（2015卫星导航）基于双天线载波相位差的卫星导航接收机抗欺骗技术研究

针对欺骗干扰信号难以有效实时模拟真实卫星信号空间分布特性的特点,本文提出了利用双天线载波相位差进行欺骗信号检测的方法。在已知接收机天线阵基线以及姿态条件下,同一路信号在两副天线上表现出的相位差与天线基线长度与信号入射相关。而信号入射角是空间信号的物理传播特性,欺骗干扰源无法通过数字方式改变。以通过卫星星历获取所跟踪卫星的精确位置为先验信息,即可确定真实信号在已知天线阵上的载波相位差,从而实现对欺骗信号的有效检测。本文分析了载波相位差计算的各种误差源,并在此基础上建立了针对欺骗信号的二元假设检验。最后,通过理论分析和仿真实验,验证了本文提出的欺骗信号检测技术的有效性,并得出了天线阵基线越长、入射方位角越小,载波相位差检测技术对欺骗信号的检测性能越优的结论。

Analyses of Carry Phase Difference Detection for Satellite Navigation Receivers Anti-spoofing

A spoofer has no way to simulate the space distribution characteristic of the authentic GNSS signals. In this paper, a detection technique based on carry phase difference is proposed. Knowing the baseline and attitude of the antenna array, the carry phase difference of a signal is only related with the angle of incidence. The precise positions of satellites can be determinate by the ephemeris, and the carry phase difference of the authentic signals can be known and an effective spoofing detection could be conducted. In this paper, all errors of the detection are analyzed, and the multiple hypotheses testing to the spoofing detection is built. In the end, through theoretical analyses and simulation tests, the spoofing detection method proposed in the paper is verified to be effective. The longer baseline of the array and smaller angle of incidence lead to a better spoofing detection performance of the method proposed in this paper.