AI 中文总结
该研究提出开源SDR仿真平台GalSAS-SDR-SIM，模拟伽利略SAS工作流程，可灵活配置参数、生成多频段信号，为接收机开发和信号认证研究提供实用工具。
AI 中文摘要
伽利略正在开发信号认证服务（SAS），该服务将E1频段的开放服务导航消息认证（OSNMA）与E6频段的扩频码认证（SCA）相结合，以增强其对抗欺骗攻击的能力。由于伽利略SAS仍在开发中，获取真实且可控的SAS信号仍然有限，这阻碍了兼容接收机的早期开发以及信号认证相关的可复现研究。为了填补这一空白，本文提出了GalSAS-SDR-SIM，这是一个开源软件定义无线电（SDR）仿真平台，通过将E6扩频码加密与OSNMA密钥披露过程相结合来模拟SAS工作流程。该平台允许灵活配置SAS的扩频码加密参数，以适配不同计算能力的接收机；还支持针对用户自定义的位置和时间，并发生成伽利略E1、E5b和E6信号，以及OSNMA跨卫星配置。实验结果表明，该平台可同时验证导航消息和扩频码，研究人员进一步评估了不同SAS配置下的SAS认证性能与计算资源成本。GalSAS-SDR-SIM依据公开的官方规范实现，为加速支持SAS的接收机开发，以及支持研究界评估和改进伽利略信号认证技术提供了实用工具。
英文摘要
Galileo is developing a Signal Authentication Service (SAS) that integrates Open Service Navigation Message Authentication (OSNMA) on the E1 band with Spreading Code Authentication (SCA) on the E6 band to strengthen its resilience to spoofing attacks. As Galileo SAS is still under development, access to realistic and controllable SAS signals remains limited, hindering both the early development of compatible receivers and reproducible research on signal authentication. To bridge this gap, this paper presents GalSAS-SDR-SIM, an open-source software-defined radio (SDR) simulation platform that emulates the SAS workflow by coupling E6 code encryption with the OSNMA key-disclosure process. The platform allows flexible SAS configuration of code encryption parameters to accommodate receivers with different computational capabilities. It also supports the concurrent generation of Galileo E1, E5b, and E6 signals for user-defined locations and times, and OSNMA cross-satellite configurations. Experimental results demonstrate simultaneous verification of navigation messages and spreading codes. We further evaluate SAS authentication performance and computational resource costs under different SAS configurations. Implemented according to publicly available official specifications, GalSAS-SDR-SIM provides a practical tool for accelerating SAS-capable receiver development and supporting the research community in evaluating and improving Galileo signal-authentication techniques.
Comments10 pages, 15 figures
