Positioning Accuracy by the Quasi-Zenith Satellite System in Mountainous Fields

Abstract

Positioning accuracy of Quasi-Zenith Satellite System （QZSS） was experimented by using a robot tractor in mountainous fields. The robot tractor can plow the fields while automatically driven by using a real-time kinematic global navigation satellite system （RTK-GNSS）. Two multi-frequency GNSS receivers were additionally mounted on the tractor to measure the positioning accuracy and the number of used satellites by different augmentation signals. The positioning data of tractor were collected in seven fields under three methods, which are RTK by GPS and GLONASS, CLAS （centimeter level argumentation service） by QZSS, and RTK by GPS, GLONASS, Galileo, QZSS and Beidou. The result shows that the CLAS method of the QZSS can measure the stable position of tractor.