惯导辅助的三元天线阵欺骗干扰检测算法

Detection of spoofing threats by inertial assisted three elements antenna

对欺骗信号的到达角检测是目前最有效的欺骗检测方法之一,常用的到达角检测又分为载波相位单差和载波相位双差检测。载波相位单差检测技术不能应用于运动载体,载波相位双差技术对多阵元发射的欺骗信号或单路欺骗信号失效。针对该问题,提出一种惯导辅助的三元天线阵欺骗干扰检测技术,该算法主要应用于车辆运动载体,运动载体只需在某一时间段内运动一段距离即可利用该算法进行欺骗干扰检测。该算法对多阵元发射的欺骗信号或单路欺骗信号都同样有效。通过理论分析和仿真实验验证了所提方法的有效性,并得出天线阵基线长度越长,运动位移越大、欺骗源距离接收天线越近,信号入射方向与天线位移方向夹角越接近90°,该方法检测性能越优的结论。

DOA （direction-of-arrival） discrimination is one of the most effective spoofing detection methods. There are two forms of DOA, one is the carrier phase single difference and the other is the carrier phase double difference. However, the carrier phase single difference cannot be used in the motion vector, and the carrier phase double difference will be ineffective in detecting single spoofing signal or multi-elements spoofing transmitter. In order to solve this problem, a method based on the inertial assisted three elements antenna was introduced. This method was applied to motion vectors, the motion vectors using this method can detect the spoofing only by means of moving a distance during a certain time. This method not only can be effective for several spoofing signals from the same antenna, but also can detect single spoofing signal or multi-elements spoofing transmitter with strong ability. The proposed spoofing detection method was verified to be effective through theoretical analyses and simulation tests. The results indicate that the longer the displacement distance of the receiver antenna is, the better the spoofing detection performance of the proposed method is; the closer to spoofer from the receiver antenna is, the better the spoofing detection performance of the proposed method is; the more vertical between DOA and antenna displacement direction is, the better the spoofing detection performance of the proposed method is.