the equipment will be relocated to another location and the receiver detects this (applies
to most Trimble receivers)
the Receiver Dynamics is set to Resurvey after every reboot (this feature is available only
with u-blox receivers and Trimble RES-SMT-GG receivers; it can be turned off, see "Set-
ting GNSS Receiver Dynamics" on the next page.)
you manually delete the GNSS position, see "Deleting the GNSS Receiver Position" on
page197.
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 page198
and "Determining Your Position" on page200.)
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 complete a sur-
vey. Note also that Single Satellite Mode can only be used if the SecureSync unit remains sta-
tionary 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 satellites.
The Mobile Mode should only be selected if your SecureSync unit will NOT remain stationary at
all times, i.e. instead of being operated in a building, it is installed in a mobile platform (such
as a vehicle, ship, plane, etc.).
Note: With SecureSync's GNSS receiver configured in Mobile Mode, the spe-
cified accuracies of SecureSync will be degraded to less than three times that of
Standard Mode. Standard Mode accuracy of the receiver is less than 50ns to
GPS/UTC (1sigma), hence Mobile Mode is less accurate than 150ns to
GPS/UTC time (1sigma).
3.3 Managing References
CHAPTER 3 • SecureSync User Reference Guide Rev. 26
191
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