GNSS Spoofing Detection With Using Linear Array

As the the spoofing interference can result in serious consequences, the GNSS spoofing detection problem is a hot research topic now. To detect the spoofing signals, which coming from different emitting sources, an anti-spoofing method was proposed with using linear array. The method recognizes spoofing signal by comparing the carrier-phase single difference (CPSD) measurements, which is calculated between different array elements, with the expect CPSD estimations. As the attitude of the linear array is assumed to be unknown, it has to be estimated in the process of estimating expect CPSD. The spoofing decision variable was deduced based on the differences between CPSD measurements and expectations. And the statistical characterization of the variable was analyzed as well. In the last, the spoofing detection performance was evaluated by Monte-Carlo simulations. The simulation results illustrated that no matter how many emitting sources, as long as there is one spoofing signal that the angle between its incident direction and corresponding authentic one is larger than 5 degrees, it will be detected effectively by the proposed method with a 3 elements array.