Spectracom NetClock 9489 - Setting GNSS Receiver Dynamics

Note: With NetClock's GNSS receiver configured in Mobile Mode, the specified
accuracies of NetClock will be degraded to less than three times that of Standard
Mode. Standard Mode accuracy of the receiver is less than 50ns to GPS/UTC
(1sigma), hence Mobile Mode is less accurate than 150ns to GPS/UTC time
(1sigma).
3.3.3.4 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
NetClock 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.)
Caution: If you select a setting that does NOT resurvey, and subsequently relocate
your unit (antenna) by more than 100m, u-blox M8T and Trimble Res-T receivers
will NOT detect the new position, and hence provide an incorrect time.
For more information about the GNSS Survey, see "Deleting the GNSS Receiver Position" on
page197.
For more information on Receiver Modes , see "Selecting a GNSS Receiver Mode" on
page189.
Available GNSS Receiver Dynamics Settings
The following Receiver Dynamics settings are available:
Land (Resurvey): [default]
When used with the Mobile Receiver Mode, the receiver is adjusted for typical dynamic
land-based applications.
When used with the Standard Receiver Mode, this setting also will automatically initiate
a resurvey after NetClock reboots, in order to account for a possible relocation.
Sea: The receiver dynamics will be optimized for mobile motion patterns typical with
marine applications, resulting in greater timing accuracy, and avoiding premature loss
of synchronization.
Air: The receiver dynamics will be optimized for acceleration forces typically exper
ienced in civil aviation applications.
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CHAPTER 3 • NetClock User Reference Guide Rev. 16
3.3 Managing Input References