GNSS双接收机抗欺骗技术

A GNSS anti-spoofing technique based on dual-receiver

欺骗干扰能使目标接收机得出错误的位置、时间结果,是GNSS应用安全性的一个严重威胁。提出一种利用两个接收机伪距测量值单差的抗欺骗方法,利用方差分析技术推导基于伪距单差的欺骗信号最优检测量,并分析检测量的统计特性。经分析,接收机噪声、接收机基线长度和卫星个数等参数对检测性能的影响较大;在接收机噪声和卫星个数未知的情况下,可以通过增大接收机基线长度来提高检测性能。仿真结果表明,当接收机间的基线长度为10 m时,0.01虚警概率下,欺骗信号的检测概率可达98%。

The spoofing interference can mislead target receiver in resulting in wrong position and time,which is a serious threat to the security of GNSS applications. An anti-spoofing method using the pseudo-range single-differences of two receivers was proposed. Using the variance analysis technique,the optimal spoofing detection variable based on the pseudo-range single-differences was deduced and the statistical character of the detection variable was analyzed. After analyzing,the parameters such as the receiver noise,the receiver baseline,and the satellite number have a large influence on the detection performance; as the receiver noise and satellite number are uncertain,the detection performance can be improved by increasing the length of baseline. When the length of baseline is 10 meters,the simulation results illustrate that the spoofing detecting probability is up to 98% if the false alarm rate is 0. 01.