Trimble TMX-2050 - Base station survey; Base station survey with AutoBase

Connectivity concepts 5 Connectivity
xFill Elapsed Time Survey Accuracy <20cm Survey Accuracy <2m Survey Accuracy <5m
0 to 5 min 0 to 5 cm 0 to 15 cm 0 to 25 cm
5 to 15 min 2 cm to 12 cm 10 cm to 0.3 m 15cm to 0.5 m
15 to 20 min 9 cm to 15 cm 15 cm to 0.4 m 0.3m to 0.8 m
If you discover that the surveyed location of your base station is not accurate, your options are:
l Turn off xFill (recommended by Trimble).
l Resurvey your base station. However, this will cause the movement of any stored AB lines that
are reloaded/reused which is very undesirable to many RTK customers.
Base station survey
At initial base station installation, Trimble recommends surveying base stations by taking a 24-hour
log and processing the data to receive position on your local datum. The accuracy of this position is
stated in the report. Over time, primarily due to normal geological events, the base station position
may change up to 7cm per year. Please refer to Trimble Support Note on this topic for further
information.
When you select the datum used to survey your base station during the xFill technology setup, the
receiver will automatically convert your position in the datum you select to the equivalent position
in ITRF2008.
If your base station was properly surveyed within the last five years using one of the following
coordinate systems, the xFill technology accuracy error will typically be less than 15cm over 20
minutes.
l WGS84/ITRF2008
l NAD83
l ETRS89
l GDA94
When working within an area with several RTK base stations, each base station should have a
unique Base ID. When moving in range of another base station, go to the GPS setup on the display
and enter the Base ID. This enables the receiver to recognize the new base station.
Base station survey with AutoBase™
If the Trimble Auto Base feature was used to survey the base, the accuracy can be >5m, which
decreases the xFill technology accuracy. The datum used for this feature is WGS84. Trimble
recommends testing xFill prior to using it in an application where the base station has only been
surveyed with Auto Base.
Version 1.075, Revision C TMX-2050 Display User Guide 135