GLRT-Based Spacetime Detection Algorithms Via Joint DoA and Doppler Shift Method for GNSS Spoofing Interference

The critical applications of global navigation satellite system in the field of national defense and security are seriously limited by the susceptibility of its system to spoofing interference. At present, The spoof interference detection algorithms commonly utilize temporal consistency and other time-frequency information, as well as angle resolution and other spatial information, which the types of referenced information are limited and singular. In this article, a spacetime spoofing interference detection algorithm is proposed, which simultaneously combines both temporal and spatial information. A joint generalized likelihood ratio test framework involving relative Direction of Arrival (DoA) and Doppler shift difference is established, and the characteristics of inconsistent incoming angular angle and similar Doppler shift of spoofing signals are fully utilized. Experimental findings indicate that the proposed algorithm can effectively detect spoofing in scenarios involving a limited number of spoofed satellites. Moreover, the detection probability has been reached 99% compared with the traditional DoA estimation technique and metric combination technique, which verifies the efficacy and dependability of the proposed approach.