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Spirent KB Article
Doc ID: FAQ11910
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Positioning Application: How do I transition from one User defined data (UDD) dataset to another?
The CUTOVER_ RAMP_PERIOD_i is used to define the time when PosApp starts to transition the use of one data set to the next.
The cutover ramp is used to ensure a smoother transiton from one dataset to the next.
The transition time is
related to the period of time that the dataset is in use.
CUTOVER_ RAMP_PERIOD_i (where 'i' can be an integer to set the period between 0 and 7200 seconds)
If '0' is used then this is equal to one simulation step equivalent to the iteration rate as set in menu [Options-->General Options].
If a value >7200 is used then a maximum of 7200 seconds will be effective.
An upper limit of 7200s (2 hours) is used as it corresponds to the standard period for a dataset before it is updated.
If the period is not specified in the first line then a default of 60 seconds is used for that dataset.
After the first line containing the CUTOVER_RAMP_PERIOD_i the second line which is enclosed by **** at each end contains the week number, GPS time and the SV number which the data set applies to.
The time is the number of seconds into the scenario run.
If UDD is selected then
SVID's contained within the datasets will be simulated.
For further details on the format of the UDD file please refer to the SimGEN user manual,
Product : SimGEN,PosApp