New Integrity SBAS Test Bed NISTB - DFMC Simulation Results for EGNOS V3 Services

Kathrin Fielitz, Quirin Meindl, Andreas Breitenacher, Julian Daubrawa, Harald Frankenberger, Roland Braun, Andreas Schmitz-Peiffer, Anne Ridings, Manuel Marcote, Aitor Auz, Katarzyna Urbanska

Peer Reviewed

Abstract:	The "New Integrity SBAS Test Bed" (NISTB) testbed is an end-to-end SBAS simulator capable of processing synthetic and real data recorded by regional and global ground station networks. The testbed supports the provision of Single-Frequency (SF) as well as Dual-Frequency (DF) SBAS Services exploiting the GPS and Galileo data. The output of the testbed is SBAS data stream following the Single-Frequency MOPS ICD, respectively the Dual-Frequency Multi-Constellation (DFMC) SBAS ICD. The performances of the generated SBAS Services are assessed with the Performance Assessment Tools (PAT) which was also developed in the scope of the NISTB project. This paper focusses on demonstrations of DFMC SBAS Service performances generated with the NISTB testbed on the basis of real observation data for GPS and GPS+GAL recorded by the operational EGNOS V2 (EV2) RIMS and the Galileo GESS network, respectively. The achieved results are compared with each other and against the GPS SF (Legacy) Service broadcast by the operational EV2 system which was post-processed in the project. Thus, the results allow for comparing the SBAS performances of SF and DFMC Services (GPS SF Service vs. GPS DF Service on the basis of the EV2 ground station network), DFMC SBAS performances using different network geometries (EV2 ground station network vs. GESS ground station network for GPS DF Services) and different space segments (GPS vs. GPS+GAL Dual-Frequency Services on the basis of the GESS ground station network). The NISTB testbed results clearly confirm the benefit in service performance of the Dual-Frequency SBAS Service over the Single-Frequency Legacy SBAS Service in terms of service availability and continuity extending to much larger regions. On the level of accuracy, it can be observed that, in the presence of calm ionospheric conditions, a better positioning accuracy is still achieved in case of the Single-Frequency SBAS Service. This is due to the increase of noise and multipath effects when using dual-frequency measurements (i.e. iono-free linear combination of signals) at user level in case of DFMC services. However, it is noted that all SBAS services studied with NISTB, both the DFMC Services as well as the EV2 broadcast Legacy Service, are compliant with the positioning accuracy targets of the applicable service.
Published in:	Proceedings of the 31st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2018) September 24 - 28, 2018 Hyatt Regency Miami Miami, Florida
Pages:	2104 - 2118
Cite this article:	Fielitz, Kathrin, Meindl, Quirin, Breitenacher, Andreas, Daubrawa, Julian, Frankenberger, Harald, Braun, Roland, Schmitz-Peiffer, Andreas, Ridings, Anne, Marcote, Manuel, Auz, Aitor, Urbanska, Katarzyna, "New Integrity SBAS Test Bed NISTB - DFMC Simulation Results for EGNOS V3 Services," Proceedings of the 31st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2018), Miami, Florida, September 2018, pp. 2104-2118. https://doi.org/10.33012/2018.15848
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