A Long-Term Comparison Between GPS Carrier-Phase and Two-Way Satellite Time Transfer

Abstract

We have conducted GPS carrier-phase time-transfer experiments between the Master Clock at USNO in Washington, DG and the Alternate Master Clock at Schriever Air Force Base near Colorado Springs, Colorado. These clocks arc also monitored on an hourly basis with two way satellite time-transfer (TWSTT) measurements. We compare the performance of the GPS carrier-phase and TWSTT systems over a 167-day period. Apart from an overall constant time offset (due to unknown delays in the GPS hardware at both ends), we find that the systems agree within +/- 1 ns, with a drift of 1.9 +/- 0.1 ps/d. For averaging times of a day, the carrier-phase and TWSTT systems have a frequency uncertainty of 2.5 and 5.5 parts in 10(15), respectively.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1998
Accession Number
ADA507744

Entities

People

  • Edward D. Powers
  • Judah Levine
  • Kristine Larson
  • Lisa Nelson
  • Tom Parker

Organizations

  • United States Naval Observatory

Tags

Communities of Interest

  • Space

DTIC Thesaurus Topics

  • Accuracy
  • Agreements
  • Air Force
  • Air Force Facilities
  • Air Temperature
  • Artificial Satellites
  • Atomic Beam Masers
  • Clocks
  • Colorado
  • Data Analysis
  • Frequency
  • Jet Propulsion
  • Kalman Filters
  • Measurement
  • Observatories
  • Phase Measurement
  • Time Intervals

Readers

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

Technology Areas

  • Space