Trimble TMX-2050 - Understanding Connectivity Concepts

Connectivity concepts 5 Connectivity
Connectivity concepts
For more information about concepts associated with GNSS, correction services, see:
l xFill technology, 133
l GNSSand drift, 133
l VRS, 137
GNSSand drift
GNSS satellites are in continuous motion as they orbit the earth twice per day in a repeated pattern.
Satellites transmit signals that the GNSS receiver translates to determine its position.
While performing field activities, you may notice differences in:
l Where the crop row is
l Where the guidance line was established
l Where the display is indicating the guidance line is now located.
This happens because GNSS satellite constellation patterns change over time and can experience
interference.
Local and atmospheric conditions can impact signals. Temperature and humidity can delay signals.
Signals can also be reflected from surrounding objects such as trees, causing multiple copies of the
signal or a delay in the signal reaching the receiver. Data errors from the satellite can also affect
accuracy.
xFill technology
xFill™ technology uses Trimble RTX technology to "fill in" for RTK corrections when there are
temporary radio or Internet connection outages. xFill technology is a standard feature and is
compatible with the AG25 GNSS antenna. The xFill technology can function with corrections from
single-baseline RTK, VRS and CORS systems.
When there is an interruption of the RTK correction signal (either from the radio base station or
from the VRS cellular network), the xFill technology performs corrections. xFill technology uses the
last-known RTK position combined with the RTX precision satellite data to maintain a high level of
horizontal positioning accuracy for up to 20 minutes. There is a smooth transition from RTK to xFill
technology and back to RTK.
Automatic guidance systems
If an auto-steering system is engaged using RTK, the auto-steer system will stay engaged during the
20 minute xFill coverage. As soon as an RTK signal is available, the receiver will switch back to the
RTK correction service and xFill will remain on standby in the background. If the system cannot
resume an RTK Fixed status within 20 minutes the system will fall back to DGPS correction and the
auto-steer system will disengage.
Version 1.075, Revision C TMX-2050 Display User Guide 133