Watch this video to see how RTK processes and corrects GPS data for more accurate information.
More information https://inertialsense.com/how-rtk-provides-gps-centimeter-level-accuracy/

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RTK stands for real-time kinematics. A correction service is needed from an already surveyed GPS base station and this correction is applied to the rover or moving GPS system. It can then correct atmospheric distortions and any errors in the existing GPS system. This changes your data information from meter-level positioning to centimeter-level accuracy and positioning.

Because the GPS system triangulates itself based on GPS signals from moving satellites in free space, the satellite signal travels long distances in the atmosphere. These distances in the atmosphere affect the speed at which the signal arrives at the GPS receiver.

The position estimate is critical to the timing of these signals. Weather conditions and time of day are just a few factors that can affect the signal. Because the atmosphere and time of arrival on each of these signals changes, the actual position estimate will vary.

Air is also a factor in the GPS signal itself. RTK then makes a correction from a surveyed known location relatively close to the rover. This can be up to 20 kilometers. It then applies that correction to account for these atmospheric distortions and errors.

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