Blind Spoofing Detection for Anti-Jamming Multiantenna GNSS Receivers

Multiantenna global navigation satellite system (GNSS) receivers with adaptive array processing are widely used in harsh jamming environments. However, spoofing is still a security threat to multiantenna systems because it can go unnoticed by existing array anti-jamming techniques. Direction-of-arrival (DOA) estimation is one possible technique to identify a spoofing attack. However, such methods are expensive to implement due to the need for array calibration. In this article, a simple spoofing detection method with anti-jamming capability is proposed. This method can be operated without any supporting information or sensors, thanks to its blind characteristics. Specifically, multichannel anti-jamming processing is first used to suppress jamming, and then an extended double difference carrier phase (DDCP) model is established. Based on the above, a test statistic for spoofing detection is derived using the generalized likelihood ratio test (GLRT) approach. The detection performance is analyzed theoretically and the detection threshold is derived. Furthermore, methods to reduce false alarms are also discussed. Finally, several real-world experiments are performed to verify the effectiveness of the proposed method.