DBPapers

USING GPS FOR DETERMINATION OF THE IONOSPHERE

AUTHOR/S: TODOROVA, S., HOBIGER, T., WEBER, R., SCHUH, H.
Sunday 1 August 2010 by Libadmin2005

5th International Scientific Conference - SGEM2005, www.sgem.org, SGEM2005 Conference Proceedings/ ISBN: 954-918181-2, June 13-17, 2005, 605- 614pp

ABSTRACT

The ionosphere is the upper part of the Earth atmosphere, starting at an altitude of
about 50 km. It consists of free electrons and ions, mainly generated through solar radiation.
GPS observations are delayed within the ionosphere, since it is a dispersive medium for
electromagnetic waves. The range error caused by the ionosphere at the GPS operation
frequency L1 can reach a few tens of meters. This effect is as a first approximation
proportional to the so-called Slant Total Electron Content (STEC) along the ray path and is
compensated by measuring at two distinct frequencies. The linear combinations of the
pseudoranges do not only allow to remove a great portion of the ionospheric bias but also
make it possible to extract information about the parameters of the ionosphere in terms of
STEC values. The method of determining the ionosphere by using GPS will be discussed as
well as various applications of GPS-derived global and local ionosphere models in geodesy
and other sciences.