Lacy de, María ClaraSanso, FernandoGil, A. J.Rodríguez Caderot, Gracia2023-06-202023-06-202005Coco D.S., Coker C., Dahlke S.R. and Clynch J.R., 1991.Variability of GPS satellite differential group delay biases. IEEE Trans. Aerosp. Electron. Syst., 7, 931−938. Fortes L.P., Cannon M.E., Lachapelle G. and Skone S., 2003.Optimizing a network-based RTK method for OTF positioning. GPS Solutions, 7, 61−73. Gil A.J., Rodríguez-Caderot G., de Lacy M.C., Ruiz A., Sanz de Galdeano C. and Alfaro P., 2002. Establishment of a non permanenet GPS Network to Monitor the Deformation in Granada Basin (Betic Cordillera, Southern Spain). Stud.Geophys. Geod., 46, 395−410. Goad C.C., 1985. Precise relative position determination using Global Positioning System carrier phase measurements in undifference mode. Proceedings of the First Symposium on Precise Positioning with the Global Positioning System, Positioning with GPS-1985, U.S. Department of Commerce,NOOA, USA, 347−356. Leick A., 1995. GPS Satellite Surveying. John Wiley & Sons, Hoboken, New Jersey, USA. Odijk D., 2002. Fast Precise GPS Positioning in the Presence of Ionospheric Delays. NCG Series, 52, Netherlands Geodetic Commission, Delft, The Netherlands. Sardon E. and Zarraoa N., 1997. Estimation of total electron content using GPS data: How stable are the differential satellite and receiver instrumental biases? Radio Sci., 32, 1899−1910. Sardon E., Rius A. and Zarraoa N., 1994. Estimation of the transmitter and receiver differential biases and the ionospheric total electron content from Global Positioning System observations. Radio Sci., 29, 577−586. Schaer S., 1999. Mapping and Prediction the Earth’s Ionosphere Using the Global Positioning System. Geodaetisch-geophysikalische Arbeiten der Schweiz, 59, Swiss Geodetic Commission, Swiiss Academy of Sciences, Bern, Switzerland. Teunissen P.J.G. and Kleusberg A., 1998. GPS for Geodesy, 2nd Edition. Springer-Verlag, Heidelberg, Germany. Trimble, 1999. GPSurvey, version 2.35a. Trimble Navigation Ltd. van der Marel H., 1998. Virtual GPS Reference Station in the Netherlands. ION GPS-98 Proceedings of the 11th International Technical Meeting of the Satellite Division of the Institute of Navigation, Institute of Navigation, Fairfax, VA, USA, 49−58.0039-316910.1007/s11200-005-1626-4https://hdl.handle.net/20.500.14352/50300To estimate ionospheric delays from the Global Positioning System (GPS) measurements, satellite and receiver equipment biases have to be modeled. This paper presents a procedure based on the least squares (LS) approach, which implicitly takes into account these equipment biases in the estimation of the ionospheric effect. The second part of this work deals with the interpolation of the ionospheric correction from a permanent GPS network to a single frequency GPS user. The results obtained show that for 10-cm position accuracy the ionospheric delay can be successfully interpolated when the GPS user is within 40 km of the GPS permanent network.engjournal articlehttp://www.springerlink.com/content/6pxfmg1xhpbyjnt1/fulltext.pdfhttp://www.springerlink.comrestricted access528GPSIonospheric delayPseudorange electronic biasInterpolationGeodesia2504 Geodesia