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| Titel |
Accuracy analysis of the GPS instrumental bias estimated from observations in middle and low latitudes |
| VerfasserIn |
D. H. Zhang, W. Zhang, Q. Li, L. Q. Shi, Y. Q. Hao, Z. Xiao |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 28, no. 8 ; Nr. 28, no. 8 (2010-08-25), S.1571-1580 |
| Datensatznummer |
250016872
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| Publikation (Nr.) |
 copernicus.org/angeo-28-1571-2010.pdf |
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| Zusammenfassung |
| With one bias estimation method, the latitude-related error distribution of
instrumental biases estimated from the GPS observations in Chinese middle and
low latitude region in 2004 is analyzed statistically. It is found that the
error of GPS instrumental biases estimated under the assumption of a quiet
ionosphere has an increasing tendency with the latitude decreasing. Besides
the asymmetrical distribution of the plasmaspheric electron content, the
obvious spatial gradient of the ionospheric total electron content (TEC)
along the meridional line that related to the Equatorial Ionospheric Anomaly
(EIA) is also considered to be responsible for this error increasing. The RMS
of satellite instrumental biases estimated from mid-latitude GPS observations
in 2004 is around 1 TECU (1 TECU = 1016/m2), and the RMS of the
receiver's is around 2 TECU. Nevertheless, the RMS of satellite instrumental
biases estimated from GPS observations near the EIA region is around 2 TECU,
and the RMS of the receiver's is around 3–4 TECU. The results demonstrate
that the accuracy of the instrumental bias estimated using ionospheric
condition is related to the receiver's latitude with which ionosphere behaves
a little differently. For the study of ionospheric morphology using the TEC
derived from GPS data, in particular for the study of the weak ionospheric
disturbance during some special geo-related natural hazards, such as the
earthquake and severe meteorological disasters, the difference in the TEC
accuracy over different latitude regions should be paid much attention. |
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