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

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 Constellation 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 which level of integrity and accuracy is needed for CAT II and CAT III performances, considering the new innovated Binary Offset Carrier (BOC) modulation and the increased power of +6 dB in Galileo signals. The results showed a promising performance of Galileo over Europe space.