Development of the Ionospheric Anomaly Detection Method for GBAS

Abstract

Global positioning system (GPS) can provide the position velocity and time (PVT) information for almost anywhere on Earth However stand-alone GPS cannot meet the real-time integrity monitoring capability necessary to meet the civil aviation navigation safety requirements That is stand-alone GPS cannot meet the required navigation performance (RNP) for civil aviation approaches and landings In order to improve GPS performance and enhance its integrity the ground-based augmentation system (GBAS) is recommended by the international civil aviation organization (ICAO) as a solution to augment GPS for category I (CAT I) approaches and landings In order to improve the navigation service performance in the Taipei flight information region (FIR) the Taiwan civil aeronautics administration (CAA) plans to implement a GBAS in the Taipei FIR In order to validate the GBAS design in Taiwan in this thesis we evaluate the real-time operation of the GBAS ground facility prototype the integrity monitor test-bed (IMT) After the designs of the real-time GBAS ground facility prototype and the associated user platform are validated the developed system is used as a test bed for assessing ionospheric anomalies Since Taiwan is located in a middle and low-latitude region anomalies due to the ionosphere are the major concern for GBAS implementation and operation In order to help GBAS users avoid anomalies due to the ionosphere we propose several detection methods to monitor such anomalies Also we need an integrated detection method to combine the advantages of each detection method After that if the system detects an anomaly it will alert the GBAS users in order to avoid any negative consequences In this thesis we simulate different severities of the ionospheric anomaly model and analyze each corresponding effect for the detection methods that we establish Also we collected the real GPS data to validate the proposed integrated detection method Finally it was concluded that we can improve the integrity and safety of civil aviation with the GBAS in Taiwan during an ionospheric anomaly

Date of Award	2015 Jul 30
Original language	English
Supervisor	Shau-Shiun Jan (Supervisor)