Ground GNSS Ionosphere Sounding - GNSS Remote Sensing: Theory, Methods and Applications - page 69

Fig. 4.2 Flowchart of GNSS DCB calculations

The M_DCB software package can estimate the DCB for a single station or for
multiple stations. For a single station, usually not all the GPS satellites are available
in one GPS receiver view. It is not convenient to use the constraint condition
mentioned in Sect. 2.2 for such a case. Here, IONEX files are used to confirm
our estimate using the same constraint conditions. The DCBs of satellites without
observations are set as known parameters.
IGS stations that were chosen to test the M_DCB estimates are show in Fig. 4.3 .
RINEX files ( http://sopac.ucsd.edu/cgi-bin/dbDataBySite.cgi or ftp://cddis.gsfc.
nasa.gov/gps/data/ ) , SP3 files ( ftp://igscb.jpl.nasa.gov/igscb/ ) and IONEX files
( ftp://cddis.nasa.gov/pub/gps/products/ionex/ ) are used in our experiment. For some
users, they may have only one GPS station or a multi-station network. The M_DCB