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Publication type: Conference paper
Type of review: Peer review (publication)
Title: Flight testing GBAS for UAV operations
Authors: Felux, Michael
Jochems, Sophie
Schnüriger, Philipp
Fischer, Valentin
Steiner, Patrick
Jäger, Michael
Sarperi, Luciano
Cacciopoli, Natali
et. al: No
DOI: 10.33012/2022.18428
Proceedings: Proceedings of the 35th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2022)
Page(s): 1576
Pages to: 1588
Conference details: 35th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2022), Denver, USA, 19-23 September 2022
Issue Date: Sep-2022
Publisher / Ed. Institution: Institute of Navigation
ISBN: 978-0-936406-32-9
ISSN: 2331-5954
Language: English
Subjects: GBAS; UAV; Navigation
Subject (DDC): 629: Aeronautical, automotive engineering
Abstract: In this study the concept of using GBAS corrections and integrity parameters for UAV operations is explored. The GBAS messages are received and decoded at the airport to overcome the issue of VDB coverage for alternative applications that do not have line-of-sight to the GBAS. A flight test at a distance of about 15 km from an operational GBAS ground station was conducted using a quad-rotor UAV as test vehicle. The recorded GBAS messages and recorded pseudoranges and carrier phases were subsequently used to evaluate the performance that can be obtained. One main issue that was identified is the number of satellites lost when maneuvering the drone. Loss of tracking requires a re-initialization of the smoothing filter and thus entails a wait time before a satellite can be used for positioning again. The GBAS corrections are generated based on 100 s smoothing, requiring a user to use the same smoothing time constant do avoid potential differential error buildups due to different filters. Hence, the time until a satellite can be used again after reacquisition may be substantial. When losing several satellites simultaneously or shortly after another this decreases the number of available satellites significantly and negatively impacts accuracy and protection level performance of this proposed mode of operation. The paper also studies the multipath effect at different altitudes and for different smoothing time constants compared to the standardized error models that were defined for large transport aircraft. When using 100 s smoothing the results indicate that the models are suitable also for the use case of UAV operations.
Fulltext version: Published version
License (according to publishing contract): Licence according to publishing contract
Restricted until: 2023-03-30
Departement: School of Engineering
Organisational Unit: Centre for Aviation (ZAV)
Appears in collections:Publikationen School of Engineering

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