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Spirent KB Article
Doc ID: FAQ14529
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Positioning Application: Why does the GLONASS UDD file not include all the parameters specified in the RINEX file?
PosApp V4.03 SR01 onward with the use of 'Rinex_Parser.exe' (see
for more information)
Rinex V2.10 only
is not required because PosApp auto populates the navigation message with the tk value based on the scenario start time and time into run
parameter and P1 Flag
are not required as PosApp does this automatically. Explanation and example below:-
Start a scenario at 00:00 hours (in the scenario tree) with an update interval of 30 mins (as specified in the UDD header)
will be 195 minutes (because GLONASS time is 3 hours, 180mins, ahead of UTC and an additional 15mins is needed because the tb value is reported half way through the 30 minute update interval).
The tb value will remain at 195 minutes until the next update interval.
is determined by PosApp based on the interval update rate given in the UDD file header (30mins in this example) and consecutive values of tb.
changes based on the value of the tb parameter and therefore is not required in the UDD file as PosApp calculates these
is automatically populated in the nav data because PosApp is always aware of the number of satellites for which almanac data is transmitted within the given frame
is based on the UDD header update rate and time into run. Both of which PosApp calculates
Product : SimGEN,PosApp,GLONASS