Abstract:

Antenna arrays with space-time adaptive processing (STAP) have been widely used in the global navigation satellite system (GNSS) to suppress interference in spatial domain as well as temporal domain, its performance depends on digital beamforming algorithms. A joint adaptive beamforming algorithm is proposed, which produces nullings in the directions of interference while simultaneously maximizing the carrier-to-noise ratio (C/N₀) of post-correlation signals. Firstly, the interferences are cancelled by using subspace orthogonal projection. Then, the maximum C/N₀ constraint algorithm is employed to enhance the post-correlation signal. Simulations demonstrate that using the proposed adaptive algorithm, STAP can effectively suppress the interferences and improve the capturing performance of GNSS signals.