GNSS receiver must continue to track at least four satellites, otherwise the GNSS survey
will not complete.
Upon completion of the GNSS survey the GNSS receiver will lock-in the calculated GNSS
position and will enter Standard Mode. Once in Standard Mode, the GNSS survey will
only be performed again if:
the unit is halted or rebooted (see "Performing a GNSS Receiver Survey" on
page214).
the equipment will be relocated to another location and the receiver detects this
(applies to most Trimble receivers)
you manually delete the GNSS position, see "Deleting the GNSS Receiver Position"
on page217.
In the event that SecureSync cannot complete a GNSS survey within 24hours (e.g., the
survey progress does not go beyond 99%), see "Single Satellite GNSS Receiver Mode"
below.
Single Satellite GNSS Receiver Mode
The Single Satellite Mode is designed for use cases in which it is not possible for the
GNSS receiver to track at least four GNSS satellites for at least 33minutes continuously
in a 12-hour time window so as to complete the GNSS survey, i.e. obtain a 3-D fix. In such
cases, SecureSync cannot operate in Standard Mode. This occurs frequently in areas with
limited view of the sky (e.g., "urban canyons").
In Single Satellite Mode, the GNSS receiver will be considered a valid input reference as
long as:
a.
the receiver was able to complete a survey during a time window with good satellite
reception, OR you have manually entered a valid position for your antenna location
(instructions can be found under "Manually Setting the GNSS Position" on
page219 and "Determining Your Position" on page220.)
b.
the GNSS receiver continues to track at least one qualified satellite.
Note that SecureSync is designed to provide the most accurate time in Standard Mode,
hence the Single Satellite Mode should only be used if the GNSS receiver could not com-
plete a survey. Note also that Single Satellite Mode can only be used if the SecureSync unit
remains stationary at all times.
Mobile GNSS Receiver Mode
In Mobile Mode no surveys will be carried out since the position status is updated in near
real-time. SecureSync will go into synchronization shortly after beginning to track satel-
lites.
3.3 Managing References
CHAPTER 3 • SecureSync 2400 User Manual Rev. 2
211
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