基于模式能量比的海底声衰减系数反演

Inversion of seabed attenuation based on modal ratios

简正波的分离性能对简正波频散曲线、模式能量比等物理量的提取至关重要,这些物理量可以用来反演海底地声参数.该文分析了短时傅里叶变换和warping变换两种方法在简正波分离上的性能差异,并利用该两种方法提取模式能量比来反演海底声衰减系数.仿真实验和2018年冬季黄海验数据处理表明,warping变换在简正波分离上具有较大的优势,尤其是在近距离接收上.

Modal resolution is critical to the extraction of the dispersion curves and modal ratios which are often used in the inversion of the seabed geoacoustics parameters.In this paper,two ways of modal resolutionshort time Fourier transform(STFT)and warping transform are compared in separating modes,and then the extraction of modal ratios,which are used in the inversion of the seabed attenuation.These two methods are applied to the simulated data and experimental data collected in the Yellow sea of China during in the winter of 2018.The results show that the warping technique has advantage over the STFT in modal resolution,especially in the close receiving range.