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Cosmic time calibrator for wireless sensor network.

Hiroyuki K M Tanaka1,2

  • 1University of Tokyo, Tokyo, Japan. ht@eri.u-tokyo.ac.jp.

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Summary
This summary is machine-generated.

Wireless sensor networks (WSNs) achieve precise time synchronization using a novel Cosmic Time Calibrator (CTC). This method leverages cosmic-ray muons for reliable, high-precision clock resynchronization, overcoming limitations of traditional RF signals.

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Area of Science:

  • Electrical Engineering
  • Computer Science
  • Physics

Background:

  • Accurate time synchronization is essential for wireless sensor networks (WSNs).
  • Existing radio frequency (RF) based synchronization methods are environment-dependent and have limited precision.
  • GPS and land-based RF schemes face limitations in obstructed environments and offer microsecond precision.

Purpose of the Study:

  • To introduce and evaluate a versatile, new recurrent clock resynchronization scheme called Cosmic Time Calibrator (CTC).
  • To demonstrate CTC's capability to overcome the environmental limitations of RF-based synchronization.
  • To assess the feasibility of using cosmic-ray muons for precise time transfer in WSNs.

Main Methods:

  • Developed and tested the Cosmic Time Calibrator (CTC) system.
  • Utilized cosmic-ray muons, which are highly penetrative and travel linearly at near light speed, for time signal transfer.
  • Minimized reliance on traditional inter-nodal communication devices like Wi-Fi or Bluetooth.

Main Results:

  • Achieved a resynchronization frequency of 60 Hz.
  • Demonstrated a high precision of ±4.3 ns (S.D.) for clock resynchronization.
  • Experimental results confirm the viability of muon-based time transfer.

Conclusions:

  • The Cosmic Time Calibrator (CTC) offers a robust and precise alternative for WSN time synchronization.
  • CTC enables WSN applications in a wider range of environments, including those unsuitable for RF or GPS.
  • CTC facilitates the development of critical WSN applications, such as structural health monitoring in aerospace structures.