This paper reports on the results of a detection performance analysis of a signal quality monitoring (SQM) method used to detect global positioning system (GPS) spoofing. The GPS code tracking was based on a correlation function evaluation of three replicas, namely early, prompt, and late. The receiver synchronized the received code with the local code generated by combining these replicas with a delay lock loop (DLL). In the presence of a GPS spoofer, the correlation was no longer the same because its shape was distorted, leading to a code tracking error. This error relied on the delay and relative phase of the spoofer, and could be used to detect it. In this context, an SQM method based on the fusion of metrics using an OR rule was investigated to detect the spoofer’s presence. Furthermore, closed forms of the optimal thresholds and the probability of detection were derived. The results obtained for different scenarios are presented and analyzed.

本文报告了用于检测全球定位系统（GPS）欺骗的信号质量监视（SQM）方法的检测性能分析结果。GPS代码跟踪基于对三个副本（即早期，提示和晚期）的相关函数评估。接收器将接收到的代码与通过将这些副本与延迟锁定环（DLL）组合在一起而生成的本地代码进行同步。在存在GPS喷洒器的情况下，相关性不再相同，因为其形状会变形，从而导致代码跟踪错误。此错误取决于spoofer的延迟和相对相位，可用于检测它。在这种情况下，研究了使用OR规则基于指标融合的SQM方法来检测欺骗者的存在。此外，得出最佳阈值的封闭形式和检测概率。呈现并分析了针对不同场景获得的结果。