The upcoming Open Service Navigation Message Authentication (OSNMA) provided by the Galileo positioning system will revolutionize the robustness against interference and spoofing in satellite navigation systems (GNSS). Authentication will be a key asset even in embedded navigation solutions featuring a very low power GNSS chipset that cannot host the OSNMA functionality itself. Sony Semiconductor Solutions Corporation and Rokubun have partnered to demonstrate a solution for this specific use case.

Sony Semiconductor Solutions Corporation (SSS) and Rokubun have established a partnership to bring to the market a Galileo OSNMA ready solution for navigation and positioning that uses both SSS's CXD5610 GNSS chipset and Rokubun's SPEAR OSNMA SDK. This collaboration demonstrates that this combination can enhance the resilience of embedded navigation modules.

The collaboration between SSS and Rokubun has led to the successful processing of the Galileo OSNMA cryptographic material using the navigation message data provided by SSS's CXD5610 chipset to Rokubun's SPEAR OSNMA SDK. The validation of this integration was conducted using a series of tests based on a simulated Galileo OSNMA scenario.

Test Set up

A software-defined radio (SDR) replayed a synthetic OSNMA scenario generated by Rokubun to provide GNSS data for the validation experiments. Rokubun's MEDEA GNSS computer served as the reference, providing Galileo E1-B navigation bits. A Linux PC controlled the entire setup, sending raw GNSS I/Q data to the SDR, which then fed both SSS's CXD5610 and MEDEA GNSS devices. The MEDEA and CXD5610 devices streamed Galileo navigation data to two separate instances of the SPEAR OSNMA SDK, which produced authentication results.

Results

Results showed that the combination of CXD5610 and SPEAR OSNMA SDK was able to authenticate the Galileo satellites that were tracked for the generated synthetic scenario, as it is shown in the OSNMA authentication timeline of the next figure.

The partnership between SSS and Rokubun has led to a market ready solution to provide Galileo OSNMA authenticated navigation for any embedded navigation or timing device.