An Experimental Performance Assessment of Galileo OSNMA

Abstract

We present Galileo Open Service Navigation Message Authentication (OSNMA) observed operational information and key performance indicators (KPIs) from the analysis of a ten-day-long dataset collected in static open-sky conditions in southern Finland and using our in-house-developed OSNMA implementation. In particular, we present a timeline with authentication-related events, such as authentication status and type, dropped navigation pages, and failed cyclic redundancy checks. We also report other KPIs, such as the number of simultaneously authenticated satellites over time, time to first authenticated fix, and percentage of authenticated fixes, and we evaluate the accuracy of the authenticated position solution. We also study how satellite visibility affects these figures. Finally, we analyze situations where it was not possible to reach an authenticated fix, and offer our findings on the observed patterns.

An Enhanced FGI-GSRx Software-Defined Receiver for the Execution of Long Datasets

“…OSNMA testing on an SDR also requires the processing of longer datasets along with the need for faster processing. The Finnish Geospatial Research Institute (FGI) developed an open-source Python engine, FGI-OSNMA, for OSNMA-based navigation message authentication [ 38 ] of the Galileo E1B signal [ 39 , 40 , 41 ]. In a recent development, FGI-OSNMA has been incorporated with the FGI-GSRx software receiver to enable an OSNMA-based position authentication capability [ 42 ].…”