Chapter 3
High Accuracy Timing
Configuring the module
T-BERD/MTS/SC Timing Expansion Module User Manual
Page 32
22112315, Rev. 004
July 2017
When you configure a manual survey, you must specify 1) the minimum duration of the
survey, and 2) the survey accuracy requirement, in meters, representing the maximum
allowed standard deviation of the position data collected throughout the survey. The
survey will run until both conditions are satisfied. Each selectable survey mode is auto-
matically associated with a specific duration and survey position accuracy.
For optimal timing performance, Viavi recommends conducting surveys for at least 12
to 24 hours. Satellites complete two orbits per day; therefore, a survey of at least 12
hours will provide data from an entire constellation. Surveys conducted for a longer
period of time (up to 24 hours) will provide more data points and, as a result, yield more
accurate coordinates.
To specify survey settings
1
Select the
Timing Module
tab, then select the
Setup
soft key.
The
GNSS
setup tab appears.
2
On the left of the screen, select
Location
.
The
Location
setup tab appears.
3
Select the Survey Mode (Quick, Fast, Typical, Expanded, or Manual). Surveys
conducted for a longer period of time will provide more position measurements,
and as a result, yield more accurate coordinates.
–
In Quick mode, the survey will run for at least one minute.
–
In Fast mode, the survey will run for at least fifteen minutes with a survey
position accuracy limit of forty five meters.
–
In Typical mode, the survey will run for at least three hours with a survey posi-
tion accuracy limit of one meter.
–
In Extended mode, the survey will run for at least 24 hours with a survey posi-
tion accuracy limit of one meter.
–
In Manual mode, the survey will be conducted for the duration of time and
with the survey position accuracy limit that you specify.
4
If you selected Manual survey mode, specify the
Survey Position Accuracy
in
meters, and the
Survey Duration
in days, hours, or minutes.
The survey settings are specified; proceed to
“Surveying GNSS constellations” on
.
Fixed position settings
If the values that the TEM Module’s GNSS receiver currently has in memory for position
and altitude are correct and your instrument will remain in the same location, you can
select the saved location (to restore the coordinates) or manually enter the accuracy,
latitude, longitude, and altitude, then select the
Position Fixed
action button provided
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