5 Connectivity Connectivity concepts
VRS base station
If using VRS, the accuracy is typically <1cm . Contact your VRS network owner to determine the
datum used for surveying and enter this datum during the xFill technology set-up. Trimble VRS
Now™ network uses the following:
l VRS Now US: NAD83
l VRS Now Europe: ETRS89
l VRS Now TEC Europe: ETRS89
l OmniSTAR® CORS Tasmania: GDA94
Base station, survey unknown
If you do not know if your base station has been surveyed or the datum used for surveying, you
should perform testing to approximate your base station errors or turn off xFill technology .
Estimating base station errors
To estimate the error in the position f the base station, options include:
l Calculate Current Position and Compare to Set Position: Collect two hours of position logs
and submit them for post-processing (using the same coordinate system as previously used).
Then enter the current set position and the newly calculated position into a GPS distance tool
calculator.
l xFill Accuracy Detection Using Cross Track Error: Set-up your antenna and receiver in an open
air environment (field or parking lot). Create an A+ line based on your parked position with RTK
fixed. Unplug the radio or unplug the DCM-300 modem if using cellular signal. xFill technology
will engage. Watch your cross track error (XTE) for a maximum of 20 minutes. Repeat several
times. Keep in mind that this static test only tests the error in one direction (N/S or E/W).
l
xFill Accuracy During Passes in a Field: To best see the drift of the xFill position over time:
Note – This procedure will only be accurate if you have already completed the Roll Calibration
for auto-steering. (See Vehicle setup, 140.)
a. Create an A/B line in your field (or use an existing line). (See AB guidance line creation (Run
screen), 251.)
b. Drive the line and once your cross track error (XTE) is very small, stop and drop a flag in the
center of your hitch.
c. Turn off RTK by changing the network ID or frequency.
d. Drive around the field for several minutes (to represent your typical outage time) and
return to the A/B line.
e. Engage on the line and then when XTE is small and you’re over you previous flag, stop and
drop another flag. Compare the distance.
136 TMX-2050 Display User Guide Version 1.075, Revision C
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