Comparison of Atomic Frequency Standards at NIST and PTB Using Carrier-Phase GPS

Abstract

We have constructed a link between Physikalisch-Techniche Bundesanstalt (PTB) in Braunschweig, Germany and the National Institute of Standards and Technology (NIST) in Boulder, Colorado using carrier-phase Global Positioning System (GPS) receivers. The link will provide a direct measurement of the frequency difference between UTC(PTB) and UTC(NIST), and can also be used to provide a direct comparison between the primary frequency standards at the two laboratories. Based on our previous work with this method, we expect to be able to realize the frequency comparisons with an uncertainty of about 2 X 10(-15) using one day of averaging. This uncertainty is smaller than the combined uncertainties of the primary frequency standards in both laboratories, and it will therefore support a near-real-time comparison of these primary frequency standards without degrading their capabilities with the noise of the transfer system.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1999
Accession Number
ADA497323

Entities

People

  • Judah Levine
  • Juergen Becker
  • Kristine Larson
  • Lisa Nelson
  • Peter Hetzel
  • Thomas Parker

Organizations

  • National Institute of Standards and Technology

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Atomic Beam Masers
  • Clocks
  • Colorado
  • Frequency
  • Frequency Standards
  • Global Positioning Systems
  • Hydrogen
  • Intervals
  • Jet Propulsion
  • Masers
  • Phase
  • Phase Measurement
  • Standards
  • Time Intervals
  • Uncertainty
  • United States

Readers

  • Positioning, Navigation, and Timing (PNT) Technology.

Technology Areas

  • Space