Real Time Kinematic (RTK) GPS is a high-precision GPS technology that can provide accuracy down to a few centimeters. It is used in a variety of applications where precise location information is required, such as surveying, mapping, and construction.
RTK GPS works by using a stationary reference station, known as a base station, to transmit correction data to a mobile receiver. The correction data is used to compensate for errors in the GPS satellite signals, allowing the mobile receiver to calculate its position with a high degree of accuracy. RTK GPS systems typically use two frequencies (L1 and L2) to provide even greater accuracy.
In order to use RTK GPS, the base station and mobile receiver must be connected, either via a radio link or through a network connection such as NTRIP (Network Transport of RTCM via Internet Protocol). Once connected, the mobile receiver can continuously calculate its position in real-time as it moves. RTK GPS is commonly used in conjunction with specialized surveying equipment such as total stations and levels.