What is the method called that applies corrections in real time using a base station and rover?

The method that applies corrections in real time using a base station and rover is known as Real Time Kinematic (RTK) positioning. RTK is a satellite navigation technique that utilizes the signals from a network of satellites to provide accurate location data through the use of a fixed base station and a mobile rover. The base station is positioned at a known location, and it calculates the errors in the satellite signals due to atmospheric conditions, multipath effects, and other factors. These errors are then transmitted to the rover in real time, allowing it to apply the corrections and achieve highly precise positioning, often to within centimeters.

This method is particularly valuable in applications that require high accuracy, such as construction, agriculture, and surveying. The instantaneous corrections help ensure that the rover's position is consistently accurate, thus enhancing the efficiency and reliability of various projects. In contrast, the other methods mentioned do not provide the same level of real-time accuracy or depend on different principles of operation.