Effects of ionospheric horizontal gradients on differential GPS

Mardina Abdullah, Hal J. Strangeways, David M A Walsh

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

This paper outlines the effect of horizontal ionospheric gradients on transionospheric path propagation such as for the case of GPS signals. The total electron content (TEC) is a function of time of day, and is much influenced by solar activity and also the receiving station location. To make the model applicable for long baselines, for which the ionosphere is not generally well correlated between receiving stations, the ionospheric gradients should be taken into account. In this work the signal path is determined using a modified ray-tracing technique together with a homing-in method. Results show that horizontal gradients can have a significant effect on GPS positioning for both single station positioning and differential GPS. For differential GPS, the ionospheric delay can, however, be either increased or decreased compared with the case of no gradient, depending on the gradient direction.

Original languageEnglish
Pages (from-to)509-523
Number of pages15
JournalActa Geophysica
Volume55
Issue number4
DOIs
Publication statusPublished - Dec 2007

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ionospherics
GPS
gradients
stations
positioning
homing
ray tracing
solar activity
ionosphere
ionospheres
effect
propagation
station
electrons

Keywords

  • GPS
  • Ionosphere
  • Ionospheric gradients
  • Ray-tracing
  • TEC

ASJC Scopus subject areas

  • Geophysics

Cite this

Effects of ionospheric horizontal gradients on differential GPS. / Abdullah, Mardina; Strangeways, Hal J.; Walsh, David M A.

In: Acta Geophysica, Vol. 55, No. 4, 12.2007, p. 509-523.

Research output: Contribution to journalArticle

Abdullah, Mardina ; Strangeways, Hal J. ; Walsh, David M A. / Effects of ionospheric horizontal gradients on differential GPS. In: Acta Geophysica. 2007 ; Vol. 55, No. 4. pp. 509-523.
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