Application of Kohonen maps to the GPS Stochastic Tomography of the Ionosphere
- 1.5k Downloads
The adaptative classification of the rays received from a constellation of geodetic satellites (GPS) by a set of ground receivers is performed using neural networks. This strategy allows to improve the reliability of reconstructing the Ionospheric electron density from GPS data. As an example, we present the evolution of the radially integrated electron density (Total Electron Content, TEC) during the day 18th October 1995, coinciding with an important geomagnetic storm. Also the problems in the vertical reconstruction of the electron density are discussed, including the data coming from one Low Earth Orbiter GPS receiver: the GPS/MET. Finally is proposed as main conclusion a new strategy to estimate the ionospheric electron distribution, using GPS data, at different scales —the 2-D distribution (TEC) at Global scale and the 3-D distribution (Electron density) at Regional scale—.
KeywordsGlobal Position System Total Electron Content Geomagnetic Storm Global Position System Data Global Position System Receiver
Unable to display preview. Download preview PDF.
- Davies K. (1990): Ionospheric Radio. IEE ElectroMagnetic Waves Series 31, Peter Perigrinus Ltd., London.Google Scholar
- Press W.H., Flannery B.P., Teukolsky S.A., Vetterling W.T. (1986): Numerical Recipes. The Art of Scientific Computing. Cambridge Univ. Press, Cambridge.Google Scholar
- Sanz J., Juan J.M., Hernandez-Pajares M., Madrigal A.M. (1996): GPS Ionosphere imaging during the “October-18th 1995” magnetic cloud. European Geophysical Society meeting, The Hague, May 1996.Google Scholar
- Sardón E., Rius. A.. Zarraoa N. (1994): Estimation of the transmitter and receiver differential biases and the ionospheric total electron content from Global Positioning System observations. Radio Science, Vol. 29, No. 3, pages 577–586.Google Scholar
- Seeber G (1993): Satellite Geodesy. Walter de Gruyter, Berlin.Google Scholar
- Zumberge J., Neilan R., Beutler G., Gurtner W., 1994. The International GPS Service for Geodynamics-Benefits to Users. ION GPS-94, Salt Lake City, Utah.Google Scholar