Fast Iterative Interpolated Beamforming for Interference DOA Estimation in GNSS Receivers Using Fully Augmentable Arrays

In this paper, we present an efficient strategy for satellite signal acquisition in the presence of strong interferences. A GNSS receiver equipped with a fully augmentable non-uniform linear array is assumed. The interference directions-of-arrival (DOAs) are estimated using a low-complexity and accurate Fourier-based approach. Interference suppression is then performed by placing nulls in the estimated directions. Using simulated data, the performance of the proposed scheme is compared with that of beamforming, root-MUSIC algorithm, and Minimum Output Power polynomial rooting method in terms of execution time, DOA estimation accuracy, and output signal-to-interference-plus-noise ratio.