Assessing Availability of GNSS-GBAS Landing Systems in GAST-D/F Performance

Abstract

The Ground-Based Augmentation System (GBAS) has been recently approved as CAT II performance (GBAS Approach Type D (GAST-D)) for the precision approach operations, and by using the GPS signals only. But the requirements of CAT III performance (GAST-F) are tended to be approved using dual Const ellation by adding the European Galileo system. In this research, the availability of CAT III was assessed using Galileo system. A simulation tool was used to estimate whic h level of integrity and accuracy is needed for CAT II and CAT III performances, conside ring the new innovated Binary Offset Carrier (BOC) modulation and the increased p ower of +6 dB in Galileo signals. The results showed a promising performance of Galileo over Europe space.