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Airborne Ionospheric Gradient Monitoring for Dual-Frequency GBAS

Gerbeth, Daniel and Caamano, Maria and Circiu, Mihaela-Simona and Felux, Michael (2022) Airborne Ionospheric Gradient Monitoring for Dual-Frequency GBAS. In: 2022 International Technical Meeting of The Institute of Navigation, ITM 2022. International Technical Meeting ITM/PTTI 2022, 2022-01-25 - 2022-01-27, Long Beach, CA, USA. doi: 10.33012/2022.18179. ISBN 978-093640630-5. ISSN 2330-3646.

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Certified Ground Based Augmentation Systems (GBAS) as of today operate using only GPS signals in the L1 frequency band to enable precision approach guidance for landing aircraft. Ionospheric activity (i.e., scintillations and/or large abnormal ionospheric gradients) is a major limitation for the availability of current GBAS services, especially in equatorial and polar regions. To overcome these availability limitations, current developments aim at extending GBAS to the use of dual-frequency and multi-constellation (DFMC) techniques. Using signals on a second frequency, in this case L5/E5a, allows for a less conservative ionospheric monitoring, improving the availability of GBAS in regions with high ionospheric activity. In previous work, we proposed an airborne ionospheric gradient monitoring concept to detect significant ionospheric delay differences between a GBAS ground station and an airborne user. This concept was initially developed for the assumption of a single satellite affected by an ionospheric gradient. While extending it for case with multiple satellites simultaneously affected, the proposed monitoring thresholds were getting extremely sensitive with a consequent raise of the false alarm probability of the monitor. Furthermore, the concurrent impact of an ionospheric gradient on multiple satellites could deteriorate the monitoring performance, and thus the detectability. In this work, we revisit the previously proposed monitoring scheme to improve its robustness, especially in the situation when several satellites are affected simultaneously. This is achieved through a median removal step, which makes the quantities derived from the pseudorange corrections from the ground station and the ionospheric delay estimates derived from dual-frequency pseudorange measurements from the aircraft comparable without adding a bias to the unaffected satellites. In addition, we propose a method to monitor all satellites currently in use at once, avoiding the need to make conservative assumptions about the maximum number of affected satellites

Item URL in elib:https://elib.dlr.de/200565/
Document Type:Conference or Workshop Item (Speech)
Title:Airborne Ionospheric Gradient Monitoring for Dual-Frequency GBAS
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Gerbeth, DanielUNSPECIFIEDhttps://orcid.org/0000-0002-7495-7361148179240
Caamano, MariaUNSPECIFIEDhttps://orcid.org/0000-0002-8630-3074UNSPECIFIED
Circiu, Mihaela-SimonaUNSPECIFIEDhttps://orcid.org/0000-0003-4430-0526UNSPECIFIED
Felux, MichaelUNSPECIFIEDhttps://orcid.org/0000-0002-8368-4422UNSPECIFIED
Journal or Publication Title:2022 International Technical Meeting of The Institute of Navigation, ITM 2022
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:GBAS, GNSS, Ionospheric Monitoring
Event Title:International Technical Meeting ITM/PTTI 2022
Event Location:Long Beach, CA, USA
Event Type:international Conference
Event Start Date:25 January 2022
Event End Date:27 January 2022
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Air Transportation and Impact
DLR - Research area:Aeronautics
DLR - Program:L AI - Air Transportation and Impact
DLR - Research theme (Project):L - Cyber-Security Centric Communication, Navigation and Surveillance
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation > Navigation
Deposited By: Gerbeth, Daniel
Deposited On:06 Dec 2023 12:58
Last Modified:24 Apr 2024 21:01

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