The Accuracy of Two-Way Satellite Time Transfer Calibrations

Abstract

Results from successive calibrations of Two-Way Satellite Time and Frequency Transfer (TWSTFT) operational equipment at USNO and five remote stations using portable TWSTFT equipment are analyzed for internal and external errors, finding an average random error of 0.35 ns, an average type-B uncertainty of 0.15 ns, and an average total error of 0.38 ns for a single calibration measurement over time spans of up to 4.9 years. Closure discrepancies suggest that the operational apparatus is at least as good as the calibration equipment.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2005
Accession Number
ADA434295

Entities

People

  • Alan L. Smith
  • Blair C. Fonville
  • Demetrios N. Matsakis
  • Edward Powers
  • Lee A. Breakiron

Organizations

  • United States Naval Observatory

Tags

Communities of Interest

  • Space

DTIC Thesaurus Topics

  • Accuracy
  • Artificial Satellites
  • Calibration
  • Clocks
  • Equations
  • Errors
  • Frequency
  • Frequency Standards
  • International Organizations
  • Intervals
  • Ku Band
  • Measurement
  • Observatories
  • Portable Equipment
  • Standards
  • Time Interval Counters
  • Time Intervals

Fields of Study

  • Environmental science
  • Physics

Readers

  • Approximation Theory.
  • Molecular Photonics/Laser Physics
  • Positioning, Navigation, and Timing (PNT) Technology.

Technology Areas

  • Space