Spoofing is a kind of deliberate interference that aims to manipulate global navigation satellite system (GNSS) receivers into counterfeit position solutions. Conventional anti-spoofing methods are implemented prior to the calculation of the position solution, depending on the specific spoofing attack mechanisms. The paper presents a spoofing detection and mitigation method implemented in the position domain. The proposed method projects the correlograms of the visible satellites to a position-clock bias domain to construct the position domain projected correlogram. P(Y) code signatures retrieved from a reference station receiver are used to identify the counterfeit position solution and remove it from the victim receiver. Compared with the conventional single-channel spoofing detection technique, the proposed anti-spoofing method is more robust against thermal noise by combining the energy from multiple satellites. Detailed mathematical derivation of the statistical characteristics of this method is presented. Its effectiveness is validated using a realistic dataset generated by a Spirent GNSS simulator and NordNav wideband front-end. Results show that the proposed algorithm is capable of not only detecting a spoofing attack but also removing the spoofing effect from the victim receiver.

中文翻译：

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使用双接收机直接定位在欺骗下恢复真实的全球定位系统 L1 信号

欺骗是一种故意干扰，旨在将全球导航卫星系统 (GNSS) 接收器操纵为伪造的位置解决方案。传统的反欺骗方法是在计算位置解之前实施的，具体取决于具体的欺骗攻击机制。本文提出了一种在位置域中实现的欺骗检测和缓解方法。所提出的方法将可见卫星的相关图投影到位置时钟偏差域以构建位置域投影相关图。从参考站接收器检索到的 P(Y) 代码签名用于识别伪造位置解决方案并将其从受害接收器中删除。与传统的单通道欺骗检测技术相比，通过结合来自多颗卫星的能量，所提出的反欺骗方法对热噪声更加鲁棒。详细介绍了该方法的统计特性的数学推导。其有效性通过 Spirent GNSS 模拟器和 NordNav 宽带前端生成的真实数据集得到验证。结果表明，所提出的算法不仅能够检测欺骗攻击，而且能够消除受害者接收器的欺骗效应。