GNSS欺骗干扰的空时联合检测算法

Space-time Joint Detection Algorithm for GNSS Spoofing Interference

当转发式欺骗干扰与真实有用卫星信号间时延较小时,传统基于码相关的时延特征检测欺骗信号的方法就会失效。为此,将欺骗干扰信号和真实卫星信号之间的时延和波达方向作为欺骗信号的识别特征,提出了一种针对小时延欺骗干扰的空时二维联合检测算法。新方法首先检查不同信号的波达方向,然后通过并行多个数字波束形成器进行空间滤波,最后根据码相关器输出检查不同信号延时,最终检测出欺骗信号来向。在对算法检测性能进行分析的基础上,通过MATLAB仿真验证了算法的正确性。

If the delay between the forwarded spoofing interference and the useful signal is too small in GNSS,the code correlation methodology in traditional way will fail unfortunately.So a space-time two-dimensional joint detection algorithm is proposed for the spoofing interference detection,where the time delay and the DOA about spoofing interference and desired signal are token as the identification features.Using the new algorithm,the DOAs of all received signals were estimated firstly.Then the spatial filters were performed through multiple beamformers in parallel,so that each signal was obtained independently.Finally,the spoofing interferences were detected according to output of each correlator.After the detection performance of the algorithm was analyzed,the feasibility of the algorithm was verified by MATLAB simulation experiment.