To get sub-meter accuracy RTK is needed. RTK uses advanced mathematical algorithms to calculate the precise differences in signal phase between the GPS satellites and the receiver at both the base station and the rover. By 'locking onto' the satellite carrier signal, better accuracy is possible because the carrier signal has a much higher frequency compared to the encoded C/A (Coarse/Acquisition) code.

Real Time Kinematic - Summary

Removes errors from satellites by comparing signals received at your GPS receiver with those simultaneously received at a nearby stationary antenna of known high accuracy and position (base station). The closer your GPS receiver is to the base station, the better your results will be. This distance is known as the “baseline”.

RTK calculations require the roving GPS receiver to be connected to a remote base station receiver, which is located at a known, fixed position. The base station provides phase comparison and correction data. In modern systems, this connection is typically made via a mobile phone using an IP-based network. RTK technology is very mathematical and complex – we don’t need to understand it - just the results and limitations. Centimeter/inch accuracies are possible but there are some things to be aware of.

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