论文标题
海报：用高精度时钟检测GNSS不当行为
POSTER: Detecting GNSS misbehaviour with high-precision clocks
论文作者
论文摘要
为了减轻针对全球导航卫星系统（GNSS）接收器的欺骗攻击，一种有前途的方法是依靠替代时间来源，例如基于网络的同步，以检测时钟抵消了由GNSS攻击引起的差异。但是，如果没有网络连接，则此类验证参考将无法可用。一个可行的选择是依靠当地时间参考；特别是，具有扩展持有功能的芯片尺度热稳定振荡器的精确硬件时钟组合。我们提出了初步的设计，并将结果与传统的精密时钟相比提供稳定参考的定制设备，其足迹和成本较小。该系统与现有的接收器体系结构完全兼容，这使得该解决方案对于大多数工业场景而言是可行的。与基于网络的同步的进一步集成可以提供一个完整的时间保证系统，并具有较高的短期和长期稳定性。
To mitigate spoofing attacks targeting global navigation satellite systems (GNSS) receivers, one promising method is to rely on alternative time sources, such as network-based synchronization, in order to detect clock offset discrepancies caused by GNSS attacks. However, in case of no network connectivity, such validation references would not be available. A viable option is to rely on a local time reference; in particular, precision hardware clock ensembles of chip-scale thermally stable oscillators with extended holdover capabilities. We present a preliminary design and results towards a custom device capable of providing a stable reference, with smaller footprint and cost compared to traditional precision clocks. The system is fully compatible with existing receiver architecture, making this solution feasible for most industrial scenarios. Further integration with network-based synchronization can provide a complete time assurance system, with high short- and long-term stability.
