SOKKIA
PowerNET! Concept
To achieve cm-level accuracy, RTK (Real Time Kinematic) is known to be the best approach. In this technique, correction messages are sent from the base station to rover receivers. Corrections received from a base station are subject to ppm errors i.e. 1 mm for every 1 km the rover goes away from the base and with longer vector distances (up to 40km) the errors can be noticeable. By networking, the correction trend can be modeled between stations and "virtual base stations" created.
Single Base GNSS vs Network RTK
In the following diagram, it can clearly be observed how PowerNET! GPS Reference Network will improve over individual base stations:
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PowerNET!
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