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GBAS Ground Monitoring Requirements from an Airworthiness Perspective

Felux, Michael and Lee, Jiyun and Holzapfel, Florian (2015) GBAS Ground Monitoring Requirements from an Airworthiness Perspective. GPS Solutions, 19 (3), pp. 393-401. Springer. DOI: 10.1007/s10291-014-0398-0 ISSN 1080-5370

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Official URL: http://link.springer.com/article/10.1007/s10291-014-0398-0


The Ground Based Augmentation System (GBAS) provides corrections for satellite navigation signals together with integrity parameters to aircraft and enables precision approach guidance. It will eventually replace the currently used Instrument Landing System (ILS). GBAS Approach Service Type (GAST) C stations supporting CAT-I operations have been fully developed and certified and first stations are operational. For the service type D, which is intended to support CAT-III operations including automatic approaches and landings, requirements have been drafted and are currently undergoing validation. One remaining issue is the requirement for monitoring of ionospheric anomalies in the ground subsystem. Large gradients in the concentration of free electrons in the ionosphere can lead to significant positioning errors when navigation is based on differential methods. We give a review of the derivation of currently proposed performance requirements for such a monitor. Next, we show that the required level of safety from an airworthiness perspective can be achieved even with relaxed monitoring requirements compared to the currently drafted standards. These relaxations result from satellite geometry assessments on the ground and actual approach characteristics towards a runway. We show that with this method it is sufficient to monitor for gradients in the range of about 450-550 mm/km while current standards require detection already from 300 mm/km. A remote monitoring receiver near the touchdown point can monitor the post-correction differential range error and use it as test statistic for GBAS performance monitoring and protection against ionospheric disturbances.

Item URL in elib:https://elib.dlr.de/89901/
Document Type:Article
Title:GBAS Ground Monitoring Requirements from an Airworthiness Perspective
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Felux, Michaelmichael.felux (at) dlr.deUNSPECIFIED
Holzapfel, FlorianTechnische Universität MünchenUNSPECIFIED
Date:July 2015
Journal or Publication Title:GPS Solutions
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1007/s10291-014-0398-0
Page Range:pp. 393-401
Keywords:GBAS, airworthiness assessment, ground monitoring
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:22 Jun 2015 11:14
Last Modified:31 Jul 2019 19:47

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