The current Category-I GBAS architecture uses only single frequency signal, the current architecture may not be able to meet GBAS performance requirements under the large ionospheric gradients because of spatial ionospheric de-correlation between the GBAS ground station and aviation users. In this paper, we propose a RAIM based airborne monitoring algorithm using the differential Hatch filters for ionosphere anomaly detection in position domain to detect more quickly and accurately. In simulation results, it demonstrated that the proposed scheme is capable of detecting ionosphere anomaly on worst cases in 4 seconds.
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