The influence of geomagnetic storms on the estimation of GPS instrumental biases
An algorithm has been developed to derive the ionospheric total electron content (TEC) and to estimate the resulting instrumental biases in Global Positioning System (GPS) data from measurements made with a single receiver. The algorithm assumes that the TEC is identical at any point within a mes...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2009-04-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/27/1613/2009/angeo-27-1613-2009.pdf |
| Summary: | An algorithm has been developed to derive the ionospheric total electron
content (TEC) and to estimate the resulting instrumental biases in Global
Positioning System (GPS) data from measurements made with a single receiver.
The algorithm assumes that the TEC is identical at any point within a mesh
and that the GPS instrumental biases do not vary within a day. We present
some results obtained using the algorithm and a study of the characteristics
of the instrumental biases during active geomagnetic periods. The deviations
of the TEC during an ionospheric storm (induced by a geomagnetic storm),
compared to the quiet ionosphere, typically result in severe fluctuations in
the derived GPS instrumental biases. Based on the analysis of three
ionospheric storm events, we conclude that different kinds of ionospheric
storms have differing influences on the measured biases of GPS satellites
and receivers. We find that the duration of severe ionospheric storms is the
critical factor that adversely impacts the estimation of GPS instrumental
biases. Large deviations in the TEC can produce inaccuracies in the
estimation of GPS instrumental biases for the satellites that pass over the
receiver during that period. We also present a semi quantitative analysis of
the duration of the influence of the storm. |
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| ISSN: | 0992-7689 1432-0576 |