GAST C and GAST D performance analysis based on BeiDou navigation satellite system

BeiDou Navigation Satellite System is called BeiDou System for short, with the abbreviation as BDS. When fully deployed, the space constellation of BDS consists of five Geostationary Earth Orbit (GEO) satellites, twenty-seven Medium Earth Orbit (MEO) satellites and three Inclined Geosynchronous Satellite Orbit (IGSO) satellites. By the end of 2012, there are five GEO, four MEO and five IGSO BeiDou navigation satellites in orbit. BDS Signal-In-Space Interface Control Document (ICD) is issued by the China Satellite Navigation Office on December 27, 2012. In China, BDS will be used as the primary navigation system for civil aviation, especially for the approach and landing operation section. Ground-based augmentation systems (GBAS) for satellite navigation are intended to replace the Instrument Landing System (ILS) for precision approach of aircraft into an airport in the near future. In China, many airports will install GBAS ground system, especially for the plateau airports such as LinZhi airport, which is surrounded by high mountains that are clouded with mist. Hence, the accuracy and the coverage of the traditional navigation aids, such as the ILS, are limited. Moreover, strong winds and a large temperature difference between day and night at the airport location significantly shorten the lifespan of the equipment. Therefore, it is urgent and important to develop GBAS based on BDS in China. In the paper, we estimate and analyze the performance of GBAS Approach Service Type C (GAST C) and GBAS Approach Service Type D (GAST D) in China. Firstly, GBAS Signal-in-Space Interface Control Document (ICD) based on BDS is proposed. As follows, the key parameters on the integrity monitor are discussed. Then, the ionosphere storm monitor methods are analyzed. Finally, some simulations are implemented.