一种基于多基线载波相位差测量的欺骗干扰检测方法

由于卫星导航信号到达地面的信号功率较低,且民用部分信息公开,极易受到欺骗干扰信号的影响,从而导致接收机解算出错误的位置、速度或时间.针对传统的欺骗干扰检测与抑制方法不能对欺骗干扰进行测向的问题,提出了一种基于阵列多天线接收信号的载波相位差进行欺骗信号检测与抑制的方法.该方法能够在缺少先验知识的条件下,借鉴相关干涉仪测向原理,利用不同阵元接收的同一信号的载波相位差构建观测量,实现接收机捕获信号的波达方向估计,通过与星历解算的卫星方向进行对比可实现欺骗干扰的检测与识别.仿真结果表明,该方法能够实现针对不同卫星的多个欺骗信号的波达方向识别,识别精度较高,具有较好的欺骗干扰检测效果,并且该方法对各种导航系统均适用.

A Spoofing Detection Method Based on Multi-baseline Carrier Phase Difference Measurement

Due to the low power of satellite navigation signal reaching the ground and the public information of its civil part, it can be easily affected by spoofing, which leads to the wrong position, speed or time information calculated by the receiver. Aiming at the problem that the traditional spoofing detection and suppression methods cannot detect the direction of spoofing, this paper proposes a method based on the carrier phase difference of received signals of multi-antenna array to detect and suppress spoofing. With no prior knowledge, the proposed method can use the direction finding principle of corre-lation interferometer for reference, construct the observation measurement by exploiting the carrier phase difference of the same signal received by different elements, realize the DOA estimation of the receiver captured signal, and complete the detection and identification of spoofing by comparing it with the satellite direction calculated by ephemeris. The simulation results show that the method can realize the DOA recognition of multiple spoofing for different satellites with high recognition accuracy and good detection effect and is applicable to all kinds of navigation systems.