一种面向商用接收机的GNSS欺骗干扰源测向方法

A direction finding method of the GNSS spoofer for commercial receivers

随着全球导航卫星系统(global navigation satellite system,GNSS)应用的日益广泛和欺骗攻击威胁的日益加剧,针对商用接收机开展反欺骗研究是十分必要和迫切的.本文提出了一种面向商用接收机的GNSS欺骗干扰源测向方法.该方法利用水平面内运动接收机提供的多普勒(Doppler)观测量和钟漂解算信息构造双差观测量,计算提取了由接收机运动产生的多普勒信息,并利用该信息实现欺骗干扰源测向.本文给出了欺骗源方位角和仰角测量的最大似然估计(maximum likelihood estimation,MLE)方法,推导了克拉美罗下界(Cramer-Rao lower bound,CRLB),分析了影响角度估计性能的因素,并通过外场试验验证了所提方法的有效性.

With the increasing applications of the Global Navigation Satellite System(GNSS)and the rising threat of spoofing attacks in daily life,it is necessary to conduct anti-spoofing research for commercial receivers.In this paper,we propose a direction-finding method of the GNSS spoofer for commercial receivers.This method fully utilizes the Doppler measurements and clock drift information provided by motion receivers in the horizontal plane.The double difference measurement is constructed to extract the Doppler information generated by the receiver’s motion,which is later used to determine the direction of the spoofer.In this paper,the maximum likelihood estimation of the azimuth and elevation of the spoofer is given,and the Cramer-Rao lower bound is derived,with the factors affecting the performance of angle estimation analyzed.We conduct field experiments to estimate the arrival direction of the deception signal broadcast by the helical antenna.The test results show the effectiveness of the proposed method.