Distortionless Blind Beamformer for Interference Suppression in GNSS Antenna Array Receiver

The Space-time adaptive processing method (STAP) used in array antenna GNSS receiver for interference suppression may induce pseudo-range measurement bias, which is one of the main error sources for precise application. In this paper, a distortionless blind beamformer for interference suppression is proposed. Firstly, subspace projection algorithm is employed for interference suppression. Secondly, the direction of the satellite signal is estimated by the sparse recovery method after de-spreading process. Furthermore, a space-time beamformer is constructed using the estimated direction information, which can achieve distortionless measurement and signal enhancement. Extensive results on simulation experiments demonstrate that the proposed method can achieve interference suppression, and the bias induced by space-time filtering can be reduced effectively.