Review of SBAS authentication techniques

In response to the threat of vulnerability of satellite navigation systems to spoofing, which will seriously affect the impact of navigation, positioning and timing services. How to enhance the security of navigation system services has become one of the issues that need to be addressed in satellite navigation services. Satellite navigation signal authentication is an emerging technical means to enhance civil signal anti-spoofing in satellite navigation systems, and it is also one of the important development directions and research hotspots of major satellite navigation systems at present. As the core augmentation system of the satellite navigation system, the satellite-based augmentation system (SBAS) system is currently promoting the SBAS message authentication standard under the framework of the International Civil Aviation Organization (ICAO) with a view to providing SBAS message authentication service in the future. Along with the completion of the construction of China’s BeiDou satellite-based augmentation system and the design and development of the next-generation BeiDou navigation system, the BeiDou satellite-based augmentation system needs to consider the provision of SBAS message authentication services under the framework of ICAO standards, in order to provide users with more secure and trustworthy PNT services. This paper firstly elaborates on the concept of SBAS message authentication, then combs through the development history of SBAS message authentication, and then analyzes the hot issues faced by SBAS message authentication technology, which will provide technical support for the subsequent message authentication service of BeiDou satellite-based augmentation system.