Research on DOA of weak targets under strong interference based on broadband signal

Under complex marine background environmental conditions, how to detect weak targets in strong interference background has always been a difficult problem in the field of underwater acoustic detection. A DOA method for weak targets under strong interference based on broadband signal is proposed. Based on the detection of strong interfering targets by the broadband MUSIC algorithm, a covariance matrix was generated to suppress the strong interfering targets. By using this covariance matrix for broadband power spectrum beamforming, weak target detection and azimuth estimation can be achieved. The simulation results show that this method can effectively detect weak targets under strong interference of broadband signal.