基于矢量水听器单通道瞬时相位差加权的水下目标测向方法

doi:10.16180/j.cnki.issn1007-7820.2023.10.002

Abstract

Abstract:

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.

Key words: information processing, vector hydrophone, underwater target radiated noise, instantaneous phase difference, low signal-noise rate, underwater target bearing estimation, complex sound intensity, acoustic energy flux

CLC Number:

TN911.6

BAI Xingyu,LIU Mingyu,JIANG Yu,WANG Yiqi,LI Shuai. Underwater Target Direction Finding Method Based on Vector Hydrophone Single Channel Instantaneous Phase Difference Weighting[J].Electronic Science and Technology, 2023, 36(10): 9-14.

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References 19

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Underwater Target Direction Finding Method Based on Vector Hydrophone Single Channel Instantaneous Phase Difference Weighting

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目标信号入射角θ/(°)	常规法		加权法
目标信号入射角θ/(°)	角度/(°)	线谱/Hz	角度/(°)	线谱/Hz
35	37	68	36	62
20	19	62	20	62
15	18	98	16	62

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