利用矢量跟踪环路的欺骗干扰检测与抑制方法

Spoofing Detection and Suppression Method by Utilizing Vector Tracking Loop

欺骗干扰的信号模型与真实卫星信号相似,具有很强的隐蔽性。近年来欺骗干扰不断威胁GPS系统因此受到了国内外学者的广泛关注。生成式欺骗干扰的延迟和功率具有可控性和变化性,因此隐蔽性和危害性更强。针对该问题,本文在欺骗干扰来向与真实卫星信号来向未知的前提下,结合阵列天线技术与矢量跟踪环路,提出一种基于矢量跟踪环路的欺骗干扰检测和抑制方法。该方法首先根据矢量跟踪环路的预测参数重构基于远滞后码的参考信号;其次根据接收信号与参考信号的相干累加结果构造欺骗干扰检测模型;然后根据阵列接收信号与参考信号的相干累加结果估计协方差矩阵;最后根据协方差矩阵中最大特征值对应的特征向量估计欺骗信号的特征向量,并根据该特征向量构造正交投影矩阵抑制欺骗干扰。理论分析和仿真实验得出了本文提出的算法具有较好的抗欺骗干扰性能。

Spoofing is hidden because its signal model is similar to real satellite signals＇. In recent years,spoofing has been a threat to GPS system and has been attracted extensive attention of scholars in the world. Besides,the generated spoofing signals＇ delay and power are controllable and variable,so they have stronger concealment and harmfulness. To improve the receiver＇s anti-spoofing performance,array antenna technology is combined with vector tracking loop,and spoofing detection and suppression method based on vector tracking loop is present in this paper. Firstly,this paper construct reference signal based on VL according to despread-respread algorithm. Secondly,spoofing detection mode is established according to integration results of received signals and reference signal. Thirdly,covariance matrix is estimated according to coherent integration results of array received signals and reference signal. Fourthly,spoofing signals＇ eigenvector is estimated according to eigenvector of the largest eigenvalue,and orthogonal projection is constructed based on spoofing signals＇ eigenvector to suppress spoofing. Theoretical analysis and simulation experiments verify that this spoofing detection and suppression method by utilizing vector tracking loop has considerable anti-spoofing performance.