Novel GNSS Anti-Spoofing Technique Using Antenna Array Processing

A novel antenna array-based spoofing defense scheme for the Global Navigation Satellite System (GNSS) is developed in this paper. The basis of the proposed approach is the spatial processing, which can be divided into two successive steps. In the first step, to identify and suppress the spoofing under the noise level, we build a cyclic correlation matrix to provide the direction of arrival (DOA) of the incoming signals. A robust adaptive beamforming process based on eigenspace projection is then designed to eliminate the spoofing in the second step. In particular, the proposed technique is capable of adaptively eliminating spoofing while providing protection to the desired navigation signals. By exploiting the digitised baseband signals, our framework avoids acquiring and tracking all arriving signals, reducing the receiver's computational load. The effectiveness of our anti-spoofing strategy is illustrated by the simulation experiments.