헬기시험을 통한 UAM 실증 항로상 실시간 SBAS, RTK 동적 성능 평가

Abstract

This study evaluates the dynamic real-time navigation performance of the Satellite-Based Augmentation System (SBAS) and Real-Time Kinematic (RTK) positioning through helicopter flight tests conducted along the K-UAM Grand Challenge 2nd phase (GC 2-1) demonstration route. In previous studies, flight tests were conducted. However, it was not possible to transmit or receive real-time RTK correction data. Consequently, the RTK performance was analyzed using post-processed raw measurements. In contrast, this study conducted thirteen helicopter flight missions along the Ara Waterway section (GC2-1 demonstration route) connecting the Geyang Vertiport and the KIAST Drone Certification Center. During these missions real-time correction data were received and applied. The flight tests covered all operational phases, including take-off, cruise, and landing. Due to aircraft safety regulations and electromagnetic interference management standards, the GNSS antenna was installed inside the aircraft cabin (beneath the canopy). Although this configuration could cause signal attenuation and multipath effects, both navigation modes (SBAS and RTK) were operated under identical conditions to ensure a reliable comparison of relative performance. The results show that the mean horizontal and vertical position errors of SBAS were approximately 1.94 m and 1.62 m, respectively, while those of RTK were about 0.07 m and 0.09 m. This study experimentally demonstrates the dynamic performance characteristics of real-time SBAS and RTK navigation in K-UAM flight environments and is expected to contribute to the establishment of Navigation System Error (NSE) and Total System Error (TSE) standards for navigation systems within UAM corridors and vertiports.