Systems and methods using multi frequency satellite measurements to mitigate spatial decorrelation errors caused by ionosphere delays

摘要

Systems and methods for using multi frequency satellite measurements to mitigate spatial decorrelation errors caused by ionosphere delays are provided. In one embodiment, a GBAS comprises: a plurality of GNSS reference receivers that receive signals from GNSS satellites; at least one processing module; at least one aircraft communication device; wherein the processing module determines a TEC along a line of sight of a first observable multi-frequency GNSS satellite to determine a current quality metric of the ionosphere; determines at least one overbounded Vertical Ionosphere Gradient standard deviation sigma-vig (σ_vig) when the current quality metric of the ionosphere meets a threshold; defines one or more valid iono regions at a given finite period in time where at least one σ_vig is applicable; and causes the communication device to communicate to an aircraft the σ_vig and a list of GNSS single and multi-frequency satellites having pierce points in the valid iono regions.