复杂干扰环境下的卫星授时接收机加固技术

对目前导航卫星授时接收机面临的干扰模型和应对措施进行了归纳总结。结合授时接收机工作原理和特点,给出了授时接收机加固的通用框架。在此基础上,对授时接收机加固技术的发展趋势进行了分析,提出了基于钟差辅助和网络辅助的两种干扰检测方法。前者充分利用了多系统多卫星钟差数据的冗余性和本地时钟的特性,后者则利用了授时接收机网络具备数据通信和广域覆盖的特点。通过干扰检测结果给出完好性评估并引导授时接收机的工作模式,可以提升复杂干扰环境下卫星授时的可靠性和完好性。

Timing Receiver Toughen Technique in Complicated Jamming Environments

GNSS timing receiver is widely applied in national economic base infrastructure, such as power grid, communication station and finance system. Usually, the present GNSS timing receivers did not have the ability of detect jamming and spoofing attacks, vulnerable to jamming and spoofing attack to get wrong timing information enven to cause great harm. The threat models and spoofing attack detection technology are summarized is this paper. Combined with the operating principle and characteristics of timing receiver, a general architecture of timing receiver reinforcement technology is presented. On this basis, two interference detection methods have been proposed. One is clock aided method, which taking the advantage of multi satellite clock difference redundancy and the local clock characteristics based on multi-source clock data fusion; the other is network aided method, which can be used for interference detection, evaluation even positioning with the help of data mining of signal parameters and calculation results through the entire network. The interference detection results can be used to integrity assessment and guide the GNSS timing receiver working mode, thus improving the satellite timing reliability and integrity in complicated interference environment.