Ionospheric Time-Delay Algorithm for Single-Frequency GPS Users

Abstract

The goal in designing an ionospheric time-delay correction algorithm for the single-frequency global positioning system user was to include the main features of the complex behavior of the ionosphere, yet require a minimum of coefficients and user computational time, while still yielding an rms correction of at least 50 percent. The algorithm designed for this purpose, and implemented in the GPS satellites, requires only eight coefficients sent as part of the satellite message, contains numerous approximations designed to reduce user computational requirements, yet preserves the essential elements required to obtain group delay values along multiple satellite viewing directions.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1987
Accession Number
ADA229968

Entities

People

  • John A. Klobuchar

Organizations

  • Air Force Systems Command

Tags

DTIC Thesaurus Topics

  • Algorithms
  • Artificial Satellites
  • Coefficients
  • Contours
  • Elevation
  • Frequency
  • Global Positioning Systems
  • Grids
  • High Latitudes
  • Ionosphere
  • Latitude
  • Longitude
  • Low Elevation
  • Observers
  • Polar Cap
  • Regions
  • Solar Activity

Fields of Study

  • Physics

Readers

  • Distributed Systems and Data Platform Development
  • Positioning, Navigation, and Timing (PNT) Technology.

Technology Areas

  • Space