Ionospheric Gradient Threat Mitigation in Future Dual Frequency GBAS

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...

Carrier Phase Ionospheric Gradient Ground Monitor for GBAS with Experimental Validation

This paper describes a Ground Based Augmentation System (GBAS) ground-based monitor capable of instantly detecting anomalous ionospheric gradients at the time of satellite acquisition. The monitor utilizes differential carrier phase measurements across multiple reference station baselines as the basis for detection. Performance analysis shows that the monitor is highly sensitive to the quality ...

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...

Availability Benefit of Future Dual Frequency GPS Avionics under Strong Ionospheric Scintillation

A Global Positioning System (GPS) receiver may lose carrier tracking lock to the GPS signal under deep and frequent fades due to ionospheric scintillation. The frequent loss of lock observed during a strong scintillation period from the past solar maximum can significantly reduce GPS aviation availability. However, the frequency diversity (L1 and L5 frequencies) from the future GPS is expected ...

GBAS safety assessment guidance related to anomalous ionospheric conditions