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  

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

作　　者：白兴宇 刘明禹 姜煜 王祎奇 李帅 BAI Xingyu;LIU Mingyu;JIANG Yu;WANG Yiqi;LI Shuai(School of Electronic Information,Hangzhou Dianzi University,Hangzhou 310018,China)

机构地区：[1]杭州电子科技大学电子信息学院,浙江杭州310018

出　　处：《电子科技》2023年第10期9-14,共6页Electronic Science and Technology

基　　金：国家自然科学基金(61871163);浙江省公益技术项目(GF21F010010)。

摘　　要：针对在远程低信噪比条件下常规复声强方法目标测向精度较差的问题,文中提出了一种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。该方法根据水下目标线谱频率单元对应瞬时相位差相对稳定以及背景噪声频率单元对应瞬时相位差随机变化的特点,对矢量水听器各通道频率单元进行瞬时相位差的方差加权,增强了线谱信噪比增益并有效抑制了背景噪声的能量干扰,实现了对水下目标的高精度测向。仿真分析和实验验证了文中所提方法在-20~10 dB的低信噪比条件下的测向精度比常规复声强法平均提高15.8%。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.

关 键 词：信息处理 矢量水听器 水下目标辐射噪声 瞬时相位差 低信噪比 水下目标方位估计 复声强器 声能流 

分 类 号：TN911.6[电子电信—通信与信息系统]