• Journal of Advanced Navigation Technology
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• v.27 no.4
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• pp.374-381
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• 2023

This study focuses on the implementation of C-band radio navigation in the 5.03 ~ 5.15 GHz terrestrial band to cooperate with GNSS navigation mainly used in existing UAMs. This is one of the navigation technologies that can fully satisfy the requirements of Title 14 of CFR-135.165. According to the FAA, the use of two or more independent navigation sources for aircraft is proposed for aircraft. This study proceeded with the link budget derivation through radio wave propagation path loss analysis, and antenna shape design for miniaturized Doppler VOR, and DME design with enhanced positional distance resolution compared to conventional aircraft. The ground navigation system which is the result of this study, consists of a VOR/DME ground station and a terminal that can be mounted on UAM. Significant performance was confirmed through the production and testing of each prototype.

• Journal of Advanced Navigation Technology
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• v.28 no.5
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• pp.582-587
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• 2024

The azimuth generator and acquirer for UAV navigation is a system that helps UAVs to precisely determine their own azimuth while they are flying, similar to the DVOR of existing civil aircraft. This system consists of a ground base station that generates an azimuth signal by the Doppler effect and a signal acquisition terminal that receives the azimuth signal and derives the azimuth of the UAV. This study focuses on the implementation of C-band radio navigation in the 5.03 ~ 5.15 GHz terrestrial band to cooperate with GNSS navigation mainly used in existing UAMs. This is one of the navigation technologies that can fully satisfy the requirements of Title 14 of CFR-135.165. According to the FAA, the use of two or more independent navigation sources for aircraft is proposed for aircraft. In this study, the design and implementation of the core technologies of the system, such as azimuth signal generation, sine/cosine signal generation required for azimuth derivation, phase detection comparator of AM/FM signals, and blending signal generator for antenna switching for the Doppler effect, were performed using FPGA. The results of azimuth derivation for 1000 samplings were confirmed to satisfy the ICAO standard of ±3° with a maximum deviation of ±1.1°.