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Carrier-phase time transfer.

K M Larson1, J Levine

  • 1Dept. of Aerosp. Eng. Sci., Colorado Univ., Boulder, CO.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|February 2, 2008
PubMed
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We developed a new GPS carrier-phase time transfer method. This technique offers significantly higher precision than current GPS systems, improving atomic clock synchronization.

Area of Science:

  • Geodesy
  • Metrology
  • Satellite Navigation

Background:

  • Current Global Positioning System (GPS) time transfer relies on code-based measurements.
  • Existing methods have limitations in precision and accuracy for advanced synchronization needs.

Purpose of the Study:

  • To introduce and evaluate a novel time transfer method utilizing GPS carrier-phase observations.
  • To assess the precision and stability of GPS carrier-phase time transfer compared to existing techniques.

Main Methods:

  • Connected atomic clocks to geodetic GPS receivers.
  • Utilized GPS carrier-phase observations for time transfer at 6-minute intervals.
  • Compared results with GPS common view and two-way satellite time transfer.

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Main Results:

  • GPS carrier-phase time transfer demonstrated over an order of magnitude improvement in precision.
  • Measurements agreed with two-way satellite time transfer over a 2400 km baseline.
  • Achieved a stability of 100 picoseconds, yielding a frequency uncertainty of ~2x10⁻¹⁵.

Conclusions:

  • GPS carrier-phase time transfer is a highly precise and stable method for synchronizing atomic clocks.
  • This technique offers a significant advancement over traditional GPS code-based time transfer.
  • Potential applications in geodesy, telecommunications, and fundamental physics research.