To get deeper into details, RTK uses carrier measurements in order to get centimetric. GPS signal wavelength is about 20 centimeters, so if you are able to measure the phase of this signal, that you know satellite’s phase center and that you calculate the integer number of periods between the satellite and you, this is where you get to centimetric precision. We call ambiguity the previous integer number of periods. If the algorithm finds an integer solution, then the solution is called a “fix“. This is when when maximum accuracy is reached. Otherwise, if the solution is a float, the solution is called “float“. This solution is less precise. We will refer as “single” for the positions neither “fix” nor “float” (happens if no correction data is received, or if signals are not good enough). Something really important about RTK is that if your antennas do not provide good enough signals, the computed position will easily be erroneous!