A Digital Beamforming Anti-Jamming Method Based on Signal Eigen-Subspace

In scenarios with high signal-to-noise ratio (SNR), due to the inconsistency of amplitude and phase between array channels, conventional digital beamforming methods cannot effectively constrain the direction of arrival of the desired signal in the process of suppressing interference, and the signal will be suppressed as interference. In this letter, a digital beamforming method based on signal eigen-subspace is proposed to effectively suppress interference and avoid attenuation of the desired signal. At the same time, a method to reduce the complexity of eigen-decomposition is proposed from the perspective of engineering implementation. Finally, the performance of the proposed method is verified and evaluated through simulation and experiments.