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In order to solve the problem of poor target direction finding accuracy of conventional complex acoustic intensity method under the condition of low SNR(Signal-to-Noise Ratio), an underwater target direction finding method based on vector hydrophone single channel instantaneous phase difference weighting is proposed in this study. According to the characteristics that the instantaneous phase difference corresponding to the line spectrum frequency unit of underwater target is relatively stable and the instantaneous phase difference corresponding to the background noise frequency unit changes randomly, the variance weighting of the instantaneous phase difference of each channel frequency unit of vector hydrophone is carried out to enhance the SNR gain of the line spectrum and effectively restrain the energy interference of the background noise, thus realizing the high precision direction finding of underwater target. Simulation analysis and experimental verifications show that the direction finding accuracy of the proposed method is 15.8% higher than that of the conventional complex acoustic intensity method under the condition of low SNR at -20~10 dB. [ABSTRACT FROM AUTHOR]

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