Reshaping pattern under mainlobe interference suppression with combinating diagonal loading and linear constraints

For the problem of beam direction offset that caused by mainlobe interferences suppression based on blocking matrix, apattern reshaping method is proposed which is based on the combination of diagonal loading and linear constraints. By analyzing the blocking matrix preprocess, the problem of beam direction offset is caused by the covariance matrix mismatch in the adaptive beamforming algorithm. The diagonal loading method is used to correct the beam direction, and the linear constraints is used to certify the beam pattern nulling in the interference direction, so the expected adaptive beamforming is obtained.Simulation results show the effectiveness of the proposed method, and it is insensitive to the value of load level, which means it is easy to choose.