Glonass/GPS Time Transfer and the Problem of the Determination of Receiver Delays

Abstract

GPS and recently also Glonass receivers are widely used for navigation. When these receivers are used for time and frequency transfer, then all the internal delays and their associated stability become very important. For accurate navigation they are in 'common mode' and only need to be constant during an integration period of less than about one minute. This nanosecond level problem is sometimes not understood by manufacturers and users of those GPS and Glonass timing receivers that were converted from navigation receivers. In the paper this problem is addressed and also the specific Glonass problem caused the Frequency Division Multiplexing (FDM) wed instead of Code Division Multiplexing (CDM) used in GPS. Some delay measurement results are presented. The calibration and characterization of these delays is important for the international atomic time scale.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1997
Accession Number
ADA511025

Entities

People

  • Gerrit De Jong
  • Wlodzimir Lewandowski

Tags

DTIC Thesaurus Topics

  • Accuracy
  • Acoustic Waves
  • Air Pressure
  • Amplifiers
  • Artificial Satellites
  • Bandwidth
  • Cables
  • Calibration
  • Clocks
  • Code Division Multiplexing
  • Electronics
  • Frequency
  • Global Positioning Systems
  • Measurement
  • Navigation
  • Surface Acoustic Waves
  • Time Intervals

Readers

  • Database Systems and Applications
  • Inertial Navigation Systems.
  • Radio communications and signal processing.

Technology Areas

  • Space