Continental-scale clock calibration
Ye-Sheng Kuo, Prabal Dutta

Citation
Ye-Sheng Kuo, Prabal Dutta. "Continental-scale clock calibration". Talk or presentation, 5, November, 2013; Poster presented at the 2013 TerraSwarm Annual Meeting.

Abstract
Having a common clock at swarm nodes is desirable for coordination and energy-efficient communication in low-duty-cycle system. Radio based solutions include GPS or WWVB require an extra wireless radio which draws mA. Other alternative is ambient 60 Hz signal in indoor environment. 60 Hz AC voltage is phase and frequency locked in large scale. Thus, 60 Hz phase information is an ideal "global clock" for indoor nodes. We present a system extracts the phase information of ambient 60 Hz wirelessly. The system draws 7 uA at 3 V and startup time is less than 50 ms. The system provides a highly stable clock for nodes to calibrate its local oscillator.

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Citation formats

• HTML

  Ye-Sheng Kuo, Prabal Dutta. <a
  href="http://www.terraswarm.org/pubs/199.html"><i>Continental-scale
  clock calibration</i></a>, Talk or presentation,
   5, November, 2013; Poster presented at the <a
  href="http://www.terraswarm.org/conferences/13/annual"
  >2013 TerraSwarm Annual Meeting</a>.

• Plain text

  Ye-Sheng Kuo, Prabal Dutta. "Continental-scale clock
  calibration". Talk or presentation,  5, November, 2013;
  Poster presented at the <a
  href="http://www.terraswarm.org/conferences/13/annual"
  >2013 TerraSwarm Annual Meeting</a>.

• BibTeX

  @presentation{KuoDutta13_ContinentalscaleClockCalibration,
      author = {Ye-Sheng Kuo and Prabal Dutta},
      title = {Continental-scale clock calibration},
      day = {5},
      month = {November},
      year = {2013},
      note = {Poster presented at the <a
                href="http://www.terraswarm.org/conferences/13/annual"
                >2013 TerraSwarm Annual Meeting</a>.},
      abstract = {Having a common clock at swarm nodes is desirable
                for coordination and energy-efficient
                communication in low-duty-cycle system. Radio
                based solutions include GPS or WWVB require an
                extra wireless radio which draws mA. Other
                alternative is ambient 60 Hz signal in indoor
                environment. 60 Hz AC voltage is phase and
                frequency locked in large scale. Thus, 60 Hz phase
                information is an ideal "global clock" for indoor
                nodes. We present a system extracts the phase
                information of ambient 60 Hz wirelessly. The
                system draws 7 uA at 3 V and startup time is less
                than 50 ms. The system provides a highly stable
                clock for nodes to calibrate its local oscillator.},
      URL = {http://terraswarm.org/pubs/199.html}
  }
  

Posted by Ye-Sheng Kuo on 12 Nov 2013.