Autonomous localization scheme for mobile sensor networks in fading environments

摘要

Sensor localization based on Received Signal Strength Indication (RSSI) in Wireless Sensor Networks (WSNs) takes a place in research interest because received signal strength can be measured without additional hardware. However, RSSI based localization requires static configuration for anchor nodes to achieve high localization accuracy in reasonable time. Furthermore, when sufficient number of mobile nodes are chosen as anchors, RSSI based localization accuracy is radically influenced by measurement errors of signal strength in physical environments. As a result, RSSI based localization error may increase due to anchor mobility such as a case of close anchors and a case of approximately linear anchors. In this paper, a new localization scheme is proposed to solve such problems. In addition, the proposed scheme is enhanced to work in low anchor density to minimize additional equipment cost for anchor nodes. Performance comparison and simulation results show that the proposed scheme achieves better localization accuracy in fading environments (i.e. urban, suburban or rural) compared to existing RSSI solutions.