A First-Order, Worldwide, Ionospheric, Time-Delay Algorithm

Abstract

A first-order model algorithm designed to reduce ionospheric time- delay errors by approximately 50% rms on a world-wide basis for single frequency users of the Global Positioning System/NAVSTAR is described. The algorithm was designed for greatest accuracy during times of day when ionospheric time-delay errors are expected to be largest. The algorithm is available in several options from one which requires only a monthly mean solar-flux value to one which requires 9 daily or monthly update coefficients. Several approximations also are made in the geometry calculations to further reduce operational user computer storage and running time requirements.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1975
Accession Number
ADA018862

Entities

People

  • John A. Klobuchar

Organizations

  • Air Force Cambridge Research Laboratories

Tags

Communities of Interest

  • Space

DTIC Thesaurus Topics

  • Accuracy
  • Air Force
  • Artificial Satellites
  • Data Links
  • Electromagnetic Wave Propagation
  • Frequency
  • Geographic Regions
  • Geometry
  • Global Positioning Systems
  • High Latitudes
  • Ionospheric Models
  • L Band
  • Latitude
  • Longitude
  • Navigation
  • Regions
  • Satellite Navigation Systems

Fields of Study

  • Physics

Readers

  • Adaptive Control and Estimation with Uncertainty in Dynamic Systems.
  • Astronomy and Astrophysics.
  • Computer Science.

Technology Areas

  • Space