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.
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Acknowledgements
The authors appreciate the Hong Kong Geodetic Survey Services for providing static BDS data. This research was jointly funded by the National Natural Science Foundation of China (Nos. 61773132, 61633008, 61803115), the National Key Research and Development Program (No. 2017YFE0131400), the 7th Generation Ultra Deep Water Drilling Unit Innovation Project sponsored by Chinese Ministry of Industry and Information Technology, the Heilongjiang Province research Science Fund for Distinguished Young Scholars (No. JC2018019), and the Fundamental Research Funds for Central Universities (Nos. HEUCFP201768, 3072019CF0401).
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Li, L., Liu, X., Jia, C. et al. Integrity monitoring of carrier phase-based ephemeris fault detection. GPS Solut 24, 43 (2020). https://doi.org/10.1007/s10291-020-0958-4
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DOI: https://doi.org/10.1007/s10291-020-0958-4