A Verification-Based Localization Method for Unstable Radio Sensor Networks in Smart Home Environments

One of the key technologies of the ubiquitous sensor networks is localization. Most localization techniques nowadays apply ranging techniques to compute the location of the object wireless sensor network. Although the RSSI-based ranging technology is widely used and a cost-effective solution for localization in wireless sensor networks, a wireless ad hoc network is a fading signal environment that comprises noises. The noises cause RSSI to be unstable and lead to abrupt distance estimates. In this paper, we propose a Verification-Based Localization Method (VBLM) that determines whether a received signal is a noise. Our basic idea is that the unknown node uses another neighboring beacon to assist to verify the quality of received signal. The experimental results show that VBLM indeed reduces the localization error in the unstable radio sensor networks.