Integrity monitoring of carrier phase-based ephemeris fault detection

Abstract

Ephemeris faults must be monitored when integrity is provided for safety–critical applications. The ground facility consisting of multiple short-baseline reference receivers is used to detect the ephemeris faults. The test statistic for the ephemeris fault monitoring is constructed by the double-differenced carrier phase observation. The false alarm and missed detection errors of the proposed ephemeris fault monitoring method are constrained by accounting for the effect of ephemeris fault and geometry-free ambiguity resolution failure simultaneously. Real BDS data with simulated ephemeris fault are utilized to test the proposed method. The experimental results have shown that the ephemeris fault can be detected by satisfying the required false alarm and missed detection probabilities. The detection power loss of the proposed method can be constrained at less than 0.1%. It has been proven that the real-time protection of the proposed method is achievable against Type A and Type B ephemeris faults.