USING SPACE-BASED AUGMENTATION SYSTEM (SBAS) GRID IONOSPHERE VERTICAL ERROR (GIVE) INFORMATION TO MITIGATE IONOSPHERE ERRORS FOR GROUND BASED AUGMENTATION SYSTEMS (GBAS)

摘要

GBAS includes reference receivers, processing module, and communication device. Processing module checks GNSS satellite measurements to determine proximity of GNSS satellite measurement's IPP to IGPs derived from SBAS geostationary satellites. Processing module determines that GNSS satellite measurement is safe for mitigation using overbounded Vertical Ionosphere Gradient standard deviation sigma-vig (σ_vig) when IGPs possess acceptable GIVE values. Processing module determines whether number of GNSS satellite measurements determined safe for mitigation using σ_vig are able to produce VPL that meets VAL required for precision approach. Communication device communicates overbounded σ_vig along with differential corrections and indication of which GNSS satellite measurements that are safe for mitigation using at least one overbounded σ_vig are able to produce VPL that meets VAL required for precision approach to GNSS receiver when number of GNSS satellite measurements determined safe for mitigation using overbounded σ_vig are able to produce VPL that meets VAL required for precision approach.