运动目标低频矢量宽带谱干涉结构及其应用研究

随着安静型技术的飞速进步,舰船和潜艇的辐射噪声总源级越来越低,但其低频成分很难消除。推导了低频矢量声场双曲线方程形式的声场干涉条纹方程,建立了双曲线参数与目标运动参数的关系。分别利用射线理论和波动理论模拟了低频声场,计算了运动目标声压和水平、垂直振速的干涉谱图,采用短时傅里叶变换与霍夫变换结合的方法对干涉结构图进行处理,估计舰船目标的运动参数。仿真结果表明,利用运动目标的低频矢量宽带干涉谱可以有效估计出目标的运动参数,同时,垂直振速的干涉谱图参数估计结果较前两种谱图误差小。

Modeling and application of moving target's vector broadband interference spectrum of low frequencies

With the development of quiet techniques, the radiated noise of submarines and ships is greatly reduced, but the low frequency components of the radiated noise are still hard to be eliminated. The sound field interference stripes in the form of hyperbolic equations are derived and the relationship between the hyperbolic parameters and target mo- tion parameters is established. The ray model and normal wave model are used individually to represent the low fre- quency acoustic field in shallow water, and the moving target＇s interference spectra of sound pressure, horizontal velocity and vertical velocity are given. Short-Time Fourier Transform and Hough Transform are used to extract ship （target） motion parameters from the interference spectra. Simulations show that the interference spectrum of the vertical velocity outperforms others.