Research On Integrity Algorithm And Application Of Ground Based Augmentation System Based On GNSS

Before the GBAS appeared,the aircraft used the traditional inertial navigation system and the instrument landing system during the flight and near landing.However,both of them have some drawbacks.Due to the increasing demand for airport throughput,the traditional way is unable to meet the current requirements due to technical and environmental constraints.Meanwhile,with the progress of BeiDou Navigation Satellite System(BDS)global networking process.GBAS based on GNSS integrated navigation has become a hot spot of current research.In aeronautical applications,GBAS can remarkable improve the flight efficiency and flight safety of the aircraft.The foundation augmentation system is a new generation approach landing system proposed by ICAO in accordance with the further requirements of navigation performance.In recent years,Both at domestic and foreign are vigorously promote the research and development and usability verification experiments of GBAS,aiming to replace the traditional instrument landing system(ILS)in the future to become the main way of aircraft landing.In order to improve the positioning accuracy and fault monitoring performance of the system,this paper mainly studies the performance indicators such as accuracy,integrity,continuity and availability,and makes use of the experimental data for simulation analysis.In this study,airborne positioning precision of GBAS based on quasi RTK,multi system integrated navigation GBAS enhancement technology,and GBAS integrity enhancement technology based on pseudo satellite be studied.In this study,the emphasis is on the analysis of GBAS positioning accuracy,multi reference consistency monitoring and protection level.The results show that quasi RTK technology can reduce the error.Multi system integrated navigation GBAS enhancement technology and ground-based pseudo satellite augmentation technology can remarkable improve the positioning accuracy,integrity,continuity and availability of the system than single system.The system can meet the security level requirements of the airport precision approaching and landing of CAT ?/?.By studying the algorithm and application of ground-based augmentation system based on GNSS,it solves the problems of traditional positioning method,such as low positioning accuracy,failure to implement effective fault monitoring and so on.Civil aviation aircraft can achieve all-weather,global,real-time continuous precision access to navigation and integrity services.