relation between localized node and unlocalized node for examining their physical placement or location. Location can be calculated by means of distance or length and angle between nodes. To find the position of the node, we should find the distance between the anchor nodes (sensor nodes with known locations i.e., localized node) and unlocalized nodes. Distance and angle calculated for the sensors is used to estimate the location of the nodes individually and they directly communicate with anchor nodes. Anchor nodes are used because localization is a crucial procedure for randomly deployed wireless sensor networks. So, localization depends on anchor nodes to automatically acquire their positions in global coordinates. Based on the non-collaborative approach, the sensor nodes cannot position themselves if they are not directly connected to a available number of known anchor nodes, which might be hard as the communication range is less and inaccessible anchor nodes. So, in order to significantly enhance the localization accuracy, mobility aided localization problems are investigated in non-stationary cooperative WSNs. To overcome this problem, we have proposed the mobility-aided localization framework using the range-free methods and Received Signal Strength (RSS) measurement techniques, to enhance the localization accuracy.