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Robust adaptive beamforming method based on mainlobe shape-preserving

Because of the effect of the space local scattering, when two non-coherent desired signals are incident in the mainlobe of the beampattern at the same time, the beampattern of the conventional adaptive beamformer can form a null in one of the desired signal directions, which will further destroy the integrity of the mainlobe and lead the output signal-to-interference-plus-noise ratio (SINR) to drop significantly. In response to this, a robust adaptive beamforming method based on the mainlobe shape-preserving is proposed in this paper. The diagonal loading technique is used to process the covariance matrix of the proposed method and a simple and closed-form expression for the loading factor can be obtained by constructing the optimization model of maximizing the output SINR of the one desired signal under the condition that the output SINR of the another desired signal is not less than a certain value. Simulation results have demonstrated the validity of the proposed method.