caa a22 4500 606162232 CHVBK 20210128100638.0 cr unu---uuuuu 210128e20150701xx s 000 0 eng 10.1007/s10291-014-0398-0 doi (NATIONALLICENCE)springer-10.1007/s10291-014-0398-0 GBAS ground monitoring requirements from an airworthiness perspective [Elektronische Daten] [Michael Felux, Jiyun Lee, Florian Holzapfel] 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. GBAS Approach Service Type 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 toward a runway. We show that with this method, it is sufficient to monitor for gradients in the range of about 450-550mm/km while current standards require detection already from 300mm/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. Springer-Verlag Berlin Heidelberg, 2014 GBAS nationallicence Ionosphere monitoring nationallicence Airworthiness assessment nationallicence Felux Michael German Aerospace Center (DLR), 82234, Oberpfaffenhofen, Wessling, Germany aut Lee Jiyun Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, 305-701, Daejeon, Republic of Korea aut Holzapfel Florian Technische Universität München, Lehrstuhl für Flugsystemdynamik, Boltzmannstrasse 15, 85748, Garching bei München, Germany aut GPS Solutions Springer Berlin Heidelberg 19/3(2015-07-01), 393-401 1080-5370 19:3<393 2015 19 10291 https://doi.org/10.1007/s10291-014-0398-0 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10291-014-0398-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Felux Michael German Aerospace Center (DLR), 82234, Oberpfaffenhofen, Wessling, Germany aut NATIONALLICENCE 700 1- Lee Jiyun Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, 305-701, Daejeon, Republic of Korea aut NATIONALLICENCE 700 1- Holzapfel Florian Technische Universität München, Lehrstuhl für Flugsystemdynamik, Boltzmannstrasse 15, 85748, Garching bei München, Germany aut NATIONALLICENCE 773 0- GPS Solutions Springer Berlin Heidelberg 19/3(2015-07-01), 393-401 1080-5370 19:3<393 2015 19 10291