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An annual variation analysis of the ionospheric spatial gradient over a regional area for GNSS applications

Authors
Journal
Advances in Space Research
0273-1177
Publisher
Elsevier
Publication Date
Volume
54
Issue
3
Identifiers
DOI: 10.1016/j.asr.2014.03.024
Keywords
  • Ionospheric Delay
  • Ionospheric Spatial Gradient
  • Ionospheric Plate Model
Disciplines
  • Earth Science

Abstract

Abstract An ionospheric spatial gradient represents the ionosphere delay difference between different locations, and its variation over a specific area is important for implementing differential GNSS systems. An estimation method for the ionospheric spatial gradient over a small regional area is proposed. A plate map model is implemented for the direct estimation of the gradients. Nine years of GPS data were processed to figure out the annual variation of the mean gradient at the mid-geomagnetic latitude of 30°N. Gradients along the north–south direction have a mean of 0.65mm/km and follow solar-cycle variations.

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