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On the effects of the ionospheric disturbances on precise point positioning at equatorial latitudes

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Moreno, B. and Radicella, S. and Lacy de, M.C. and Herraiz, M. and Rodríguez Caderot, Gracia (2011) On the effects of the ionospheric disturbances on precise point positioning at equatorial latitudes. GPS Solutions, 15 (4). pp. 381-390. ISSN 1080-5370

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Abstract

In precise point positioning (PPP), the ionospheric delay is corrected in a first-order approximation from GPS dual-frequency observations, which should eliminate almost completely the ionosphere as a source of error. However, sudden plasma density variations can adversely affect the GPS signal, degrading accuracy and reliability of positioning techniques. The occurrence of plasma density irregularities is frequent at equatorial latitudes and is reflected in large total electron content (TEC) variations. We study the relation between large changes in the rate of TEC (ROT) and positioning errors in single-epoch PPP. At equatorial latitudes and during post-sunset hours, the estimated altitudes contain errors of several meters for a single-epoch position determination, and latitude and longitude estimates are also degraded. These results have been corroborated by the online CSRS-PPP (NRCan) program. Moreover, abrupt changes in the satellite geometry have been discarded as possible cause of such errors, suggesting an apparent relation between the occurrence of large ROT and degraded position estimates.


Item Type:Article
Uncontrolled Keywords:Ionospheric disturbances; Precise point positioning; Equatorial latitudes
Subjects:Sciences > Mathematics > Astronomy
ID Code:17729
Deposited On:17 Jan 2013 09:30
Last Modified:20 Jul 2018 08:58

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