Common-View and Melting-Pot GPS Time Transfer with the UT+

Abstract

I report results of GPS time transfer relized in France between the BNM-LPTF (Bureau National de Metrologie- Laboratoire Primaire du Temps et des Frequences) at the Paris Observatory (OP) and Besancon Observatory (OB) using an Oncore UT + receiver, Motorola's last evolution of precise-time-capable GPS receivers. So-called "melting pot" measurement sessions, where all visible satellites are tracked to produce one average time measurement, were conducted and are reported on. A solution to overcome the poor set of controlling commands of the early versions of the VT + to lead single-satellite common-view is presented, together with experimental data. The performance reached by the two methods is discussed against their respective constraints. Performance is evaluated by comparisons with data acquired through classical time dedicated GPS receivers (Sercel NRT2 and AO TTRS). An operational solution allowing frequency comparisons to the French national standards at the level of a few 10(-14) over a 1-day averaging time, based on UT+ melting-pot measurements, is presented.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 2000
Accession Number
ADA485691

Entities

People

  • Florian Meyer

Tags

DTIC Thesaurus Topics

  • Acquisition
  • Algorithms
  • Artificial Satellites
  • Computer Programming
  • Data Acquisition
  • Elevation
  • Frequency
  • Intervals
  • Language
  • Measurement
  • Observatories
  • Operating Systems
  • Scheduling (Production)
  • Standards
  • Time Interval Counters
  • Time Intervals
  • User Interface

Fields of Study

  • Physics

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

Technology Areas

  • Space