OSNMAlib Improvements and Real-Time Monitoring of Galileo OSNMA

Galileo will declare OSNMA (Open Service Navigation Message Authentication), a civil GNSS signal authentication scheme, operational in the near future. OSNMAlib, an open-source library that implements OSNMA, was presented two years ago after the test phase of the protocol started and has since undergone several upgrades. In this paper, we disclose these upgrades, which comprise new input sources, new features and optimizations, and the creation of an OSNMA real-time monitoring website. For each input source (SBF, UBX, GNSS-SDR and galmon), we describe how can they be integrated with an OSNMA library and what pitfalls to avoid. The new features include data retrieval and time to first authenticated fix optimizations and a new logging format aimed at researchers. This logging format is used in osnmalib.eu website to display, in a friendly and understandable way, the live Galileo and OSNMA messages and the OSNMAlib authentication output. Additionally, the website also provides the I/NAV data bits to help snapshot receivers and other GNSS-based applications.