Measuring the Propagation Time of Coaxial Cables Used with GPS Receivers

Abstract

Time comparisons by means of GPS are now widely used. The calibration of the receiver delay and the delay in the association coaxial cables is very important to reach accuracies better than 10 ns. This paper describes and compares two methods: one using pulses of short rise times and one using interferometry of frequencies in the vicinity of the nominal frequency used. The results of the tests are described. Uncertainties < than 1 ns were attained for a cable length of 100 m at the 75 MHz IF frequency of the NBS designed GPS receivers.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1985
Accession Number
ADA494671

Entities

People

  • Gerrit De Jong

Tags

DTIC Thesaurus Topics

  • Abstracts
  • Accuracy
  • Cables
  • Calibration
  • Coaxial Cables
  • Frequency
  • Information Operations
  • Intervals
  • Measurement
  • Metrology
  • Observatories
  • Time Intervals

Fields of Study

  • Physics

Readers

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

Technology Areas

  • Space