Abstract: Nowadays, the rapid development of sensor fusion techniques in GNSS, and IMU is offering a great opportunity to high-precision RTK positioning. The conventional tilt compensation solutions mostly use magnetmeter measurements and INS, which are sensitive to magnetic disturbances and need on-site calibrations. Moreover, the tilt compensation range is often limited to 15°. To avoid the disadvantages mentioned above, the tilt compensation solution of Leica GS18 uses IMU measurements from industrial-grade MEMS. The positioning accuracies of the Leica GS18 at large tilt angles and in difficult environments are tested by the experiments in this paper. The result indicates that the centimeter-level precision is still achievable even in hidden environments, the tilt compensation is reasonably acquired by the Leica GS18.

Key words: GNSS, RTK, IMU, Leica GS18