Abstract
With the development of the Global Navigation Satellite System, the increased number of satellites has resulted in more fault hypothesis situations and subset solutions. This situation represents a new challenge for advanced receiver autonomous integrity monitoring (ARAIM) in terms of the computational load. To efficiently detect faults and reduce the computational load, a method based on the association between satellite features in the same orbital plane is proposed. This approach first tests subsets that exclude entire constellations to narrow the search range for faults. Next, we evaluate multiple-fault cases directly by utilizing the subsets that exclude entire orbit satellites. Compared with the baseline Multiple Hypothesis Solution Separation (MHSS) method, our method can clearly reduce the number of subsets and the computational time under a typical multi-constellation situation while satisfying the localizer precision vertical 200 performance requirement, i.e., the guidance supports approach operations down to 200-foot altitudes. Furthermore, the experimental results illustrate that the number of subsets is reduced at most by two orders of magnitude, from 1330 to 87, and the computational time is decreased by 66.6%. The effective monitoring threshold and the fault-free 10−7 error bound on the accuracy of our method are much closer to those of the baseline MHSS method, and the usability coverage of both methods reaches 100%. This study verifies that the monitoring subsets and the calculation time for ARAIM are dramatically reduced by the new method.
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Acknowledgements
The authors first thank Todd Walter, Juan Blanch, and Per Enge, whose study provided the authors with the ideas and foundations for the work we described, and their simulation results served as a reference for simulation analyses. The authors also thank the staff at the National Key Laboratory of CNS/ATM for their advice and interest. The work was conducted with financial support under the National Natural Science Foundation of China (Grant Nos. 61521091, 61501010, U1433114) and Aeronautics Science Foundation (Grant No. 2015ZC51035).
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Ge, Y., Wang, Z. & Zhu, Y. Reduced ARAIM monitoring subset method based on satellites in different orbital planes. GPS Solut 21, 1443–1456 (2017). https://doi.org/10.1007/s10291-017-0658-x
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DOI: https://doi.org/10.1007/s10291-017-0658-x