BDS time spoofing detection method based on the dynamic time warping

The radio navigation satellite system (RNSS) timing has been widely used in crucial power systems. However, the problem of RNSS service vulnerability to interference and spoofing significantly affects its application. The phasor measurement unit can effectively detect timing spoofing that exceeds the maximum allowable error, but there has been less research on small-offset timing spoofing. We propose a joint timing spoofing detection method of the radio determination satellite system (RDSS) and RNSS in BDS for small-offset timing spoofing. The RDSS service uses an authentication mechanism in the master station, making it challenging to be spoofed, and it has the same time and space references as the RNSS service. We obtain the RNSS and RDSS timing signal counts and performs dynamic time wrapping to measure the similarity metric of two-time series as a detection quantity. Then, the proposed method is verified by actual experiments. The experiment results show that the detection probability of the RDSS-assisted method is significantly higher than that of the method only using the RNSS variance. The detection probability of the proposed method can reach 90% at a false alarm probability of 0.1, which verifies the accuracy and reliability of the proposed method.