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Time transfer using multi-channel GPS receivers.

J Levine1

  • 1Time and Frequency Division, National Institute of Standards and Technology, Boulder, CO 80303, USA. jlevine@boulder.nist.gov

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|February 2, 2008
PubMed
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This study explores time transfer experiments using a Global Positioning System (GPS) receiver. Results suggest re-evaluating current time coordination methods in favor of a more flexible, multi-channel receiver approach.

Area of Science:

  • Metrology and Timekeeping
  • Satellite Navigation Systems
  • Geodesy and Geophysics

Background:

  • Accurate time transfer is crucial for national and international scientific and technological coordination.
  • Current time transfer methods rely on specific averaging techniques and receiver capabilities.
  • Global Positioning System (GPS) receivers offer a platform for precise time synchronization.

Purpose of the Study:

  • To evaluate time transfer experiments using a commercial GPS receiver and a standard PC.
  • To assess the performance of a multi-channel GPS receiver for time synchronization.
  • To propose an alternative time transfer approach for improved flexibility and ease of operation.

Main Methods:

  • Utilized a commercial GPS engine integrated with a standard PC to construct a time transfer receiver.

Related Experiment Videos

  • Measured time differences between a local clock and a 1 pulse per second (pps) signal synchronized to GPS time.
  • Analyzed data from up to 8 satellites, comparing individual satellite time estimates with composite GPS time signals.

    • Main Results:

    • The GPS receiver successfully measured time differences and estimated GPS time using multiple satellites.
    • Data allowed for the construction of standard 13-minute tracks and alternative averaging methods.
    • Comparison with standard receivers using common-view analysis indicated potential for improvement in current methods.

    Conclusions:

    • Current methods for national and international time and frequency coordination may require re-examination.
    • A multi-channel receiver approach offers a more flexible, simpler, and easier-to-operate alternative.
    • This approach has the potential to enhance the efficiency and accuracy of global time synchronization.