Connectivity concepts 5 Connectivity
f. Make a pass in the other direction on the same A/B line and drop a third flag. Compare the
distance.
When not to use xFill technology
xFill technology is not recommended for:
l Land leveling and water management applications where a high degree of vertical accuracy is
required.
l Any operation where you need accuracy better than 1” (2.4cm).
l When the base station has not been properly surveyed, or has been surveyed only with the
Auto Base functionality and no tests have been performed to assess the risk of using xFill
technology with that base station.
VRS
VRS™, an integrated system available with a subscription, is complementary to RTK and provides
RTK corrections over a large geographic area, where robust cellular data coverage is available.
Network processing ensures high accuracy throughout the whole coverage area.
VRS consists of:
l GPS/GNSS reference stations spread out over a large area, typically 30-45 miles (50-70 km)
apart.
l A central server that uses Trimble proprietary software to create a correction model for the
region covered by the network. GPS rovers communicate using a cell modem with the VRS
server and receive RTK type corrections. The data from the reference stations is used to model
errors throughout your region. The model is used to:
l
l Create a network of virtual reference stations near your current location.
l Provide a localized set of standard format correction messages for your roving receiver.
Since the error models are updated every second, all rovers receive an optimal correction
model after connecting on to the network. This ensures a high quality correction, and
accuracy.
Network solution
All reference stations used in a VRS system can be interpreted as a network of continuously
operated reference stations. The difference between VRS and CORS is that VRS provides a network
solution. The position accuracy is maintained even if you move away from the single base but are
still within the network.
Due to the longer range, fewer base stations can cover a greater region. Additionally, VRS networks
may offer better signal coverage in rough terrain if the local cellular network is robust and provides
good data coverage.
Version 1.075, Revision C TMX-2050 Display User Guide 137
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