GBAS ionospheric anomaly monitoring strategy using Kullback-Leibler divergence metric


A significant anomaly of nice importance for ground-primarily based augmentation systems (GBAS) is the steep gradient in ionospheric delays caused by rare ionospheric storms. To avoid such hazardous errors, code-carrier divergence (CCD) monitors are applied to support the employment of GBAS in Category I (CAT I) operation. However, to fulfill the stricter necessities for CAT II/III operation, it could be necessary to greatly improve the speed with which existing CCD monitors detect ionospheric gradients or develop an innovative divergence monitor. One manner of obtaining stricter integrity is to detect anomalous divergence behavior a lot of rapidly than the CCD monitor will. So, we tend to attempted to plan a divergence monitor in that the detection time is reduced by using the Kullback-Leibler info. In simulations and experimental results, we have a tendency to demonstrate that the proposed divergence live is sort of capable of detecting ionospheric anomalies that are hazardous to GBAS and is a very promising alternative for the detection of deviations. A comparison with existing CCD monitors shows its increased fault detectability, which enables it to sense even tiny ionospheric gradients a lot of rapidly than typical monitors.

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