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.
