RINEX_HO: second- and third-order ionospheric corrections for RINEX observation files
-- by H. A. Marques, J. F. G. Monico and M. Aquino
The technical paper which describes this code is published in
GPS Solutions, Volume 15, Number 3, July 2011, pages 305-314, DOI: 10.1007/s10291-011-0220-1,
"RINEX_HO: second- and third-order ionospheric corrections for RINEX observation files"
by H. A. Marques, J. F. G. Monico and M. Aquino
H. A. Marques,
Programa de Pos Graduacao em Ciencias Cartograficas,
Universidade Estadual Paulista-UNESP, Roberto Simonsen 305,
Presidente Prudente, SP 19060-080, Brazil
J. F. G. Monico,
Departamento de Cartografia, Universidade Estadual Paulista
UNESP, Roberto Simonsen 305, Presidente Prudente,
SP 19060-080, Brazil
M. Aquino,
Institute of Engineering Surveying and Space Geodesy,
University of Nottingham, University Park, Nottingham, UK
Abstract
When GNSS receivers capable of collecting dual-frequency data are available, it is
possible to eliminate the first-order ionospheric effect in the data processing
through the ionosphere-free linear combination. However, the second- and third-order
ionospheric effects still remain. The first-, second- and third-order ionospheric
effects are directly proportional to the total electron content (TEC), although
the second- and third-order effects are influenced, respectively, by the
geomagnetic field and the maximum electron density. In recent years, the
international scientific community has given more attention to these kinds of
effects and some works have shown that for high precision GNSS positioning these
effects have to be taken into consideration. We present a software tool called
RINEX_HO that was developed to correct GPS observables for second- and third-order
ionosphere effects. RINEX_HO requires as input a RINEX observation file, then
computes the second- and third-order ionospheric effects, and applies the
corrections to the original GPS observables, creating a corrected RINEX file.
The mathematical models implemented to compute these effects are presented,
as well as the transformations involving the earth's magnetic field. The use
of TEC from global ionospheric maps and TEC calculated from raw pseudorange
measurements or pseudoranges smoothed by phase is also investigated.
The C++ and Fortran code (and sample data files) are available from following *.zip file:
Windows *.zip file (RINEX_HO_GPS_SOLUTION.zip)
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