Computational geometry: algorithms and applications
Computational geometry: algorithms and applications
Fine-grained network time synchronization using reference broadcasts
ACM SIGOPS Operating Systems Review - OSDI '02: Proceedings of the 5th symposium on Operating systems design and implementation
Timing-sync protocol for sensor networks
Proceedings of the 1st international conference on Embedded networked sensor systems
Robust distributed network localization with noisy range measurements
SenSys '04 Proceedings of the 2nd international conference on Embedded networked sensor systems
Directed flood-routing framework for wireless sensor networks
Proceedings of the 5th ACM/IFIP/USENIX international conference on Middleware
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This paper presents the hierarchical sensor network system for robust localization. This system consists of parent nodes with a low priced L1 GPS receiver and child nodes equipped with an acoustic ranging device. Relative positions between child nodes are estimated based on acoustic ranging through the inverse Delaunay algorithm. This algorithm localizes all the nodes simultaneously, thus, the accumulation of the error in the localization is suppressed. Relatively localized child sensor nodes are given global coordinates with the help of GPS on parent nodes. Field experiment was conducted with three GPS parent nodes and twenty-one child nodes (MOTE).