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Experimental Validation of an Ionospheric Monitoring Scheme for Dual Frequency GBAS

Felux, Michael and Circiu, Mihaela-Simona and Gerbeth, Daniel and Caamano Albuerne, Maria (2016) Experimental Validation of an Ionospheric Monitoring Scheme for Dual Frequency GBAS. In: Proceedings of the ION GNSS+ 2016. ION GNSS+ 2016, 14-16 Sep 2016, Portland, OR, USA.

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Official URL: http://www.ion.org/gnss/abstracts.cfm?paperID=4189


In this paper we describe a method to monitor for a difference in the ionospheric delay observed by a ground station of a Ground Based Augmentation System (GBAS) and an airborne user. In case of detection the affected satellite can be excluded or a switch to an ionospheric free processing mode can be triggered. As it is not possible to estimate the absolute ionospheric delay at the ground station from the transmitted corrections directly, we compare a pseudo-ionospheric delay estimate from the corrections with an ionospheric estimate after removing biases. We then show the performance of the proposed monitoring architecture in flight trials from our GBAS test environment for different scenarios. In order to obtain results for a full constellation we considered an L1/L2 dual frequency combination where the expected noise and multipath is larger than in the L1/L5 case which will be used in an operational GBAS. Results show that even with the larger test statistic and in the single constellation case the monitor is feasible and provides good results. Furthermore, we also show results using the available L5/E5a signals collected during flight tests. Also in this case the performance is good and the threshold was not exceeded despite the low threshold of the monitor due to the marginal geometry. In order to test the reaction of the monitor to ionospheric gradients we injected a simulated error into the airborne measurements. As the monitoring threshold depends on the satellite geometry we show some exemplary results of the impact of different gradient slopes on the test statistic of the affected satellites.

Item URL in elib:https://elib.dlr.de/106159/
Document Type:Conference or Workshop Item (Speech)
Title:Experimental Validation of an Ionospheric Monitoring Scheme for Dual Frequency GBAS
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Felux, MichaelMichael.Felux (at) dlr.dehttps://orcid.org/0000-0002-8368-4422
Circiu, Mihaela-SimonaMihaela-Simona.Circiu (at) dlr.deUNSPECIFIED
Gerbeth, DanielDaniel.Gerbeth (at) dlr.dehttps://orcid.org/0000-0002-7495-7361
Caamano Albuerne, MariaMaria.CaamanoAlbuerne (at) dlr.deUNSPECIFIED
Date:September 2016
Journal or Publication Title:Proceedings of the ION GNSS+ 2016
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:GBAS, Multi frequency, Multi constellation, ionospheric monitoring
Event Title:ION GNSS+ 2016
Event Location:Portland, OR, USA
Event Type:international Conference
Event Dates:14-16 Sep 2016
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:air traffic management and operations
DLR - Research area:Aeronautics
DLR - Program:L AO - Air Traffic Management and Operation
DLR - Research theme (Project):L - Communication, Navigation and Surveillance
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation > Navigation
Deposited By: Felux, Michael
Deposited On:21 Sep 2016 10:27
Last Modified:31 Jul 2019 20:03

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