دانلود رایگان مقاله تشخیص اسپوفینگ GNSS: تحلیل نظری و عملکرد متریک آزمون نسبت در آسمان باز

Abstract

Nowadays more and more applications rely on the information provided by Global Navigation Satellite Systems (GNSSs), but the vulnerability of GNSS signals to interference, jamming and spoofing is a growing concern. Among all the possible sources of intentional interference, spoofing is extremely deceptive and sinister. In fact, the victim receiver may not be able to warn the user and discern between authentic and false signals. For this reason, a receiver featuring spoofing detection capabilities might become a need in many cases. Different types of spoofing detection algorithms have been presented in recent literature. One of the first, referred to as Ratio Metric, allows for the monitoring of possible distortions in the signal correlation. The effectiveness of the Ratio Test has been widely discussed and demonstrated, while in this paper we analyze its performance, proposing a mathematical model that is used to assess the false alarm and detection probabilities.

5. Conclusions

and future work This paper analyzes the performance of the Ratio Test when it is used as spoofing detector. The Ratio Test is a known metric, that is employed in GNSS signals quality monitoring to detect distortions of the signal correlation. In this paper we introduced a mathematical model used to evaluate the Ratio Test performance, in terms of probability of detection and probability of false alarm. After recalling the main characteristics of the detection strategy, the paper reports the mathematical analysis and derives the ROC curves. Even if the proposed model is valid for high values of C/N0, that is a condition encountered in open sky scenarios, it is valuable to predict the detector performance. The ROC curves are the outcome of the theoretical model and need to be validated through proper simulation campaigns. Promising results have already been achieved, obtaining simulated ROC curves that fit the theoretical ones. Detailed study of this aspect will be the focus of authors’ future activities on this work.