RT Journal Article
T1 On the effects of the ionospheric disturbances on precise point positioning at equatorial latitudes
A1 Moreno, B.
A1 Radicella, S.
A1 Lacy de, M.C.
A1 Herraiz, M.
A1 Rodríguez Caderot, Gracia
AB 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.
PB Springer-Verlag
SN 1080-5370
YR 2011
FD 2011
LK https://hdl.handle.net/20.500.14352/42490
UL https://hdl.handle.net/20.500.14352/42490
LA eng
NO GNSS
NO Universidad Complutense Comunidad de Madrid
DS Docta Complutense
RD 9 abr 2025