12 Chapter 2 Geode Features
Geode GNS3 Real-Time Sub-Meter GPS Receiver
communications. Just like GNSS satellites, RTK radio signals
must be sent and received via direct line-of-sight. This limits
the area around which a base station can be useful. NTRIP
changes this by allowing the base to send its positioning
and corrections data via the internet, widening the range of
application for each base station.
NTRIP has also made it possible to create networks of
localized base stations that increase both availability and
precision of RTK corrections. Since distance from a base
station strongly affects positioning precision and accuracy,
NTRIP-enabled RTK networks are able to calculate the
user’s closest base station or even use algorithms and
modeling to create a virtual base station very close to the
user’s receiver. These are free or paid services that users can
subscribe to and use as long as they have a data signal from
a cell tower.
The Geode accesses the precision available from NTRIP-
enabled RTK services via the cellular data or internet
capabilities of the device it is connected to. It uses this data
to achieve an RTK Float solution (10–30 cm).
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