GBAS基准站布设方案设计与评估方法

The layout of ground-based augmentation system (GBAS) reference stations will directly impact the accuracy and integrity performance of GBAS, and it is closely related to the airport conditions, the satellite constellations used and the local ionospheric environment. However, the published documents such as Federal Aviation Administration (FAA) GBAS siting order only give basic requirements of reference station layout and do not deeply take the impact of the above points into account. Therefore, the study on design and evaluation strategy for GBAS reference station layout is very important. By comparing the different GBAS reference station layouts and the broadcast pseudorange correction error standard deviations of five airports based on collected data, analyzing the impact of the number of reference stations on the GBAS protection levels, and studying the impact of baseline length on the performance of ephemeris fault monitor and anomalous ionospheric gradient monitor, a design and evaluation strategy for GBAS reference station layout is proposed, which is supplemented by four sample schemes for V-shape runways. The proposed strategy can provide a reference for the design and determination of appropriate layouts based on specific airport conditions and the requirements of ephemeris fault monitor and anomalous ionospheric gradient monitor.