INFERENCE OF SEA-BOTTOM IMPEDANCE PROFILE FROM THE REFLECTION OF NORMALLY INCIDENT PLANE SOUND WAVES

The inverse method to infer the profiles of acoustical parameters under the sea-bottom from exactsolutions of the wave equation is generally not applicable to situations where discontinuity exists in theacoustical impedance profile.However,the ray approximation is still effective,and satisfactory results havebeen obtained under some practical circumstances. In this paper a scattering-inverse method is presented based on the equithickness(measured in thepropagation time)division of the subbottom medium.The program is capable of judging the existence ofmultiple reflectio is and elimnating their influence.The problem of the occurence of pseudo boundaries arising from multiple reflections and the computation errors caused by them have been preliminarily solved.