Dynamic fine-grained localization in Ad-Hoc networks of sensors
Proceedings of the 7th annual international conference on Mobile computing and networking
Wireless sensor networks for habitat monitoring
WSNA '02 Proceedings of the 1st ACM international workshop on Wireless sensor networks and applications
Range-free localization schemes for large scale sensor networks
Proceedings of the 9th annual international conference on Mobile computing and networking
Rendered path: range-free localization in anisotropic sensor networks with holes
Proceedings of the 13th annual ACM international conference on Mobile computing and networking
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Nowadays, wireless sensor network can be widely used in the military field, precision agriculture, environmental monitoring[1], intelligent home environment, urban transport and so on. As a core support technology of it, self-location node technology is the basis of most practical applications in WSN. Sensor's self-location methods can mainly be divided into two categories: range-based algorithm and range-free algorithm. In this paper, taking into account of the low positioning accuracy in the location-free APIT algorithm as a result of the sparse anchor nodes, we bring forward an improved APIT algorithm based on the direction searching. Simulation results show that by searching for the reliable direction, compared with the original APIT algorithm, the improved one can significantly improve positioning accuracy, with a higher reference value.