Closed‐form analysis of undetected range errors due to ionospheric impacts for GBAS category I operations

Sensitivity of Category I Precision Approach Availability to Ionospheric Monitoring

The performance of a GPS augmentation system supporting Category I (CAT I) Precision Approach (PA) service availability is highly dependent on the selection of Ionospheric Grid Points (IGPs) and satellite mask. By defining the IGP grid mask and minimum satellite elevation angle, this paper provides the criteria necessary to achieve various levels of PA CAT I availability. Together with bounds o...

GBAS safety assessment guidance related to anomalous ionospheric conditions

Assessment of Ionospheric Gradient Impacts on Ground-Based Augmentation System (GBAS) Data in Guangdong Province, China

Ionospheric delay is one of the largest and most variable sources of error for Ground-Based Augmentation System (GBAS) users because inospheric activity is unpredictable. Under normal conditions, GBAS eliminates ionospheric delays, but during extreme ionospheric storms, GBAS users and GBAS ground facilities may experience different ionospheric delays, leading to considerable differential errors...

GBAS Differentially Corrected Positioning Service Ionospheric Anomaly Errors Evaluated in an Operational Context

Tim Murphy is Technical Fellow with Boeing Commercial Airplanes where he is a member of the Electronic Systems organization. Tim has 25 years of experience in radio navigation communications and surveillance systems for civil aviation. The current focus of his work is avionics for new airplane product development, and next generation CNS technologies to support Air Traffic Management including ...

GBAS Ionospheric Anomaly Monitoring Based on a Two-Step Approach

As one significant component of space environmental weather, the ionosphere has to be monitored using Global Positioning System (GPS) receivers for the Ground-Based Augmentation System (GBAS). This is because an ionospheric anomaly can pose a potential threat for GBAS to support safety-critical services. The traditional code-carrier divergence (CCD) methods, which have been widely used to detec...