分布式间歇干扰下基于SMI的GNSS空时自适应处理器性能分析

针对全球导航卫星系统接收机面临的分布式间歇干扰威胁，全面准确地分析了基于采样矩阵直接求逆方法的空时自适应处理(space-time adaptive processing, STAP)的抗干扰性能。在建立性能分析模型的基础上，根据间歇干扰造成的采样协方差矩阵不匹配情况，通过分类评估、梳理归纳、理论推导全面分析了不同情况下STAP的性能。分析结果表明在采样长度小于闪烁周期且使用预采用处理方法时，空时自适应处理器会出现漏采样，干扰抑制性能会急剧下降，漏采样出现的频率为各干扰闪烁频率之和。数值和仿真分析验证了理论分析的结果，在此基础上讨论了考虑分布式间歇干扰时STAP的优化设计。

Performance analysis of SMI based GNSS space-time adaptive processing under distributed intermittent interferences

Plasma has a unique protective effect against high-power microwave attack. Based on the plasma fluid approximation method, the time dependent evolution of the incident electric field during the interaction between high-power microwaves and columnar plasma arrays was studied by using COMSOL software, and the physical process and mechanism of plasma protection against high-power microwaves were analyzed. The results show that the incident high-power microwave will change the plasma parameters drastically, especially the electron density will increase sharply, so that the plasma will show metal-like electromagnetic properties to the incident high-power microwave, and finally realize the effective protection against the incident high-power microwave. In addition, the plasma protection against high-power microwaves was experimentally verified by using columnar plasma arrays generated by high-frequency glow discharge. Finally, the main problems to be solved for plasma-based high-power microwave protection technology were summarized.