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Related Experiment Videos

A straightforward frequency-estimation technique for GPS carrier-phase time transfer.

Christine Hackman1, Judah Levine, Thomas E Parker

  • 1JILA, University of Colorado, Boulder, CO, USA. chackman@jila.colorado.edu

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|September 13, 2006
PubMed
Summary

A new Global Positioning System (GPS) carrier-phase time transfer (GPSCPTT) method improves frequency estimation by averaging batch results, avoiding discontinuity removal. This technique offers comparable accuracy to existing methods with reduced computational needs.

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Area of Science:

  • Metrology
  • Geodesy
  • Satellite Navigation

Background:

  • Global Positioning System (GPS) carrier-phase time transfer (GPSCPTT) provides high frequency stability but suffers from discontinuities between processing batches.
  • Current methods to determine average frequency over multiday periods involve estimating and removing these discontinuities, adding complexity and uncertainty.

Purpose of the Study:

  • To introduce and validate a novel frequency estimation technique for GPSCPTT that bypasses the need for discontinuity removal.
  • To assess the computational efficiency and accuracy of the new method compared to established techniques.

Main Methods:

  • Frequencies are computed from individual GPSCPTT processing batches and then averaged to determine the multiday mean frequency.
  • The new method was validated by comparing its fractional frequency-difference results against a GPSCPTT concatenation method and two-way satellite time-and-frequency transfer (TWSTFT).

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Main Results:

  • The new GPSCPTT method yielded frequency values in agreement with TWSTFT at several parts in 10^-16.
  • Frequencies derived from the new GPSCPTT method closely matched those from the concatenation technique, with differences at 1-4 x 10^-16.

Conclusions:

  • The proposed frequency estimation technique for GPSCPTT is accurate and computationally efficient.
  • This method eliminates the uncertainty associated with discontinuity removal, enhancing the reliability of multiday frequency determination.