2nd International ICST Workshop on Advances in Wireless Sensor Networks 2007

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
Chunpeng Yan1, H. Howard Fan1
  • 1: ECE Department, University of Cincinnati Cincinnati, Ohio, USA

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.