Ground-based augmentation systems (GBAS) for satellite navigation are intended to replace the instrument landing system for precision approach of aircraft into an airport in the near future. Here, we show an evaluation of data collected during flight trials with the GBAS testbed of the German aerospace center with respect to requirements for the GBAS approach service type D. This service will permit approach and landing down to the zero visibility conditions of category IIIc approaches. We show output of all airborne monitors and the results of an integrity analysis. During all flight trials, the system performed within the required criteria for integrity, continuity, and availability.

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Lausanne (EPFL) BIOGRAPHIES Omar García Crespillo holds a M.Sc. in Telecommunication Engineering from the University of Malaga in Spain. In 2013, he joined the Navigation department of the German Aerospace Center (DLR) where his current field of research includes multi-sensor fusion algorithms, GNSS, inertial sensors and integrity monitoring for safe ground and air transportation systems. Since 2015, he is also a PhD student at the Swiss Federal Institute of Technology (EPFL) in Lausanne. Alice Andreetti is currently a last year Master student in Environmental Engineering at the Swiss Federal Institute of Technology in Lausanne (EPFL). She chose the specialization in environmental monitoring and modeling and she is currently working on the master thesis in the field of GNSS positioning. She received in 2017 the bachelor degree from the same university in Environmental Science and Engineering. In 2019 she stayed at the German Aerospace Center (DLR) for a 4 months internship.

Ground transportation systems demand accurate and robust localization functions. Satellite navigation is considered a key element in those systems, but its position determination can be highly corrupted in urban environments because of the presence of reflected signals (i.e. multipath). This paper deals with the detection of multipath in the code measurements of GNSS receivers for mobile users in urban scenarios. First, we discuss the different alternatives and limitations to properly isolate multipath autonomously at the receiver based on Code-Minus-Carrier (CMC) techniques in challenging GNSS applications. We then propose a practical methodology to design a suitable multipath detector based on the time difference of CMC. All the analysis and evaluations are supported with real measurements collected in Railway scenarios.