针对中、低动态环境下,卫星导航系统跟踪段存在的欺骗式干扰信号的检测问题,提出一种基于载波相位跟踪谱分析的欺骗检测方法。该方法利用跟踪环路鉴相器输出信号的频谱特性与环路中是否存在干扰信号密切相关,通过对鉴相器输出信号进行...针对中、低动态环境下,卫星导航系统跟踪段存在的欺骗式干扰信号的检测问题,提出一种基于载波相位跟踪谱分析的欺骗检测方法。该方法利用跟踪环路鉴相器输出信号的频谱特性与环路中是否存在干扰信号密切相关,通过对鉴相器输出信号进行谱分析,建立欺骗检测模型,实现了欺骗信号检测。仿真结果表明,利用该方法,在干信比大于4 d B时,通过设置合适的判决门限,采用256点以上快速傅里叶变换,在虚警率不超过0.5%的情况下,能获得100%的检测概率,对跟踪段的欺骗信号具有很好的检测效果。展开更多
The BeiDou system(BDS)plays a significant role in people’s lives,but its security is easily affected by spoofing attacks.The radio determination satellite service(RDSS)is a special service of BDS that provides two-wa...The BeiDou system(BDS)plays a significant role in people’s lives,but its security is easily affected by spoofing attacks.The radio determination satellite service(RDSS)is a special service of BDS that provides two-way communication,positioning,and timing services independently of the traditional radio navigation satellite service(RNSS).It can additionally be combined with RNSS to provide a comprehensive RDSS(CRDSS)service.In RDSS,after receiving a signal from the master station,the user needs to send a response signal back to the master station through a satellite.Therefore,the RDSS signal is difficult to spoof.In this study,based on the security feature of RDSS signals,an anti-spoofing method based on CRDSS is proposed to detect and mitigate spoofing attacks,verifying the advantages of the BeiDou system over other satellite navigation systems.展开更多
随着卫星导航系统的快速发展,基于低地球轨道(low earth orbit,LEO)卫星的高精度可信导航已成为当前研究的热点.然而,LEO卫星导航的安全可信问题一直阻碍其大规模应用,基于扩频码和导航电文(spreading code and navigation data based a...随着卫星导航系统的快速发展,基于低地球轨道(low earth orbit,LEO)卫星的高精度可信导航已成为当前研究的热点.然而,LEO卫星导航的安全可信问题一直阻碍其大规模应用,基于扩频码和导航电文(spreading code and navigation data based authentication proposal,SNAP)认证方案在解决上述问题中展现了良好势头.本文的重点是解决SNAP信号的间歇跟踪算法及性能分析,并得到跟踪误差的解析表达式.研究结果表明:由于间歇跟踪导致的误差累积服从高斯分布,其均值与多普勒频移变化率成正比,均方差可等价于载噪比(carrie noise ratio,CNR)的损失,相较载波环,码环受多普勒的影响较小.本文的研究结果为间歇跟踪结构下接收机系统参数设计提供重要理论参考.展开更多
文摘针对中、低动态环境下,卫星导航系统跟踪段存在的欺骗式干扰信号的检测问题,提出一种基于载波相位跟踪谱分析的欺骗检测方法。该方法利用跟踪环路鉴相器输出信号的频谱特性与环路中是否存在干扰信号密切相关,通过对鉴相器输出信号进行谱分析,建立欺骗检测模型,实现了欺骗信号检测。仿真结果表明,利用该方法,在干信比大于4 d B时,通过设置合适的判决门限,采用256点以上快速傅里叶变换,在虚警率不超过0.5%的情况下,能获得100%的检测概率,对跟踪段的欺骗信号具有很好的检测效果。
文摘The BeiDou system(BDS)plays a significant role in people’s lives,but its security is easily affected by spoofing attacks.The radio determination satellite service(RDSS)is a special service of BDS that provides two-way communication,positioning,and timing services independently of the traditional radio navigation satellite service(RNSS).It can additionally be combined with RNSS to provide a comprehensive RDSS(CRDSS)service.In RDSS,after receiving a signal from the master station,the user needs to send a response signal back to the master station through a satellite.Therefore,the RDSS signal is difficult to spoof.In this study,based on the security feature of RDSS signals,an anti-spoofing method based on CRDSS is proposed to detect and mitigate spoofing attacks,verifying the advantages of the BeiDou system over other satellite navigation systems.
文摘随着卫星导航系统的快速发展,基于低地球轨道(low earth orbit,LEO)卫星的高精度可信导航已成为当前研究的热点.然而,LEO卫星导航的安全可信问题一直阻碍其大规模应用,基于扩频码和导航电文(spreading code and navigation data based authentication proposal,SNAP)认证方案在解决上述问题中展现了良好势头.本文的重点是解决SNAP信号的间歇跟踪算法及性能分析,并得到跟踪误差的解析表达式.研究结果表明:由于间歇跟踪导致的误差累积服从高斯分布,其均值与多普勒频移变化率成正比,均方差可等价于载噪比(carrie noise ratio,CNR)的损失,相较载波环,码环受多普勒的影响较小.本文的研究结果为间歇跟踪结构下接收机系统参数设计提供重要理论参考.
