Nulls control method based on semidefinite programming

The conventional adaptive beamforming algorithm can aim at the direction-of-arrival of jammer automatically. However when the antenna platform vibrates or the interference moves quickly, the mismatching between adaptive weight and data occurs due to the perturbation of the interference location. To solve the problems, a nulls control method based on semidefinite programming was presented to widen nulls of the adaptive antenna array. The method provides an improved robustness against the interference angle shaking and suppresses the interference signals and minimizes the mean output array SINR. Simulation results demonstrate its validity.