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Continuous time transfer using GPS carrier phase.

Rolf Dach1, Thomas Schildknecht, Tim Springer

  • 1Astronomical Institute, University Bern, Switzerland. dach@aiub.unibe.ch

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|December 18, 2002
PubMed
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A new method concatenates daily GPS time transfer solutions, creating a continuous series. This approach improves timekeeping accuracy by better reflecting clock performance compared to daily analyses.

Area of Science:

  • Geodesy and Geophysics
  • Time and Frequency Transfer
  • Satellite Navigation Systems

Background:

  • The Astronomical Institute of the University of Berne operates as an Analysis Center for the International GPS Service (IGS).
  • Routine analysis of GPS station networks in Europe and North America is performed for time transfer, utilizing carrier phase observations.
  • This research is conducted in collaboration with the Swiss Federal Office of Metrology and Accreditation (METAS).

Purpose of the Study:

  • To develop a method for concatenating independent daily GPS time transfer solutions into a continuous time series.
  • To assess the improvement in time transfer accuracy offered by a continuous series compared to daily solutions.
  • To compare GPS-based time transfer results with other techniques like two-way satellite time and frequency transfer.

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Main Methods:

  • Analysis of GPS carrier phase observations from a network of stations.
  • Independent computation of daily time transfer solutions.
  • Development and application of a concatenation method to create a continuous time series.
  • Comparison of concatenated GPS time series with results from other time transfer methods.

Main Results:

  • Daily GPS time transfer solutions exhibited jumps up to 1 nanosecond at day boundaries.
  • A continuous time series spanning over four months was successfully generated.
  • The continuous time series provided a more accurate representation of continuously operating clocks.
  • Comparisons indicated that the concatenated GPS results align well with other advanced time transfer techniques.

Conclusions:

  • Concatenating daily GPS time transfer solutions effectively overcomes the limitations of daily analysis schemes.
  • The developed method yields a continuous and more representative time series for precise timekeeping.
  • This improved time transfer methodology enhances the reliability and accuracy of time synchronization using GPS data.