Michalopoulou Zoi-Heleni, Gerstoft Peter
Department of Mathematical Sciences, New Jersey Institute of Technology, Newark, New Jersey 07102, USA
Marine Physical Laboratory, Scripps Institution of Oceanography, La Jolla, California 92093-0238,
J Acoust Soc Am. 2016 Jul;140(1):EL125. doi: 10.1121/1.4958983.
In passive fathometer processing, the presence of wavelets in the estimate of the medium's Green's function corresponds to the location of reflectors in the seabed; amplitudes are related to seabed properties. Bayesian methods have been successful in identifying reflectors that define layer interfaces. Further work, however, revealed that phase shifts are occasionally present in the wavelets and hinder accurate layer identification for some reflectors. With a Gibbs sampler that computes probability densities of reflector depths, strengths of the reflections, and wavelet phase shifts, the significance of phase shift modeling in successful estimation of reflectors and their strengths is demonstrated.
在被动测深仪处理中，介质格林函数估计值中的小波的存在对应于海床中反射体的位置；振幅与海床特性相关。贝叶斯方法已成功识别出定义层界面的反射体。然而，进一步的研究表明，小波中偶尔会出现相位偏移，这会妨碍对某些反射体进行准确的层识别。通过一个计算反射体深度、反射强度和小波相位偏移概率密度的吉布斯采样器，证明了相位偏移建模在成功估计反射体及其强度方面的重要性。
