The digital study of the project (Digital Terrain Model) is imported with a USB stick into the computer of the 3D Panel System. The Robotic Geodetic Station (PowerTracker) follows the prism (Lock Prism) every moment. The Calculator compares the instantaneous actual position of the knife with the desired one according to the study.
The deviation of the actual from the desired position is eliminated, as the computer commands the knife to raise/lower. It also gives an order to "draw" the Knife (Sideshift). One side of the knife is controlled by the altimeter (lens Leica PowerTracker) and the other by the knife inclinometer.
The advantages of the TPS System are accuracy (+/- 1cm), speed and savings in material, fuel and personnel. In this arrangement the prism can be replaced with a GPS receiver.
The GPS Grader arrangement has the advantage of not needing position changes of the Geodetic Station.
