Research Article
Asynchronous Self-Localization of Sensor Networks with Large Clock Drif
@INPROCEEDINGS{10.1109/MOBIQ.2007.4451038, author={ Chunpeng Yan and H. Howard Fan}, title={Asynchronous Self-Localization of Sensor Networks with Large Clock Drif}, proceedings={2nd International ICST Workshop on Advances in Wireless Sensor Networks 2007}, publisher={IEEE}, proceedings_a={IWASN}, year={2008}, month={2}, keywords={Circuits Clocks Delay Frequency synchronization Maximum likelihood estimation Radio frequency Signal processing Time difference of arrival Timing Wireless sensor networks}, doi={10.1109/MOBIQ.2007.4451038} }- Chunpeng Yan
H. Howard Fan
Year: 2008
Asynchronous Self-Localization of Sensor Networks with Large Clock Drif
IWASN
IEEE
DOI: 10.1109/MOBIQ.2007.4451038
Abstract
Large clock offsets and drifts impose many difficulties on sensor self-localization. We have proposed a differential time-difference-of-arrival (dTDOA) localization method in [1] to overcome the problem caused by asynchronous clock offsets. In this paper, the dTDOA method is extended to combat clock drifts by a two-stage clock-drift cancellation method. Furthermore, based on the clock-drift cancellation, a maximum likelihood estimation (MLE) method that is theoretically optimal for sensor locations is derived. The method can achieve sensor localization using a single round of time-of-arrival (TOA) measurements, and thus greatly reduces the communications burden and timing constraint.
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