Investigation of Instabilities in Two-Way Time Transfer

Abstract

The U.S. Naval Observatory (USNO) and the National Institute of Standards and Technology (NIST) have begun an investigation of the instabilities in Two-Way Satellite Time and Frequency Transfer (TWSTFT). Initial results of these tests show that the time deviation (TDEV) is typically at or below 100 ps for averaging times ranging from 10 to 104 seconds. Beyond 104 seconds we see the presence of a diurnal instability that peaks at about 400 ps. The magnitude of this diurnal appears to be dependent on the earth station equipment being used and is most likely related to environmental factors. A comparison of two-way with GPS common view and GPS carrier phase is also made along with a comparative stability analysis. This program is partially supported by the Interagency GPS Executive Board (IGEB).

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 2002
Accession Number
ADA485021

Entities

People

  • ;d. Matsakis
  • A. Mckinley
  • J. Rohde
  • Luke Nelson
  • T. E. Parker
  • V. S. Zhang

Organizations

  • National Institute of Standards and Technology

Tags

Communities of Interest

  • Materials and Manufacturing Processes
  • Space

DTIC Thesaurus Topics

  • Clocks
  • Commercial Communications
  • Controlled Environment
  • Diurnal Variations
  • Electronics
  • Environment
  • Frequency
  • Information Operations
  • Instability
  • Intervals
  • Low Temperature
  • Measurement
  • Noise
  • Standards
  • Temperature Coefficients
  • Temperature Control
  • Time Intervals

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Positioning, Navigation, and Timing (PNT) Technology.
  • Systems Analysis and Design

Technology Areas

  • Space