Frequency Domain Minimum Power Undistorted Beamforming Algorithm Based on Full Matrix Acquisition

In order to solve the problem that the performance of the minimum power distortionless response (MPDR) beamforming algorithm is reduced due to the inaccurate autocorrelation matrix information when imaging multiple damages, a minimum power undistorted beamforming algorithm in frequency domain based on full matrix acquisition was proposed. According to the characteristic of linear independence of the data collected by the full matrix, the information of autocorrelation matrix is increased, and the mechanism of interference suppression in imaging is analyzed theoretically. Finally, the experimental platform was set up to carry out the double damage imaging experiment, and the experimental results demonstrated that the MPDR algorithm based on full matrix acquisition detection scheme had good performance in the case of double damage. Compared with the frequency-domain full-focus and superimposed MPDV imaging methods, this method can effectively improve the imaging resolution and suppress the influence of side lobes, and has some practical application significance.