Network-Based Augmentation System (NBAS) Architectures Optimized to Support Urban Air Mobility (UAM)

Jiyun Lee, Gihun Nam, Dongchan Min, Andrew Sun, Sam Pullen

Peer Reviewed

Abstract:	Integrity-assured navigation is essential to support highly automated operation of Urban Air Mobility (UAM) at lower altitudes in urban or suburban area. This paper develops a Network-based Augmentation System (NBAS) architecture which utilize GNSS pseudorange corrections and monitoring information of reference stations installed at multiple vertiports to improve navigation accuracy and integrity. A new monitoring concept of enhancing detection capability for spatially-decorrelated errors is proposed by combining information of vertiports located farther from users. Simulations are conducted to compare the performance of the NBAS system to that of the conventional Ground-based Augmentation Systems (GBAS) architecture (i.e., single reference station) assuming the use of a dual-frequency and dual-constellation (GPS and Galileo) GNSS and the dual-frequency divergence-free smoothing method. Simulation results show a significant reduction in both ionosphere-induced and ephemeris-failure threats by utilizing the multiple monitor capability of networked ground stations and UAM vehicles.
Published in:	Proceedings of the 2023 International Technical Meeting of The Institute of Navigation January 24 - 26, 2023 Hyatt Regency Long Beach Long Beach, California
Pages:	441 - 453
Cite this article:	Lee, Jiyun, Nam, Gihun, Min, Dongchan, Sun, Andrew, Pullen, Sam, "Network-Based Augmentation System (NBAS) Architectures Optimized to Support Urban Air Mobility (UAM)," Proceedings of the 2023 International Technical Meeting of The Institute of Navigation, Long Beach, California, January 2023, pp. 441-453. https://doi.org/10.33012/2023.18603
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