Centimeter Level Augmentation Service (CLAS) is a technique for improving position accuracy in satellite navigation
. The CLAS technique is another method used to generate correction signals to increase the positional accuracy of GPS signals. The CLAS technique takes into account errors caused by the ionosphere and troposphere. The aim of these relatively small but extremely precise correction signals is to obtain control signals for autonomous driving. In addition, the CLAS correction signals will also be used in commercial vehicles or drones.