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 page181
and "Determining Your Position" on page183.)
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).
3.3.2.4 Setting GNSS Receiver Dynamics
This Receiver Dynamics setting further refines the reception characteristics for the different
receiver modes (see above). It also determines if the receiver will automatically resurvey after
SecureSync reboots.
Note: This option only applies to u-blox M8T Receivers and Trimble Res-T Receivers
(RES-SMT-GG and SAASM GPS do NOT support this.)
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CHAPTER 3 • SecureSync User Reference Guide Rev. 23
3.3 Managing References
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