Use of Liberia Omega Transmissions for Frequency Calibration in Egypt

Abstract

The National Institute for Standards (NIS), is maintaining the Egyptian National Standards. Frequency comparisons with different transmissions has been going on for several years. In this paper, the measuring method used for frequency comparison by means of Omega transmission system between Liberia (12 kHz) and the NIS Is described. The results of continuous phase comparison of the transmission from Monrovia, Liberia and the HP Cesium frequency standard maintained at NIS, a distance of 6100 km during a 10 month period (Jan-Oct, 1906) are summarized. Measurements are made on the phase records at 24 hours intervals at times when the propagation path is completely sunlit and phase fluctuations are minimal. A statistical analysis of the propagational phase variations for a 65 day sample is included. A precision of 1.6 pp 10(13) is achieved in that period.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1986
Accession Number
ADA494166

Entities

People

  • Safaa Samuel

Tags

DTIC Thesaurus Topics

  • Abstracts
  • Accuracy
  • Artificial Satellites
  • Clocks
  • Department Of Defense
  • Frequency
  • Frequency Standards
  • Global Positioning Systems
  • Information Operations
  • Measurement
  • Military Operations
  • Navigation
  • Procurement
  • Radio Navigation Systems
  • Standards
  • Three Dimensional
  • Time Intervals

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • International Relations and Conflict Resolution
  • Positioning, Navigation, and Timing (PNT) Technology.