RTK+OSNMA Positioning for Road Applications: An Experimental Performance Analysis in Finland

Abstract

We compare the performance of dual-band (GPS L1/L2 and Galileo E1/E5a) real-time kinematic (RTK) positioning in an open sky and urban scenarios in southern Finland using two different authentication schemes: one using only satellites authenticated by Galileo’s open service navigation message authentication (OSNMA) service (which at the moment of our tests led to using only authenticated Galileo satellites) and the other with no authentication. The results show the actual trade-off between accuracy and availability vs. authenticity associated with using only OSNMA-authenticated satellites, while the authentication of only Galileo satellites is possible (e.g., a drop of RTK positioning availability from 96.67 to 86.01% in our open sky and from 73.55 to 18.65% in our urban scenarios, respectively), and an upper bound of the potential performance that could be reached in similar experimental conditions had the authentication of GPS satellites been supported (e.g., an overall 14 cm and 10.20 m 95% horizontal accuracy in our open sky and urban scenarios, with below 30, 20 and 10 cm during 97.39, 96.03 and 92.43% of the time in the open sky and 49.12, 45.96 and 39.63% in the urban scenarios, respectively).

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 ].…”