Customer Service Center
Spirent KB Article
Doc ID: FAQ17025
Email Article Link
Positioning Application: What is User Defined Data(UDD)?
User Defined Data
GPS and/or GLONASS
UDD is an optional ASCII text file that supplements or modifies the data specified in the signal sources files
UDD can be used to produce conflicting data, for example a user could:
Enable the 'Sat Orb data file' with satellite 1 in Position "A"
Enable the 'Eph Nav data file' with satellite 1 in Position "B"
Enable the 'Alm Nav data file' with satellite 1 in Position "C"
The above configuration would mean the following:
Satellite 1 is physically located in Position "A"
Satellite 1 broadcasts Ephemeris data to suggest it is in Post ion "B"
All other satellites broadcast almanac data to suggest satellite 1 is in position "C"
Product : SimGEN,PosApp