Research On Inversion For Sound Speed Profile In Stratified Motion Media

Object detection, locating and tracking are all practical and significant topic inthe field of underwater acoustics. In order to research these problems， marineenvironmental parameters need be known firstly in which the sound speed profile isone of the most important parameters. Know from the former research, the property ofray traveling in underwater current field is discussed in this article, and the inversionof sound speed profile in the motion media is researched.An eigenray model in motion media is induced according to the ray theory in thisarticle. It is discussed that the flow velocity of media could influence the propagationof eigenray. And it is verified that the model could compute the eigenray trace andtraveling time in flowing layer media by the simulation.The inversion method of sound speed profile in shallow flowing water issimulated and analyzed in which the eigenray model, EOF of sound speed profile andGene Algorithm are employed. In order to verify the availability in practice, anexperiment is conducted in certain region of East Sea. It is shown that the Machnumber of motion media will effect on the accuracy of eigenray searching obviouslyin some condition. And the inversion method in this article could be used to invertsound speed profile of the stratified motion media whose accuracy will be better thanthe model in static media under some condition.