Spoofing Interference Suppression for GNSS Based on Estimating Steering Vectors

Abstract

The paper proposes a spoofing interference suppression algorithm for multiple spoofing interferences existing simultaneously. First, the signals which received from the reference antenna array are captured. The information about visible satellite signals’ Doppler frequency and code delay are acquired. Using these information, we can reconstruct the visible satellite signals. Then, the visible satellite signals’ steering vectors are estimated by calculating cross-correlation between the estimated visible satellite signals and the antenna array received signals. Utilizing the normalized cross-correlation coefficients of the visible satellite signals’ steering vectors to detect spoofing interference and its steering vectors. Final, the proposed algorithm constructs an orthogonal projection matrix based on spoofing interference’ steering vectors. Spoofing interference are suppressed by utilizing the constructed orthogonal projection matrix. The proposed novel spoofing interference suppression algorithm can simultaneously suppress multiple spoofing interference, which does not need to know the array manifold in advance and the DOAs (Direction of Arrival) of satellite signals and spoofing interference.