STUDY ON RANGE FREE LOCALIZATION IN WIRELESS SENSOR NETWORK (WSN)

Abstract

The position accuracy of range free localization is a vital problem in Wireless Sensor Networks (WSNs). The accuracy of the localization procedure seriously impacts the performance of the localization dependent protocols and applications, such as moving and storage. Most of the range free localization procedures are designed by assuming that the sensor nodes are deployed in systematic areas without any problems. This assumption doesn’t reflect the real world conditions especially for outdoor deployment of WSN. In this paper we propose a novel scheme called Range Free Angle Calculation (RFAC) based sensor localization in WSNs, which can significantly reduce the localization error in the irregular deployment areas. We estimate the average hop distance by selecting the middle of the transmission path between every two anchor pairs single by single. Then the estimated hop distance is adjusted by the position between the anchor pairs to that certain middle point. The simulation effects show that RFAC achieves significant development in localization accuracy in anisotropic WSNs.