Impact of GPS Signal Shadowing on Ground-Based Augmentation System and Consideration of Methods to Reduce the Impact

Compared to airports in other countries, airports in Japan are narrow and it is difficult to secure a suitable site for reference stations of Ground-Based Augmentation System (GBAS). Even in Europe and the U.S., where there are large enough sites, the impact of aircraft passing overhead has been reported. First, the authors examined the impact of shadowing the GPS signals on GBAS. Next, based on the analysis of data acquired by the GBAS for evaluation purposes at New Chitose Airport, the authors evaluated the impact of GPS signal shadowing by landing aircraft on GBAS. Furthermore, based on the results of computer simulations, we proposed a method to reduce the impact of GPS signal shadowing by landing aircraft, and discussed the impact on the availability of GBAS.