由正入射遥测海底介质参数方法初探

通过数值模拟计算发现，对于分层有吸收海底，在层厚已知的条件下，除最下面的介质以外．有可能利用垂直入射的脉冲声波遥测各层的密度、声速与吸收系数。此法的要点是，根据入射波和层参数的假设值算得反射信号，与实际反射信号比较；然后改变参数再作计算，直到误差最小为止．此时对应的层参数即为介质参数值实际的估计值。指出根据这种方法有可能实现以自适应方法遥测分层海底的介质参数。

A PRELIMINARY STUDY ON THE REMOTE MEASURING OF SEA BOTTOM PARAMETERS BY NORMAL INCIDENCE

It is found through the numerical simulation that for an absorptive stratified sea bottom, the density, sound speed and absorption coefficient of each layer can be estimated by remote measuring using a normal incident sound pulse provided the layer thicknesses are known. The main point of this method is as follows. A reflected signal is computed from the incident wave and the assumed values of the layer parameters and is then compared with the actual reflected signal. The computation is then repeated after changing the parameters until the error is minimum and the parameter values can be regarded as the estimates of the actual parameters.This method may lead to the remote measuring of stratified sea bottom parameters using an adaptive algorithm.