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GPS and Time Metrology. GPS is base for the most common used long-haul time and frequency measurement methods within the time community, it is: precise (3ns code, ca 100ps phase for frequency) , truly global , low cost , use is free of charge ,

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gps and time metrology
GPS and Time Metrology
  • GPS is base for the most common used long-haul time and frequency measurement methods within the time community, it is:
    • precise (3ns code, ca 100ps phase for frequency),
    • truly global,
    • low cost, use is free of charge,
    • reliable, robust (during peacetime) andvery well monitored,
    • well understood (code).
  • In combination with other GNSS,for example GLONASS and the future GALILEO, it offers even better robustness and performance.
gps and time metrology1
GPS and Time Metrology
  • Due to its excellent performance (code) it is primarily used to form TAI and UTC.
  • The use of carrier phase (CP) allows to exploit an unmatched accuracy for frequency measurements, but some aspects of CP are still ongoing research!
  • SP GPS time metrology research involves for example:
    • real-time frequency estimation,
    • post processing (CP and Code),
    • comparison with other accurate techniques (TWSTFT),
    • the use of CP methods on the application niveau (GPS aided clock transport, cable length measurements,...).