Bernese GPS Software Version 5.0 - Bernese GNSS Software

22.4 General Files
(8) At “REQUESTED SNAPSHOTS”, you may define for which times TEC maps (snapshots)
should be computed and written to the IONEX file. Using “12 00 00”, “12 00 00”,
“86400”, you would get a single snapshot at 12:00:00 UT. An other setting might be:
“01 00 00”, “23 00 00”, “7200”. This would lead to 12 2-hourly snapshots, namely
at 01:00:00, 03:00:00, 05:00:00, ..., 23:00:00 UT.
(9) At “DATA GRID”, you have to define the geographical area and the spatial resolution
of the grid where TEC and rms values are probed. Note that the current setting is
suited for global TEC maps, but not for regional maps.
(10) Under “ADDITIONAL OPTIONS”, you might define (a) a “minimum TEC value” (TEC
values below this threshold are set to this value), (b) a “maximum rms value” (TEC
values with larger rms errors are considered as unavailable), and (c) a “scaling factor
for rms values” to scale (multiply) the rms errors obtained by the least-squares adjustment.
Since negative TEC is physically impossible, a threshold value of 0 TECU
would make sense at (a).
Nevertheless, we advise the interested user to study the IONEX format specifications [Schaer
et al., 1998] and to have a look at CODE’s ionosphere-related web site http://www.aiub.
unibe.ch/ionosphere.html [Schaer, 1998].
IONEX CONTROL FILE 14-MAR-02 00:00
------------------------------------------------------------------------
(REMARK: YES=1,NO=0 ; 2 EMPTY LINES AFTER EVERY INPUT GROUP)
SATELLITE SYSTEM:
----------------
********************
--> : GPS
AGENCY:
------
********************
--> :
MULTI-LINE DESCRIPTION (UP TO 30 LINES):
---------------------------------------
************************************************************
--> :
OBSERVABLES USED:
----------------
************************************************************
--> :
MULTI-LINE COMMENT (UP TO 30 LINES):
-----------------------------------
************************************************************
--> : TEC/RMS values in 0.1 TECU; 9999, if no value available
DCB COMMENT:
-----------
************************************************************
--> : DCB values in ns; zero-mean condition wrt satellite values
...
Figure 22.16: General IONEX information file IONEX.
Bernese GPS Software Version 5.0 Page 497