The difference between RTK and RTD, one is carrier phase difference, the other is code difference, and RTK has higher positioning accuracy.
RTD (Real Time Differential) and RTK (Real Time Kinematic) are both differential GPS, or DGPS, and they are both real-time, dynamic, and relative positioning.
What RTD calculates is the pseudorange. According to the known coordinates of the base station and the coordinates of each satellite, the true distance from each satellite to the base station at every moment is calculated. Then compare with the measured pseudorange to get the pseudorange correction number and transmit it to the user receiver, which belongs to the code (C/A code, P code) differential technology.
What RTK calculates is the observed value of the carrier phase of the two stations, that is, the carrier phase collected by the reference station is sent to the user receiver, and the coordinate is calculated by the difference. Belongs to carrier (L1, L2, L5) phase difference technology.
In real-time dynamic measurement, differential technology was first introduced in code phase measurement, so real-time dynamic code phase differential measurement is called conventional differential GPS measurement technology. That is, general DGPS/differential positioning.
Because RTD uses pseudo-range measurement, the accuracy is only sub-meter low, and it is usually used in non-high-precision positioning fields such as car navigation.
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