摘要
对于分层浅海，当海底散射是形成混响的主要散射源时收发合置混响的平均强度可由一简洁的简正波表式计算，它依赖于平面波的海底反射和散射系数。利用随机反演理论（高斯一马尔可夫原理）和多次选代的方法可以由混响强度反演得到对应于各号简正波掠角的海底反射和散射系数。对负跃层浅海作了混响反演的数值模拟，得到较好的结果。文中讨论了提高反演精度和选代收敛性的问题。
A simplified shallow water bottom reverberation model is obtained on the basis of the separable scattering model and the normal mode method combined with ray--mode analogies.The forward problem is considered linearizable' The bottom reflection and scattering coefficients at modal grazing angles are delived from the average reverberation intensities in terms of the stochastic inverse. The parameters derived from a numerical example are very close t+o the true values except for those corresponding to higher normal modes which decay fast in the channel. To avoid divergence in inversion the initial reference Parameters can be obtained from the inversion of a simplified three parameter model, which is more robust but less accurate.
出处
《声学学报》
EI
CSCD
北大核心
1996年第4期565-572,共8页
Acta Acustica
基金
国家自然科学基金
