Upon completion of the GNSS survey the GNSS receiver will lock-in the calculated GNSS pos
ition and will enter
Standard Mode
. Once in
Standard Mode
, the GNSS survey will only be
performed again if:
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
page 197.
In the event that NetClock cannot complete a GNSS survey within 24 hours (e.g., the survey pro
gress 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
33 minutes
continuously in a 12-hour
time window so as to complete the GNSS survey, i.e. obtain a 3-D fix. In such cases, NetClock
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 page 199
and "Determining Your Position" on page 200.)
b.
the GNSS receiver continues to track at least
one qualified satellite
.
Note that NetClock 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 survey.
Note also that Single Satellite Mode can only be used if the NetClock 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. NetClock will go into synchronization shortly after beginning to track satellites.
The
Mobile Mode
should only be selected if your NetClock 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.).
3.3 Managing Input References
CHAPTER
3
•
NetClock User Reference Guide
Rev.
16
191
Содержание NetClock 9400 Series
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