Assistant Professor
Department of Aeronautical and Aviation Engineering
The Hong Kong Polytechnic University
Research interests : Air Navigation, Satellite Navigation

Speech title :Dual-frequency Multi-constellation Ground Based Augmentation System (GBAS)  --Challenges and Methodology Study

Abstract  : Ground-Based Augmentation System (GBAS) has demonstrated a strong safety record for civil aviation based on GPS L1 over the past decade. With the rapid development of dual-frequency multi-constellation (DFMC) GNSS, including GPS L5, Galileo E5a, and BeiDou B2a/B1C signals, GBAS is expected to provide enhanced availability, continuity, and accuracy for future precision approach operations. However, the introduction of multiple frequencies and constellations also significantly increases the complexity of integrity monitoring, requiring more rigorous treatment of satellite, signal, and ionospheric threats.
This talk presents recent research progress and key technical challenges in DFMC GBAS integrity monitoring. The discussion begins with the evolution from conventional GPS L1 GBAS to modern DFMC architectures. Particular attention is given to major threat sources relevant to CAT III GBAS, including satellite ephemeris and clock faults, code-carrier divergence, ionospheric anomalies, and signal deformation. Methodologies developed by our research group for detecting, bounding, and mitigating these threats are introduced, together with validation results demonstrating compliance with stringent aviation integrity requirements. The talk also examines recent observations of BeiDou-3 satellite clock, group delay behavior, and signal deformation threats are analyzed for BeiDou B1C signals.
Overall, this presentation emphasizes that DFMC GBAS is not merely an accuracy enhancement over legacy systems, but a comprehensive integrity challenge. Robust monitoring of satellite faults, ionospheric disturbances, and signal anomalies is essential to ensure that future GBAS can safely support high-precision and high-integrity aircraft approach and landing operations.

Bio:
Dr. Yiping Jiang is an Assistant Professor at The Hong Kong Polytechnic University, specializing in satellite navigation, air navigation, and aviation integrity. She received her PhD from The University of New South Wales, Australia, and previously earned her Master’s and Bachelor’s degrees from Beihang University. Before joining PolyU, he worked as a postdoctoral fellow at École Nationale de l’Aviation Civile (ENAC), France, where he participated in the SESAR Dual-Frequency Multi-Constellation GBAS project, and also gained industry experience at DJI and Airbus. Her research focuses on GNSS integrity monitoring, GBAS, ARAIM, ionospheric and tropospheric anomaly monitoring, satellite ephemeris/clock fault detection, and high-integrity positioning for aviation and intelligent transportation. She has led multiple competitive research grants from RGC, NSFC, the Smart Traffic Fund, and has published over 40 SCI journal papers, with extensive contributions to GPS Solutions, Navigation, and IEEE journals. She also serves the international navigation community as a session chair for major ION conferences, guest editor, keynote speaker and IAG working group member.