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Session B3: Future Trends in GNSS Augmentation Systems

Development of the H-ARAIM/FDE Capability for an Aviation Receiver Prototype
Denis Bouvet, Bernadette Couteiro, Frederic Chauveau, Gregoire Jacotot, Thales
Date/Time: Thursday, Sep. 22, 9:43 a.m.

In the frame of the EDG2E project (Equipment for Dual frequency Galileo GPS and EGNOS), funded by the European Union Agency for the Space Programme (EUSPA), Thales is developing a Dual Frequency L1/L5 GPS / Galileo / SBAS prototype receiver. This prototype embeds an H-ARAIM/FDE capability based on the ARAIM Algorithm Definition Document. The first objective of the paper is to present systematically, from the determination of the faults to be monitored, to the calculation of the protection levels, the design choices made to limit computational load. A key-contributor being the designation of the faults to be monitored, the implemented H-ARAIM/FDE capability relies on the minimum integrity performance to be published in the ICAO SARPs to reduce the number of fault modes monitored, while maintaining the probability of non-monitored faults at an acceptable level. Another major contributor to the computation load is the computation by itself of the protection levels. Here, the baseline iterative method is modified to speed up the convergence to the protection level value and to limit the number of calls to the error function. The paper then presents the results obtained with the software executed on a hardware platform representative of the airborne equipment, including test procedure results (detection and exclusion) and computational load assessment. The conclusions of the paper discuss the limitations of the current prototype, and the activities needed for consolidating the implementation of the H-ARAIM/FDE capability in future multi-constellation airborne equipment.



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