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3.5.6 Leap Second
Configuration of leap seconds include two parameters: initial GPS-to-UTC offset (due to
accumulated leap second events) and future leap second event.
To set a leap second event, navigate to Select > [Select Scenario] > Configure [selec-
ted scenario]: View 2/3 > LS: .
Figure 3-7:
Leap second configuration
The leap second event field can be set to -1, 0 or 1, and indicates a future change in GPS-
to-UTC offset value.
If the leap second event (LS field) is set to a value other than zero
The following values will be used:
Δ
t
LSF
=
Δ
t
LS
+ value given in the leap second field
WN
LSF
= The GPS week number (eight bit representation) of the week that includes the
30th of June, or 31st of December, which-ever comes first with respect to the scenario
start time.
DN = Day number of the date described above.
If the leap second event (LS field) is set to zero
The GSG will attempt to use leap second event information from navigation data.
When default navigation data is used, OR, the RINEX files attached to the scenario don't
contain indication about a future leap second event, then the following values will be used:
Δ
t
LSF
=
Δ
t
LS
WN
LSF
= WN
LS
– 1
DN = 1
If the attached RINEX files do contain indication of future leap second event, then WN
LSF
and DN are set from the RINEX file, and
Δ
t
LSF
=
Δ
t
LS
Initial GPS-to-UTC offset (
Δ
t
LS
) can be initialized automatically by the scenario start time
(using history information about actual leap second events), or by navigation data files.
3.5 "Select" Menu
User Manual GSG-5/6 Series Rev. 27 53