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Developing an IGS time scale.

Ken Senior1, Paul Koppang, Jim Ray

  • 1Naval Research Laboratory, Washington, DC 20375, USA. Ken.Senior@nrl.navy.mil

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|July 4, 2003
PubMed
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The International GPS Service (IGS) has poor day-to-day clock stability. A new filter package creates an integrated IGS frequency scale, improving stability by using a weighted ensemble of frequency standards.

Area of Science:

  • Geodesy
  • Metrology
  • Satellite Navigation Systems

Background:

  • The International GPS Service (IGS) provides satellite and receiver clock products at 5-min intervals.
  • Current IGS clock products offer few-cm accuracy for isolated receivers.
  • The IGS combined clock's time scale stability is poor due to daily linear alignment to GPS Time.

Purpose of the Study:

  • To develop and evaluate a new filter package for automated production of an integrated IGS frequency scale.
  • To improve the day-to-day stability of the IGS reference time scale.

Main Methods:

  • A new filter package was developed to automate the production of an integrated IGS frequency scale.
  • The scale is based on a dynamically weighted ensemble of frequency standards.

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  • The new scale is loosely steered to GPS Time.

    • Main Results:

    • The new filter package successfully automates the production of an integrated IGS frequency scale.
    • The new scale demonstrates improved day-to-day stability compared to the current IGS approach.
    • The dynamically weighted ensemble method effectively integrates frequency standards.

    Conclusions:

    • The developed filter package provides a more stable and reliable IGS frequency scale.
    • This advancement enhances the consistency and accuracy of GPS-derived coordinates and clock values.
    • The new scale offers a superior reference for precise positioning and timing applications.