- Open Access
Application of ionospheric corrections in the equatorial region for L1 GPS users
Earth, Planets and Space volume 52, pages1083–1089(2000)
In the absence of the selective availability, which was turned off on May 1, 2000, the ionosphere can be the largest source of error in GPS positioning and navigation. Its effects on GPS observable cause a code delays and phase advances. The magnitude of this error is affected by the local time of the day, season, solar cycle, geographical location of the receiver and Earth’s magnetic field. As it is well known, the ionosphere is the main drawback for high accuracy positioning, when using single frequency receivers, either for point positioning or relative positioning of medium and long baselines. The ionosphere effects were investigated in the determination of point positioning and relative positioning using single frequency data. A model represented by a Fourier series type was implemented and the parameters were estimated from data collected at the active stations of RBMC (Brazilian Network for Continuous Monitoring of GPS satellites). The data input were the pseudorange observables filtered by the carrier phase. Quality control was implemented in order to analyse the adjustment and to validate the significance of the estimated parameters. Experiments were carried out in the equatorial region, using data collected from dual frequency receivers. In order to validate the model, the estimated values were compared with “ground truth”. For point and relative positioning of baselines of approximately 100 km, the values of the discrepancies indicated an error reduction better than 80% and 50% respectively, compared to the processing without the ionospheric model. These results give an indication that more research has to be done in order to provide support to the L1 GPS users in the Equatorial region.
Camargo, P. O., Modelo Regional da Ionosfera para uso em Posicionamento com Receptores de uma Freqüência, Ph.D. Thesis, Universidade Federal do Paraná, 191 pp., 1999.
Campos, M. A., L. Wanninger, and G. Seeber, Condições ionosféricas perturbadas e os sinais GPS, 3o. Congresso Internacional da Sociedade Brasileira de Geofísica, Rio de Janeiro, pp. 601–604, 1993.
Georgiadiou, Y., Modeling the ionosphere for an active control network of GPS stations, in LGR-Series — Publications of the Delft Geodetic Computing Centre, Delft University of Technology, n. 7, 1994.
Georgiadiou, Y. and A. Kleusberg, On the effects ionospheric delay on geodetic relative GPS positioning, Manuscripta Geodaetica, 13(1), 1–8, 1998.
Jin, X. X., Theory of carrier adjusted DGPS positioning approach and some experimental results, Ph.D. Thesis, Delft University of Technology, 162 pp., 1996.
Klobuchar, J. A., Ionospheric time-delay algorithm for single-frequency GPS users, IEEE Transactions on Aerospace and Electronic Systems, AES-23(3), 325–331, 1987.
Klobuchar, J. A., Ionospheric effects on GPS, GPS World, April, 48–50, 1991.
Leick, A., GPS Satellite Surveying, 560 pp., John Wiley & Sons, New York, 1995.
Monico, J. F. G., High Precision GPS Inter-continental Networks, Ph.D. Thesis, University of Nottingham, 205 pp., 1995.
Newby, S. P. and R. B. Langley, Three alternative empirical ionospheric models—are they better than GPS broadcast model?, in Proceedings of the Sixth International Geodetic Symposium on Satellite Positioning, pp. 240–244, Columbus, 1992.
NRCan, User’s Guide—GPSPACE (GPS Positioning from ACS Clocks and Ephemerides—Version 3.2), Canadian Active Control System Operations, Geodetic Survey Division, Geomatics Canada, Natural Resources Canada, 1997.
Sardon, E. and N. Zarraoa, Estimation of total electron content using GPS data: how stable are the differential satellite and receiver instrumental biases, Radio Sci., 32, 1899–1910, 1997.
Teunissen, P. J., Quality control in geodetic networks, in Optimization and Design of Geodetic Networks, pp. 526–547, Berlin, 1985.
Wanninger, L., G. Seeber, and M. A. Campos, Use of GPS in the south of Brazil under severe ionospheric conditions, in IAG Symposium III, 10 pp., Heidelberg, 1991.
Wanninger, L., G. Seeber, and M. A. Campos, Limitations of GPS in equatorial regions due to the ionosphere, VII Simpósio Brasileiro de Sensoriamento Remoto, 14 pp., Curitiba, 1993.
Wells, D., N. Beck, D. Delikaraoglou, A. Kleusberg, E. J. Krakiwsky, G. Lachapelle, R. B. Langley, M. Nakiboglu, K. P. Schwarz, J. M. Tranquilla, and P. Vanicek, Guide to GPS Positioning, Canadian GPS Associates, Fredericton, New Brunswick, Canada, 1986.
Wilson, B. D., C. H. Yinger, W. A. Feess, and C. Shank, New and improved the broadcast interfrequency biases, GPS World, September, 56–66, 1999.
Zhong, D., Robust estimation and optimal selection of polynomial parameter for the interpolation of GPS heights, Journal of Geodesy, 9(71), 552–561, 1997.
About this article
Cite this article
de Camargo, P.O., Monico, J.F.G. & Ferreira, L.D.D. Application of ionospheric corrections in the equatorial region for L1 GPS users. Earth Planet Sp 52, 1083–1089 (2000). https://doi.org/10.1186/BF03352335
- Global Position System
- Total Electron Content
- Global Position System Satellite
- Global Position System Signal
- Ionospheric Correction