On the effects of the ionospheric disturbances on precise point positioning at equatorial latitudes |
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| Authors: | B Moreno S Radicella M C de Lacy M Herraiz G Rodriguez-Caderot |
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| Institution: | (1) Department Section of Astronomy and Geodesy, Faculty of Mathematics, University Complutense of Madrid, Pza. Ciencias, 3, 28040 Madrid, Spain;(2) Aeronomy and Radiopropagation Laboratory, The Abdus Salam International Centre for Theoretical Physics, Strada Costiera, 11, 34014 Trieste, Italy;(3) Department of Cartographic Engineering, Geodesy and Photogrammetry, University of Jaen, Paraje Las Lagunillas s/n 23008, Jaen, Spain;(4) Department of Geophysics and Meteorology, Faculty of Physics, University Complutense of Madrid, Pza. Ciencias, 3, 28040 Madrid, Spain |
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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. |
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